EN IEC 60730-2-9:2026
(Main)Automatic electrical controls - Part 2-9: Particular requirements for temperature sensing controls
- Abstract
This clause of Part 1 is replaced by the following:
This document applies to temperature sensing controls
– for use in, on, or in association with equipment for household appliance and similar use, including equipment for heating, air-conditioning and similar applications. The equipment can use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof.
NOTE 1 Throughout this document, the word "equipment" means "appliance and equipment" and "controls" means "temperature sensing controls".
– for building automation within the scope of ISO 16484 series and IEC 63044 series (HBES/BACS);
EXAMPLE 1 Independently mounted temperature sensing controls, controls in smart grid systems and controls for building automation systems within the scope of ISO 16484-2.
– for equipment that is used by the public, such as equipment intended to be used in shops, offices, hospitals, farms and commercial and industrial applications;
EXAMPLE 2 Controls for commercial catering, heating and air-conditioning equipment.
– that are smart enabled controls;
EXAMPLE 3 Smart grid control, remote interfaces/control of energy-consuming equipment including computer or smart phone.
– that are AC or DC powered controls with a rated voltage not exceeding 690 V AC or 600 V DC;
– used in, on, or in association with equipment that use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof;
– utilized as part of a control system or controls which are mechanically integral with multifunctional controls having non-electrical outputs;
– using NTC or PTC thermistors and to discrete thermistors, requirements for which are contained in Annex J;
– that have electrical circuits and control circuits which are, for example, operated by bimetals, magnet coils, memory metals, pressure elements, temperature-sensitive
expansion elements or electronic elements.
– as well as manual controls when such are electrically and/or mechanically integral with automatic controls.
NOTE 2 Requirements for manually actuated mechanical switches not forming part of an automatic control are contained in IEC 61058-1-1.
This document applies to
– the inherent safety of automatic electrical controls, and
– functional safety of temperature sensing controls and safety related systems,
– controls where the performance (for example the effect of EMC phenomena) of the product can impair the overall safety and performance of the controlled system,
– the operating values, operating times, and operating sequences where such are associated with equipment safety and to the testing of automatic electrical temperature sensing control devices used in, or in association with, equipment,
EXAMPLE 4 Boiler thermostats, fan controls, temperature limiters and thermal cut-outs.
– electrical safety of temperature sensing controls with non-electrical outputs such as refrigerant flow and gas controls,
– single-operation devices as defined in this document.
This document specifies the requirements for construction, operation and testing of automatic electrical controls used in, on, or in association with an equipment.
This document does not
– apply to automatic electrical temperature sensing controls intended exclusively for industrial process applications unless explicitly mentioned in the relevant part 2 or the equipment standard. However, this document can be applied to evaluate automatic electrical controls intended specifically for industrial applications in cases where no relevant safety standard exists.
– take into account the response value of an automatic action of a control, if such a response value is dependent upon the method of mounting the control in the equipment. Where a response value is of significant purpose for the protection of the user, or surroundings, the value defined in the appropriate equipment standard or as determined by the manufacturer will apply.
– address the integrity of the output signal to the networ
- Status
- Published
- Publication Date
- 02-Jul-2026
- Technical Committee
- CLC/TC 72 - Automatic controls for household use
- Current Stage
- 6060 - Document made available - Publishing
- Start Date
- 03-Jul-2026
- Due Date
- 31-Dec-2025
- Completion Date
- 03-Jul-2026
EN IEC 60730-2-9:2026 is a CENELEC European Standard for automatic electrical controls with temperature sensing functions. It specifies particular requirements for the construction, operation and testing of thermostats, temperature limiters, thermal cut-outs and single-operation devices used in appliances, building automation and similar equipment. The standard is aimed at manufacturers, test laboratories, certification bodies, quality teams and equipment designers who need a common basis for selecting and verifying these controls.
What does EN IEC 60730-2-9:2026 specify?
EN IEC 60730-2-9:2026 gives the Part 2-9 requirements for temperature sensing controls and is used together with EN IEC 60730-1. The document adds to, modifies or replaces the corresponding Part 1 clauses so that the general automatic-control rules become specific requirements for temperature sensing applications.
The scope covers controls for household and similar equipment, including heating and air-conditioning equipment, equipment used by the public, building automation within HBES/BACS, smart-enabled controls, AC or DC powered controls up to the stated voltage limits, and controls used with thermistors and other temperature sensing elements. It also covers manual controls when they are electrically and/or mechanically integral with automatic controls.
The document excludes automatic electrical temperature sensing controls intended exclusively for industrial process applications unless a relevant Part 2 or equipment standard explicitly mentions them. It also does not use mounting-related response values as a general basis for the control if that response depends on how the control is installed, and it does not deal with network output signal integrity unless that has been assessed as part of the control system.
The document is organized in the usual IEC Part 1 plus Part 2 format:
- clauses 1 to 26 cover scope, references, terms, general requirements, technical information, safety, construction, tests, endurance and EMC
- Annex G, H, J, BB, CC and DD are normative
- Annex Q, R, S, T, AA and EE are informative
| Annex | What it covers |
|---|---|
| G | Resistance to heat, fire and tracking tests |
| H | Functional safety and additional information requirements |
| J | Thermistor elements and controls using thermistors |
| Q | Regional differences for CENELEC member countries |
| R | National differences for the United States |
| S | National differences for Japan |
| T | National differences for Canada |
| AA | Maximum manufacturing deviation and drift |
| BB | Time factor |
| CC | Number of cycles |
| DD | Controls for use in agricultural confinement buildings |
| EE | Guide to the application of temperature sensing controls |
What are the key requirements of EN IEC 60730-2-9:2026?
EN IEC 60730-2-9:2026 is mainly about safe temperature control behavior, declared operating values and type testing. The most practical part of the document is that it tells the manufacturer what must be declared, what must be tested, and which extra tests apply to specific control types and applications.
How the Part 2-9 rules work with Part 1
Clause 1 and the foreword make clear that EN IEC 60730-2-9:2026 supplements EN IEC 60730-1. If Part 2-9 says addition, modification or replacement, the corresponding Part 1 requirement is adapted accordingly. If a Part 1 subclause is not mentioned, that Part 1 subclause applies as written.
In practice, this means a user of the standard has to read the two parts together. A control cannot be assessed only against Part 2-9 if the base requirement is in Part 1.
What must be declared about the control
Clause 5 and Table 1 require technical information to be declared for a number of control characteristics, and Table H.1 adds more items for functional safety and EMC-related assessment. Important declarations include maximum sensing element temperature, time factor, SOD reset temperature, number of cycles, minimum current for a test, ambient temperature limits, and the output condition after operation for certain control types.
This matters because the standard uses declared values as the basis for testing and selection. Buyers and test engineers need these declarations to decide whether a control fits the appliance, the installation conditions and the safety function.
Which control types and behaviors are covered
Clause 3 defines the key temperature sensing control types used in the document, including room thermostats, boiler thermostats, voltage maintained thermal cut-outs, agricultural thermostats and the two kinds of SOD. The standard also covers type 1 and type 2 actions, plus special actions such as push-and-turn, pull-and-turn, and several trip-free or safety-related action types in clause 9.
This is important in practice because the action type determines how the control is expected to operate, reset or stay latched after operation. For a designer, the chosen action type drives the mechanical design, the reset mechanism and the control’s role in the safety chain.
What constructional and safety tests apply
Clauses 6 to 15 and 20 to 26 cover the safety backbone of the standard: protection against electric shock, earthing, terminals, creepage and clearance, component behavior, moisture and dust resistance, electric strength, heating, endurance, mechanical strength, resistance to heat/fire/tracking, corrosion, EMC emission and immunity, and abnormal operation tests.
For controls with liquid metal parts, clause 20.102 adds special mechanical and pressure-related tests. For non-bimetallic SODs, clause 9.1.102 and clause 19.15.106.2 add material, ageing and operating tests that reflect their one-time protective role. For voltage maintained thermal cut-outs, clause 16.4.101 and clause 19.15.105 address the thermal and reset behavior tied to supply voltage.
Which special performance checks are important
Clause 9.101 and Annex BB define the time factor and the test methods used to verify it. Clause 19.101 gives the type 2.P cycling test, including thermal cycling, two-bath and temperature-change methods. Annex CC sets cycle counts for independently mounted and in-line cord controls.
In practice, these clauses tell the user how quickly the sensing element responds, how it behaves after thermal cycling, and how many operating cycles the control must endure. That is the data that matters when comparing a thermostat for a cooker, a limiter for a heater or a safety cut-out in a refrigeration or water-heating application.
Which special applications have extra requirements
Annex J covers thermistor elements and controls using thermistors. Annex DD adds a test method for controls intended for agricultural confinement buildings, with exposure to corrosive gases, humidity, disinfectants and dust. Annex EE is a selection and application guide that explains how temperature sensing controls are classified and how they are used in typical appliances.
That means the standard is not just a generic electrical-control document. It also gives extra rules for controls that work in harsh farming environments, and guidance for selecting the right control for domestic, commercial and building applications.
What terms does EN IEC 60730-2-9:2026 define?
- single-operation device (SOD) - A control with a temperature sensing element intended to operate only once and then be completely replaced.
- bimetallic single-operation device - An SOD with a bimetallic sensing element that does not reset above the declared temperature.
- non-bimetallic single-operation device - An SOD with a non-bimetallic thermal element that operates once and then needs complete or partial replacement.
- room thermostat - A thermostat intended to control the temperature of habitable space.
- boiler thermostat - A thermostat intended to control boiler or liquid temperature.
- voltage maintained thermal cut-out - A thermal cut-out that stays operated because of the voltage across it in the operated state.
- time factor - The transient response of a temperature sensing control to a defined change in the activating quantity.
- agricultural confinement building - A heated and/or cooled farm structure where waste and feed can create corrosive compounds not normally found in freely ventilated farm buildings.
Who uses EN IEC 60730-2-9:2026?
EN IEC 60730-2-9:2026 is used by control manufacturers, appliance OEMs, building automation designers, test laboratories, certification bodies and quality teams. It is relevant to heating, air-conditioning, cooking, refrigeration, laundry, water-heating, commercial catering, agricultural and smart-enabled equipment.
For manufacturers, the standard supports design and type testing. For buyers and OEMs, it helps specify the right control type, declared operating values and application limits. For labs and certification teams, it gives the test methods and pass/fail basis.
What changed in EN IEC 60730-2-9:2026 from the previous edition?
EN IEC 60730-2-9:2026 is the fifth edition and it supersedes EN IEC 60730-2-9:2019, including amendments A1:2019 and A2:2020. The stated technical revision is the adoption of IEC 60730-1:2022 and the significant changes carried in that Part 1 edition.
Which standards are used with EN IEC 60730-2-9:2026?
- EN IEC 60730-1 - the base part used together with Part 2-9 for general requirements, tests and definitions.
- IEC 60216-1 / EN IEC 60216-1 - provides ageing procedures and evaluation of thermal endurance test results for insulating materials.
- IEC 60691 - referenced for thermal links connected with some SOD-related distinctions.
- ISO 16484 series and IEC 63044 series - define the building-automation context named in the scope.
- IEC 60335 series - used in Annex EE for application examples and to show where temperature sensing controls operate in appliance tests.
- IEC 60079 series - referenced in Annex DD because agricultural-confinement controls are not intended for explosive atmospheres.
What does the EN IEC 60730-2-9:2026 document contain?
The document contains the clause structure for scope, references, terms, safety, construction, environmental and endurance testing, EMC, and abnormal operation. It includes Table 1 and Table H.1 for declared technical information, Table AA.1 for manufacturing deviation and drift, Table BB.1 for time factor values, and Table CC.1 for cycle counts.
It also includes test methods and figures for practical verification, such as the impact tool, the aluminium cylinder for temperature-change testing, and the time-factor diagrams in Annex BB. Annex DD gives the detailed test sequence for agricultural confinement buildings, while Annex EE gives classification guidance, appliance examples and selection tables for common temperature sensing controls.
Relations
- Effective Date
- 14-May-2024
- Effective Date
- 14-May-2024
- Effective Date
- 14-May-2024
- Effective Date
- 16-Jun-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 07-Jul-2026
- Effective Date
- 07-Jul-2026
- Effective Date
- 07-Jul-2026
- Effective Date
- 07-Jul-2026
- Effective Date
- 07-Jul-2026
- Effective Date
- 07-Jul-2026
- Referred By
EN 12828:2012+A1:2014 - Heating systems in buildings - Design for water-based heating systems - Effective Date
- 07-Jul-2026
- Effective Date
- 07-Jul-2026
- Effective Date
- 07-Jul-2026
- Effective Date
- 07-Jul-2026
Frequently Asked Questions
EN IEC 60730-2-9:2026 is a standard published by CLC. Its full title is "Automatic electrical controls - Part 2-9: Particular requirements for temperature sensing controls". This standard covers: This clause of Part 1 is replaced by the following: This document applies to temperature sensing controls – for use in, on, or in association with equipment for household appliance and similar use, including equipment for heating, air-conditioning and similar applications. The equipment can use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof. NOTE 1 Throughout this document, the word "equipment" means "appliance and equipment" and "controls" means "temperature sensing controls". – for building automation within the scope of ISO 16484 series and IEC 63044 series (HBES/BACS); EXAMPLE 1 Independently mounted temperature sensing controls, controls in smart grid systems and controls for building automation systems within the scope of ISO 16484-2. – for equipment that is used by the public, such as equipment intended to be used in shops, offices, hospitals, farms and commercial and industrial applications; EXAMPLE 2 Controls for commercial catering, heating and air-conditioning equipment. – that are smart enabled controls; EXAMPLE 3 Smart grid control, remote interfaces/control of energy-consuming equipment including computer or smart phone. – that are AC or DC powered controls with a rated voltage not exceeding 690 V AC or 600 V DC; – used in, on, or in association with equipment that use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof; – utilized as part of a control system or controls which are mechanically integral with multifunctional controls having non-electrical outputs; – using NTC or PTC thermistors and to discrete thermistors, requirements for which are contained in Annex J; – that have electrical circuits and control circuits which are, for example, operated by bimetals, magnet coils, memory metals, pressure elements, temperature-sensitive expansion elements or electronic elements. – as well as manual controls when such are electrically and/or mechanically integral with automatic controls. NOTE 2 Requirements for manually actuated mechanical switches not forming part of an automatic control are contained in IEC 61058-1-1. This document applies to – the inherent safety of automatic electrical controls, and – functional safety of temperature sensing controls and safety related systems, – controls where the performance (for example the effect of EMC phenomena) of the product can impair the overall safety and performance of the controlled system, – the operating values, operating times, and operating sequences where such are associated with equipment safety and to the testing of automatic electrical temperature sensing control devices used in, or in association with, equipment, EXAMPLE 4 Boiler thermostats, fan controls, temperature limiters and thermal cut-outs. – electrical safety of temperature sensing controls with non-electrical outputs such as refrigerant flow and gas controls, – single-operation devices as defined in this document. This document specifies the requirements for construction, operation and testing of automatic electrical controls used in, on, or in association with an equipment. This document does not – apply to automatic electrical temperature sensing controls intended exclusively for industrial process applications unless explicitly mentioned in the relevant part 2 or the equipment standard. However, this document can be applied to evaluate automatic electrical controls intended specifically for industrial applications in cases where no relevant safety standard exists. – take into account the response value of an automatic action of a control, if such a response value is dependent upon the method of mounting the control in the equipment. Where a response value is of significant purpose for the protection of the user, or surroundings, the value defined in the appropriate equipment standard or as determined by the manufacturer will apply. – address the integrity of the output signal to the networ
This clause of Part 1 is replaced by the following: This document applies to temperature sensing controls – for use in, on, or in association with equipment for household appliance and similar use, including equipment for heating, air-conditioning and similar applications. The equipment can use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof. NOTE 1 Throughout this document, the word "equipment" means "appliance and equipment" and "controls" means "temperature sensing controls". – for building automation within the scope of ISO 16484 series and IEC 63044 series (HBES/BACS); EXAMPLE 1 Independently mounted temperature sensing controls, controls in smart grid systems and controls for building automation systems within the scope of ISO 16484-2. – for equipment that is used by the public, such as equipment intended to be used in shops, offices, hospitals, farms and commercial and industrial applications; EXAMPLE 2 Controls for commercial catering, heating and air-conditioning equipment. – that are smart enabled controls; EXAMPLE 3 Smart grid control, remote interfaces/control of energy-consuming equipment including computer or smart phone. – that are AC or DC powered controls with a rated voltage not exceeding 690 V AC or 600 V DC; – used in, on, or in association with equipment that use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof; – utilized as part of a control system or controls which are mechanically integral with multifunctional controls having non-electrical outputs; – using NTC or PTC thermistors and to discrete thermistors, requirements for which are contained in Annex J; – that have electrical circuits and control circuits which are, for example, operated by bimetals, magnet coils, memory metals, pressure elements, temperature-sensitive expansion elements or electronic elements. – as well as manual controls when such are electrically and/or mechanically integral with automatic controls. NOTE 2 Requirements for manually actuated mechanical switches not forming part of an automatic control are contained in IEC 61058-1-1. This document applies to – the inherent safety of automatic electrical controls, and – functional safety of temperature sensing controls and safety related systems, – controls where the performance (for example the effect of EMC phenomena) of the product can impair the overall safety and performance of the controlled system, – the operating values, operating times, and operating sequences where such are associated with equipment safety and to the testing of automatic electrical temperature sensing control devices used in, or in association with, equipment, EXAMPLE 4 Boiler thermostats, fan controls, temperature limiters and thermal cut-outs. – electrical safety of temperature sensing controls with non-electrical outputs such as refrigerant flow and gas controls, – single-operation devices as defined in this document. This document specifies the requirements for construction, operation and testing of automatic electrical controls used in, on, or in association with an equipment. This document does not – apply to automatic electrical temperature sensing controls intended exclusively for industrial process applications unless explicitly mentioned in the relevant part 2 or the equipment standard. However, this document can be applied to evaluate automatic electrical controls intended specifically for industrial applications in cases where no relevant safety standard exists. – take into account the response value of an automatic action of a control, if such a response value is dependent upon the method of mounting the control in the equipment. Where a response value is of significant purpose for the protection of the user, or surroundings, the value defined in the appropriate equipment standard or as determined by the manufacturer will apply. – address the integrity of the output signal to the networ
EN IEC 60730-2-9:2026 is classified under the following ICS (International Classification for Standards) categories: 97.120 - Automatic controls for household use. The ICS classification helps identify the subject area and facilitates finding related standards.
EN IEC 60730-2-9:2026 has the following relationships with other standards: It is inter standard links to EN IEC 60730-2-9:2019, EN IEC 60730-2-9:2019/A1:2019, EN IEC 60730-2-9:2019/A2:2020, EN IEC 60216-1:2026, EN 50465:2015, EN 89:1999, EN 303-1:1999, EN 15034:2006, EN 12098-3:2002, EN IEC 62933-5-1:2024, EN 15033:2006, EN 12828:2012+A1:2014, EN 12098-4:2005, EN 13278:2013, EN 12828:2012. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN IEC 60730-2-9:2026 is associated with the following European legislation: EU Directives/Regulations: 2014/30/EU, 2014/35/EU; Standardization Mandates: M/511, M/552. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN IEC 60730-2-9:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2026
Nadomešča:
SIST EN IEC 60730-2-9:2019
SIST EN IEC 60730-2-9:2019/A1:2019
SIST EN IEC 60730-2-9:2019/A2:2020
Avtomatske električne krmilne naprave - 2-9. del: Posebne zahteve za
temperaturne regulatorje
Automatic electrical controls - Part 2-9: Particular requirements for temperature sensing
controls
Automatische elektrische Regel- und Steuergeräte – Teil 2-9: Besondere Anforderungen
an temperaturabhängige Regel- und Steuergeräte
Dispositifs de commande électrique automatiques - Partie 2-9: Exigences particulières
pour les dispositifs de commande thermosensibles
Ta slovenski standard je istoveten z: EN IEC 60730-2-9:2026
ICS:
97.120 Avtomatske krmilne naprave Automatic controls for
za dom household use
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60730-2-9
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2026
ICS 97.120 Supersedes EN IEC 60730-2-9:2019; EN IEC 60730-2-
9:2019/A1:2019; EN IEC 60730-2-9:2019/A2:2020
English Version
Automatic electrical controls - Part 2-9: Particular requirements
for temperature sensing controls
(IEC 60730-2-9:2026)
Dispositifs de commande électrique automatiques - Partie Automatische elektrische Regel- und Steuergeräte - Teil 2-
2-9: Exigences particulières pour les dispositifs de 9: Besondere Anforderungen an temperaturabhängige
commande thermosensibles Regel- und Steuergeräte
(IEC 60730-2-9:2026) (IEC 60730-2-9:2026)
This European Standard was approved by CENELEC on 2026-06-22. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60730-2-9:2026 E
European foreword
The text of document 72/1534/FDIS, future edition 5 of IEC 60730-2-9, prepared by TC 72 "Automatic
electrical controls" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-07-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-07-31
document have to be withdrawn
This document supersedes EN IEC 60730-2-9:2019 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with EN IEC 60730-1.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60730-2-9:2026 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60079 series NOTE Approved as EN IEC 60079 series
IEC 60335-2-2 NOTE Approved as EN IEC 60335-2-2
IEC 60335-2-3 NOTE Approved as EN 60335-2-3
IEC 60335-2-4 NOTE Approved as EN IEC 60335-2-4
IEC 60335-2-5 NOTE Approved as EN 60335-2-5
IEC 60335-2-6 NOTE Approved as EN 60335-2-6
IEC 60335-2-7 NOTE Approved as EN IEC 60335-2-7
IEC 60335-2-8 NOTE Approved as EN 60335-2-8
IEC 60335-2-9 NOTE Approved as EN IEC 60335-2-9
IEC 60335-2-11 NOTE Approved as EN IEC 60335-2-11
IEC 60335-2-13 NOTE Approved as EN 60335-2-13
IEC 60335-2-14 NOTE Approved as EN IEC 60335-2-14
IEC 60335-2-15 NOTE Approved as EN 60335-2-15
IEC 60335-2-16 NOTE Approved as EN 60335-2-16
IEC 60335-2-17 NOTE Approved as EN 60335-2-17
IEC 60335-2-21 NOTE Approved as EN 60335-2-21
IEC 60335-2-23 NOTE Approved as EN IEC 60335-2-23
IEC 60335-2-24 NOTE Approved as EN IEC 60335-2-24
IEC 60335-2-25 NOTE Approved as EN IEC 60335-2-25
IEC 60335-2-29 NOTE Approved as EN 60335-2-29
IEC 60335-2-30 NOTE Approved as EN 60335-2-30
IEC 60335-2-34 NOTE Approved as EN IEC 60335-2-34
IEC 60335-2-35 NOTE Approved as EN 60335-2-35
IEC 60335-2-41 NOTE Approved as EN IEC 60335-2-41
IEC 60335-2-61 NOTE Approved as EN 60335-2-61
IEC 60335-2-73 NOTE Approved as EN 60335-2-73
IEC 60335-2-75 NOTE Approved as EN IEC 60335-2-75
IEC 60335-2-80 NOTE Approved as EN IEC 60335-2-80
IEC 60335-2-89 NOTE Approved as EN IEC 60335-2-89
IEC 60691 NOTE Approved as EN IEC 60691
IEC 60730-2-22 NOTE Approved as EN IEC 60730-2-22
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Annex ZA of EN IEC 60730-1, applies, except as follows:
Add:
Publication Year Title EN/HD Year
IEC 60216-1 - Electrical insulating materials - Thermal EN IEC 60216-1 -
endurance properties - Part 1: Ageing
procedures and evaluation of test results
IEC 60730-2-9 ®
Edition 5.0 2026-05
INTERNATIONAL
STANDARD
Automatic electrical controls -
Part 2-9: Particular requirements for temperature sensing controls
ICS 97.120 ISBN 978-2-8327-1229-0
IEC 60730-2-9:2026-05(en)
IEC 60730-2-9:2026 IEC 2026
CONTENTS
FOREWORD . 3
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
4 General . 9
5 Required technical information . 10
6 Protection against electric shock . 11
7 Provision for protective earthing . 11
8 Terminals and terminations . 11
9 Constructional requirements . 11
10 Threaded parts and connections . 16
11 Creepage distances, clearances and distances through solid insulation . 17
12 Components . 17
13 Fault assessment on electronic circuits. 17
14 Moisture and dust resistance . 17
15 Electric strength and insulation resistance . 18
16 Heating . 18
17 Manufacturing deviation and drift . 19
18 Environmental stress . 19
19 Endurance . 19
20 Mechanical strength . 24
21 Resistance to heat, fire and tracking . 25
22 Resistance to corrosion . 25
23 Electromagnetic compatibility (EMC) requirements – Emission . 25
24 Normal operation . 25
25 Electromagnetic compatibility (EMC) requirements – Immunity . 25
26 Abnormal operation tests . 25
Annex G (normative) Resistance to heat, fire and tracking tests . 27
Annex H (normative) Requirements related to functional safety . 28
Annex J (normative) Requirements for thermistor elements and controls using
thermistors . 37
Annex Q (informative) Regional differences relevant to the member countries of
Cenelec . 38
Annex R (informative) National differences relevant in the United States of America . 39
Annex S (informative) National differences relevant in Japan . 40
Annex T (informative) National differences relevant in Canada . 41
a, b
Annex AA (informative) Maximum manufacturing deviation and drift . 42
Annex BB (normative) Time factor . 43
Annex CC (normative) Number of cycles . 47
Annex DD (normative) Controls for use in agricultural confinement buildings . 48
Annex EE (informative) Guide to the application of temperature sensing controls within
the scope of IEC 60730-2-9 . 51
IEC 60730-2-9:2026 IEC 2026
Bibliography . 73
Figure 101 – Impact tool . 15
Figure 102 – Aluminium cylinder for temperature change method . 23
Figure BB.1 – Determination of time factor in the case of a sudden temperature change . 44
Figure BB.2 – Determination of time factor in the case of a linear rise of test-bath
temperature . 45
Figure EE.1 – Thermostat . 61
Figure EE.2 – Self-resetting temperature limiter . 62
Figure EE.3 – Non-self-resetting temperature limiter . 62
Figure EE.4 – Self-resetting thermal cut-out. 64
Figure EE.5 – Manual reset thermal cut-out . 64
Figure EE.6 – Single-operation device . 66
Figure EE.7 – Three-stage control system . 67
Figure EE.8 – Schematic diagram showing usage of various controls approved to
IEC 60730-2-9 . 69
Table 1 – Required technical information and methods of providing these information . 10
Table H.1 – Additional items to Table 1 . 28
Table AA.1 – Recommended values of manufacturing deviation and drift . 42
Table BB.1 – Method to determine and verify time factor values (see 9.101) . 46
Table CC.1 – Number of cycles for independently mounted and in-line cord controls . 47
Table EE.1 – Typical examples of the classification of temperature sensing controls in
accordance with IEC 60730-2-9 . 67
Table EE.2 – Examples of controls expected to operate during IEC 60335 series,
Clause 11 and Clause 19 . 70
Table EE.3 – Guidance on the common usage of types of control . 71
IEC 60730-2-9:2026 IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Automatic electrical controls -
Part 2-9: Particular requirements for temperature sensing controls
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60730-2-9 has been prepared by IEC technical committee 72: Automatic electrical controls.
It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2015, Amendment 1:2018
and Amendment 2:2020. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) adoption of IEC 60730-1:2022 with all of its significant changes to IEC 60730-1:2013,
IEC 60730-1:2013/AMD1:2015 and IEC 60730-1:2013/AMD2:2020.
IEC 60730-2-9:2026 IEC 2026
The text of this International Standard is based on the following documents:
Draft Report on voting
72/1534/FDIS 72/1540/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This part 2-9 is intended to be used in conjunction with IEC 60730-1. It was established on the
basis of the sixth edition of that standard (2022). Consideration can be given to future editions
of, or amendments to, IEC 60730-1.
This part 2-9 supplements or modifies the corresponding clauses in IEC 60730-1, so as to
convert that publication into the IEC standard: Particular requirements for temperature sensing
controls.
Where this part 2-9 states "addition", "modification" or "replacement", the relevant requirement,
test specification or explanatory matter in part 1 should be adapted accordingly.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies.
In the development of a fully international standard it has been necessary to take into
consideration the differing requirements resulting from practical experience in various parts of
the world and to recognize the variation in national electrical systems and wiring rules.
The reader's attention is drawn to the fact that Annex R, Annex S and Annex T list all of the "in-
some-country" clauses on differing practices of a less permanent nature relating to the subject
of this document.
In this publication:
The following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
explanatory matter: in smaller roman type;
–
– Defined terms: bold type.
Subclauses, notes or items which are additional to those in Part 1 are numbered starting from
101, additional annexes are lettered AA, BB, etc.
A list of all parts of the IEC 60730 series, under the general title: Automatic electrical controls,
can be found on the IEC website.
IEC 60730-2-9:2026 IEC 2026
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 60730-2-9:2026 IEC 2026
1 Scope
This clause of Part 1 is replaced by the following:
This document applies to temperature sensing controls
– for use in, on, or in association with equipment for household appliance and similar use,
including equipment for heating, air-conditioning and similar applications. The equipment
can use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof.
NOTE 1 Throughout this document, the word "equipment" means "appliance and equipment" and "controls" means
"temperature sensing controls".
– for building automation within the scope of ISO 16484 series and IEC 63044 series
(HBES/BACS);
EXAMPLE 1 Independently mounted temperature sensing controls, controls in smart grid systems and controls for
building automation systems within the scope of ISO 16484-2.
– for equipment that is used by the public, such as equipment intended to be used in shops,
offices, hospitals, farms and commercial and industrial applications;
EXAMPLE 2 Controls for commercial catering, heating and air-conditioning equipment.
– that are smart enabled controls;
EXAMPLE 3 Smart grid control, remote interfaces/control of energy-consuming equipment including computer or
smart phone.
– that are AC or DC powered controls with a rated voltage not exceeding 690 V AC or 600 V
DC;
– used in, on, or in association with equipment that use electricity, gas, oil, solid fuel, solar
thermal energy, etc., or a combination thereof;
– utilized as part of a control system or controls which are mechanically integral with
multifunctional controls having non-electrical outputs;
– using NTC or PTC thermistors and to discrete thermistors, requirements for which are
contained in Annex J;
– that have electrical circuits and control circuits which are, for example, operated by
bimetals, magnet coils, memory metals, pressure elements, temperature-sensitive
expansion elements or electronic elements.
– as well as manual controls when such are electrically and/or mechanically integral with
automatic controls.
NOTE 2 Requirements for manually actuated mechanical switches not forming part of an automatic control are
contained in IEC 61058-1-1.
This document applies to
– the inherent safety of automatic electrical controls, and
– functional safety of temperature sensing controls and safety related systems,
– controls where the performance (for example the effect of EMC phenomena) of the product
can impair the overall safety and performance of the controlled system,
– the operating values, operating times, and operating sequences where such are associated
with equipment safety and to the testing of automatic electrical temperature sensing
control devices used in, or in association with, equipment,
EXAMPLE 4 Boiler thermostats, fan controls, temperature limiters and thermal cut-outs.
– electrical safety of temperature sensing controls with non-electrical outputs such as
refrigerant flow and gas controls,
– single-operation devices as defined in this document.
IEC 60730-2-9:2026 IEC 2026
This document specifies the requirements for construction, operation and testing of automatic
electrical controls used in, on, or in association with an equipment.
This document does not
– apply to automatic electrical temperature sensing controls intended exclusively for
industrial process applications unless explicitly mentioned in the relevant part 2 or the
equipment standard. However, this document can be applied to evaluate automatic electrical
controls intended specifically for industrial applications in cases where no relevant safety
standard exists.
– take into account the response value of an automatic action of a control, if such a response
value is dependent upon the method of mounting the control in the equipment. Where a
response value is of significant purpose for the protection of the user, or surroundings, the
value defined in the appropriate equipment standard or as determined by the manufacturer
will apply.
– address the integrity of the output signal to the network devices, such as interoperability
with other devices unless it has been evaluated as part of the control system.
2 Normative references
This clause of Part 1 is applicable except as follows:
Addition:
IEC 60216-1, Electrical insulating materials - Thermal endurance properties - Part 1: Ageing
procedures and evaluation of test results
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
3.2 Definitions of types of controls according to purpose
Additional definitions:
3.2.101
single-operation device
SOD
control having a temperature sensing element which is intended to operate only once and
then requires complete replacement
3.2.102
bimetallic single-operation device
single-operation device (SOD) having a bimetallic temperature sensing element
Note 101 to entry: A bimetallic single-operation device (SOD) does not reset above a declared temperature (see
9.4.103).
Note 102 to entry: Requirements for thermal links (which are not allowed to reset) are contained in IEC 60691.
IEC 60730-2-9:2026 IEC 2026
3.2.103
non-bimetallic single-operation device
single-operation device (SOD) having a temperature sensing element which is part of a
combination action control, the operation of which cannot be separated from other functions
of the control and having a non-bimetallic thermal element that operates only once and then
needs complete or partial replacement
Note 101 to entry: When such parts can be tested separately, they are considered to be thermal links within the
scope of IEC 60691.
Note 102 to entry: The ageing period and thermal response of the device is dependent on the intended use of the
device. As a result, the nature of the testing applicable to the device is representative of the application conditions
for which the protective control is intended (see 7.2).
Note 103 to entry: Non-bimetallic SODs provide the equivalent of micro-disconnection.
3.2.104
room thermostat
independently mounted or incorporated thermostat intended to control the temperature of
habitable space
3.2.105
boiler thermostat
thermostat intended to control boiler/liquid temperature
3.2.106
voltage maintained thermal cut-out
thermal cut-out which is maintained in its operated condition by the voltage which appears
across it in that condition
Note 101 to entry: A voltage maintained thermal cut-out control can only be reset if disconnected from the
electrical supply.
3.2.107
agricultural thermostat
thermostat intended for use in agricultural confinement buildings
3.2.108
agricultural confinement building
farm structure characterized by being heated and/or cooled by artificial means, where
accumulation of animal food and waste can result in concentrations of corrosive compounds
not normally found in freely ventilated farm buildings (e.g. barns) and periodically disinfected
prior to subsequent similar use
3.3 Definitions relating to the function of controls
Additional definition:
3.3.101
time factor
transient response of temperature sensing controls by defined change of the activating
quantity
3.5 Definitions of types of control according to construction
Additional definitions:
3.5.101
push-and-turn actuation
two-step actuation accomplished by first pushing, then rotating the actuating member of the
control
IEC 60730-2-9:2026 IEC 2026
3.5.102
pull-and-turn actuation
two-step actuation accomplished by first pulling, then rotating the actuating member of the
control
3.101
permanent operation
continuous monitoring of the protective function during the operation of the appliance or system
for longer than 24 h
Note 101 to entry: 24 h is considered the typical time interval between a first and a second fault.
3.102
non-permanent operation
continuous monitoring of the protective function during the operation of the appliance or system
for less than 24 h
Note 101 to entry: 24 h is considered the typical time interval between a first and a second fault.
4 General
This clause of Part 1 is applicable except as follows:
4.2 General requirements
Additional note:
NOTE 101 Annex EE can be used as a guide for selecting and carrying out relevant tests as well as establishing
test levels and compliance criteria.
4.3 General notes on tests
4.3.2 Conditions of test
Additional subclauses:
4.3.2.101 For the purposes of the tests of this document and unless otherwise indicated,
ambient temperature excursions beyond T during abnormal operation as a precursor to the
max
operation of a manual reset thermal cut-out or a bimetallic SOD are ignored.
4.3.2.102 For manual reset thermal cut-outs and bimetallic SODs which have an
operating value above T , the temperature at the sensing element is raised, as necessary,
max
to achieve any cycling required during the tests.
4.3.3 Samples required
4.3.3.1 Addition:
Six samples of bimetallic SODs are used for the test of Clause 17 and a further six for the test
of Clause 19.
IEC 60730-2-9:2026 IEC 2026
5 Required technical information
This clause of Part 1is applicable except as follows:
5.2 Methods of providing technical information
Table 1 – Required technical information and methods of providing these information
Clause or
Information Method
subclause
Additional items:
101 Maximum sensing element temperature (other than relevant to 16.101 X
requirement 105)
Controls for use in or on cooking appliances
Controls for use in or on ovens of the self-cleaning type
Controls for use in or on food-handling appliances
Controls having parts containing liquid metal
102 Time factor with or without sheath 3.3.101 X
9.101
BB.2.2
103 3.2.101 X
SOD reset temperature (either –35 °C or 0 °C)
9.4.103
19.15.106.1.2
104 Number of cycles for bimetallic SOD with 0 °C reset 19.15.106.1.5 X
105 Maximum sensing element temperature in °C of controls used in self- 19.15.104 D
cleaning ovens (T )
e
106 20.102 D
Controls having parts containing liquid metal
107 Tensile yield strength 9.1.101 X
108 23.2.2 D
Minimum current for the purpose of the test of 23.2.2
109 T is the maximum ambient temperature in which the control may remain 16.4.101 D
max.1
continuously in the operated condition so that Table 17 temperatures are not
exceeded
110 Time period t is the maximum time during which the ambient temperature 16.4.101 D
can be higher than T after the control has operated
max.1
111 Temperature limit above which automatic reset of a manual reset thermal 3.2.106 X
cut-out or a voltage maintained thermal cut-out shall not occur (not higher 9.4.106
than –20 °C) 19.15.105
112 For type 2.P controls, the method of test 19.101 X
113 The click rate N or switching operations per minute for the purposes of 23 X
testing to CISPR 14-1
114 Rated functioning temperature (T ) of the sensing element, which causes 19.15.106.2 C
f
a non-bimetallic SOD to change state of conductivity
105,107
115 19.15.106.2.2 D
Ageing temperature for non-bimetallic SOD
106,107
116 19.15.106.2.2 D
Rate of rise of temperature for testing non-bimetallic SOD
117 Agricultural thermostat 3.2.107 D
9.4.107
9.6.3.101
Annex DD
IEC 60730-2-9:2026 IEC 2026
Additional footnotes:
This declaration applies only to temperature sensing controls containing liquid metal. For temperature
sensing controls used in or on self-cleaning ovens, this declaration is the temperature for the cooking
operation.
Metal is an inclusive term that encompasses chemically metallic elements such as sodium (Na), potassium
(K), and others. Mercury (Hg) is generally not allowed.
When no minimum is declared, the test value is 15 mA.
Consideration should be given to the provision of information by the equipment manufacturer relating to
the minimum time that the appliance has to be disconnected from the supply to allow a voltage maintained
thermal cut-out to reset.
Determined by the control manufacturer based on the opening temperature of the thermal-cut-out.
Determined by the control manufacturer referring to the actual maximum rate of rise probable in the
projected end-use equipment.
Non-bimetallic SODs are limited for use in appliances for heating or employing liquids or steam. They are
not suitable for instantaneous water heaters and storage water heaters
5.3 Class II symbol
5.3.1 Addition:
The symbol for class II shall be used on controls of class II integrated or incorporated in an
assembly utilizing a non-electrical energy source.
6 Protection against electric shock
This clause of Part 1 is applicable.
7 Provision for protective earthing
This clause of Part 1 is applicable.
8 Terminals and terminations
This clause of Part 1 is applicable.
9 Constructional requirements
This clause of Part 1 is applicable except as follows:
9.1 Materials
Additional subclauses:
9.1.101 Parts containing liquid metal
Controls containing liquid metal declared under Table 1, requirement 106, and parts of any
control that contain sodium (Na), potassium (K), or both, shall be constructed of metal that has
a tensile yield strength at least four times the circumferential (hoop) or other stress on the parts
at 1,2 times the maximum temperature of the sensing element (T ) in °C.
e
Compliance is checked by inspection of the manufacturer's declaration and by the test of 20.102.
IEC 60730-2-9:2026 IEC 2026
9.1.102 Material for non-bimetallic SODs
Insulating material used in non-bimetallic SODs as defined in this document shall comply with
the requirements of IEC 60216-1 and be suitable for the application.
9.3 Actuation and operation
9.3.9 Pull-cord actuated control
Additional note:
NOTE 101 The Note is not applicable to controls classified as type 1.X or 2.X or type 1.Z or 2.Z.
9.4 Actions
9.4.3 Type 2 action
Addition:
Capacitors shall not be connected across the contacts of a thermal cut-out.
Constructions requiring a soldering operation to reset thermal cut-outs are not permitted.
9.4.11 Type 1.H or 2.H action (a trip-free mechanism in which the contacts cannot be
prevented from opening and which can automatically be reset to the "closed"
position after normal operation conditions have been restored if the reset means
is held in the "reset" position)
Modification:
Replace the compliance criteria with the following:
Compliance is checked by inspection and by the tests as given in 9.4.11.101 to 9.4.11.106.
Additional subclauses:
9.4.11.101 For this test, the reset mechanism of the control will be held in the reset position
for the duration of the test from 9.4.11.102 to 9.4.11.104. The verification of the automatic non-
resetting above –35 °C will be carried out by 9.4.11.105 to 9.4.11.106. For SOD, the verification
of the automatic non-resetting above either +0 °C or –35 °C will be carried out by 9.4.11.105 to
9.4.11.106, as declared in item 103 of Table 1.
9.4.11.102 With the reset mechanism held in the reset position at room temperature,
continuity across contacts is observed by a low-energy circuit, 0,05 A maximum.
9.4.11.103 The control’s sensing element is then installed in an air circulating chamber or
a liquid bath and the control’s switch head is installed as in 16.5 a). When the whole control
is declared as the sensing element, the whole control is placed in an air-circulating chamber.
The control or the control’s sensing element is adjusted for the maximum set point
temperature. The chamber or liquid bath temperature shall be determined by positioning a
thermocouple wire adjacent to the control under test. The chamber or liquid bath temperature
is then raised from room temperature and held at approximately 10 K below the set point until
temperatures stabilize. The chamber or liquid bath temperature is then raised at a rate of not
more than 0,5 K per minute until the contact operates. Indication of contact separation is
observed by applying the method of 9.4.11.104.
IEC 60730-2-9:2026 IEC 2026
9.4.11.104 After the control has operated and with the reset mechanism still held in the
reset position, the temperature of the chamber or liquid bath is then reduced to determine if the
control automatically resets. Verification of contact closure is done by applying the method in
9.4.11.102.
9.4.11.105 The whole control or the control’s sensing element is then installed in an air
circulating chamber or liquid bath again and the control’s switch head (if applicable) is
installed as in 16.5 a) with the reset mechanism in its normal condition. The chamber or liquid
bath temperature shall be determined by positioning a thermocouple wire adjacent to the control
under test. The chamber or liquid bath temperature is raised from room temperature and held
at approximately 10 K below the set point until temperatures stabilize. The chamber or liquid
bath temperature is then raised at a rate of not more than 0,5 K per minute until the contact
operates. Indication of contact separation is observed by applying the method of 9.4.11.102.
9.4.11.106 After the control has operated, the temperature of the chamber is allowed to
cool down to either +0 °C or –35 °C. Indication of contact separation is observed by applying
the method of 9.4.11.102.
9.4.12 Type 1.J or 2.J action (a trip-free mechanism in which the contacts cannot be
prevented from opening and the control is not permitted to function as an
automatic reset device if the reset means is held in the "reset" or "on" position)
Modification:
Replace the compliance criteria with the following:
Compliance is checked by inspection and by the tests as given in 9.4.12.101 to 9.4.12.106.
Additional subclauses:
9.4.12.101 For this test, the reset mechanism of the control will be held in the reset position
for the duration of the test from 9.4.12.102 to 9.4.12.104. The verification of the automatic non-
resetting above –35 °C will be carried out by 9.4.12.105 to 9.4.12.106. For SOD, the verification
of the automatic non-resetting above either +0 °C or –35 °C will be carried out by 9.4.12.105 to
9.4.12.106, as declared in item 103 of Table 1.
9.4.12.102 With the reset mechanism held in the reset position at room temperature, contact
separation is observed by a low-energy circuit, 0,05 A maximum.
9.4.12.103 The control’s sensing element is then installed in an air circulating chamber or
liquid bath and the control’s switch head is installed as in 16.5. When the whole control is
declared as the sensing element, the whole control is placed in an air-circulating chamber.
The control or the control’s sensing element is adjusted for the maximum set point
temperature. The chamber or liquid bath temperature shall be determined by positioning a
thermocouple wire adjacent to the control under test. The chamber or liquid bath temperature
is raised from room temperature and held at approximately 10 K below the set point until
temperatures stabilize. The chamber or liquid bath temperature is then raised at a rate of not
more than 0,5 K per minute until 10 K over the operation temperature. Indication of contact
separation is still observed by applying the method of 9.4.12.102.
9.4.12.104 After the control has operated and with the reset mechanism still held in the
reset position, the temperature of the chamber or liquid bath is then reduced to determine if the
control automatically resets. Verification of contact closure is done by applying the method in
9.4.12.102.
IEC 60730-2-9:2026 IEC 2026
9.4.12.105 The whole control or the control’s sensing element is then installed in an air
circulating chamber or liquid bath again and the control’s switch head (if applicable) is
installed as in 16.5. with the reset mechanism in its normal condition. The chamber or liquid
bath temperature shall be determined by positioning a thermocouple wire adjacent to the
control under test. The chamber or liquid bath temperature is raised from room temperature
and held at approximately 10 K below the set point until temperatures stabilize. The chamber
or liquid bath temperature is then raised at a rate of not more than 0,5 K per minute until the
contact operates. Indication of contact separation is observed by applying the method of
9.4.12.102.
9.4.12.106 After the control has operated, the temperature of the chamber or liquid bath is
allowed to cool down to either +0 °C or –35 °C. Indication of contact separation is observed by
applying the method of 9.4.11.102.
9.4.13 Type 1.K or 2.K action (for sensing actions, no increase in the operating value as
the result of a breakage in the sensing element, or in parts connecting the
sensing element to the switch head)
Additional subclauses:
9.4.13.101 A type 2.K action
...