SIST EN IEC 60947-5-3:2026
(Main)Low-voltage switchgear and controlgear - Part 5-3: Control circuit devices and switching elements - Requirements for proximity devices with defined behaviour under fault conditions (PDDB) (IEC 60947-5-3:2026)
- Abstract
This part of IEC 60947 provides additional requirements to those given in IEC 60947-5-2 and IEC 60947-5-1:2024, Annex D (reed contact magnetic switches). It addresses the fault performance aspects of proximity devices with a defined behaviour under fault conditions (PDDB). It does not address any other characteristics that can be required for specific applications.
This document does not apply to protective equipment to directly detect the presence of persons, that are covered by the IEC 61496 series or IEC TS 62998 series.
NOTE 1 A PDDB device can be used to detect indirectly the presence of a person, for example by detecting the position of a platform on which the operator stands (example, garbage trucks).
This document does not specify requirements for the analogue output of PDDB, if any.
This document does not deal with any specific requirements on acoustic noise as the noise emission of proximity devices is not considered to be a relevant hazard.
A PDDB product is intended to be used as sensing subsystem of a safety related control system according to IEC 62061 or ISO 13849-1. Depending on construction principles and complexity, this document is based on product development of the IEC 61508 series to meet the product specific requirements of one or more of the following:
– IEC 61508 series;
– IEC 62061;
– ISO 13849 series.
NOTE 2 The Functional safety device type classification regarding functional safety correlates with IEC 62683-2-3.
This document includes requirements for PDDB when designed for use as part of an interlocking device according to ISO 14119.
This document does not consider aspects of:
– software updates and self-evolving behaviour;
– explosive atmospheres.
- Status
- Published
- Public Enquiry End Date
- 30-Apr-2025
- Publication Date
- 20-Oct-2026
- Technical Committee
- SKA - Switchgear and control gear
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 15-Oct-2026
- Due Date
- 20-Dec-2026
- Completion Date
- 21-Oct-2026
SIST EN IEC 60947-5-3:2026 is a SIST standard in the IEC 60947 series for low-voltage switchgear and controlgear. It sets additional requirements for proximity devices with defined behaviour under fault conditions (PDDB) when they are used as safety-related sensing subsystems, and when they are designed for interlocking devices.
The document is aimed at designers, manufacturers, test laboratories, and machine builders who need to classify a PDDB, define its output interface, verify its switching distances and timing, and show how it reacts to faults, EMC stress, and environmental influences in a safety function.
What does SIST EN IEC 60947-5-3:2026 specify?
SIST EN IEC 60947-5-3:2026 specifies extra requirements on top of IEC 60947-5-2 and IEC 60947-5-1:2024 Annex D for proximity devices with defined behaviour under fault conditions. It focuses on fault-performance aspects, not on every application-specific property of a proximity device.
The scope also says what is outside the document's reach. It does not apply to protective equipment that directly detects the presence of persons, which is covered by the IEC 61496 series or IEC/TS 62998 series. It also leaves out analogue output requirements, acoustic noise requirements, software updates and self-evolving behaviour, and explosive atmospheres.
The document is organised in the usual product-standard structure.
| Annex | What it covers |
|---|---|
| Annex A | Example of a safety related control system |
| Annex B | Classification of Binary Interfaces - Functional Safety aspects covered by dynamic testing |
| Annex C | Component categories used for fault analysis |
| Annex D | Void |
| Annex E | Product Information |
Main clauses run from Scope and Normative references through Terms and definitions, Classification, Characteristics, Product information, Normal service, mounting and transport conditions, Constructional and performance requirements, and Tests.
What are the key requirements of SIST EN IEC 60947-5-3:2026?
SIST EN IEC 60947-5-3:2026 is built around four things that matter in practice: how the PDDB is classified, how its safety-related switching behaviour is defined, how it must survive faults and disturbances, and how that behaviour is verified.
Classification and declared use
Clause 4 classifies PDDBs by sensing means, mechanical installation, construction form and size, type of output, connection method, electrical equipment class, functional safety device type, interlocking device type, target coding, and operating mode. In practice, this means the manufacturer has to declare what kind of PDDB it is, so the integrator can match it to the safety function and machine architecture.
Clause 4.6.2 introduces interface types A0, B0, C0, C1, C2 and C3 for digital inputs. These interface types define where the test pulses are generated and how they are handled, which matters when selecting the downstream control system and checking compatibility.
Clause 4.9 groups PDDBs into functional safety device types, and clause 4.10 and 4.11 align interlocking device type and target coding with ISO 14119. For the user, this is the basic information needed to choose a device with the right safety role and coding level.
Safety-related switching behaviour
Clause 5 defines the safety-related switching distances and the ON-zone and OFF-zone behaviour for the operating modes TP (Target Present), TA (Target Absent), and TP&TA. The practical point is that the PDDB must change state at the declared distances and stay within the stated acceptance limits when tested.
Clause 5.3 sets rated and limiting electrical values for the proximity switch and its switching element(s), including voltages, currents, supply frequency, load characteristics, short-circuit behaviour, and OFF-state behaviour of the OSSD. This tells the buyer and designer what electrical conditions the device is intended to handle.
Clause 5.5 links the device to safety integrity, and clause 5.6 refines Electrical Equipment Class III. In use, this is the basis for matching the PDDB to the required SIL or PL context and the chosen supply/protection concept.
Construction, EMC, and fault handling
Clause 6 requires product information, marking, installation and maintenance instructions, diagnostic test information, and environmental information, including an environmentally conscious design process and material declaration procedure. That matters because safe use depends on correct wiring, mounting, and periodic checks, not just the device itself.
Clause 8.2.6 sets EMC requirements for the safety-related function using performance criterion DS. A PDDB must either stay in a defined state or reach OFF-state within a stated time under disturbance, and any external devices needed to achieve that behaviour have to be identified in the product documentation.
Clause 8.5 requires failure mode and effects analysis (FMEA) and consideration of single faults, diagnostics, and lock-out conditions. If a dangerous fault is detected, the PDDB has to enter lock-out and remain there until the fault is cleared. In practice, this is how the standard forces a fail-safe response instead of a hidden dangerous condition.
Clause 8.6 asks the designer to consider influence quantities such as temperature, supply voltage, load, mounting tolerances, target approach angle, humidity, vibration, aging, ambient light, and processing delay. This matters because the declared switching distance and timing must still be credible in real installations.
Verification and test evidence
Clause 9 lays out the verification program. It includes type tests, routine tests, sampling tests, fault insertion tests, switching-distance tests, timing verification, EMC verification, and temperature/humidity testing.
For a buyer or certification body, the key point is that the standard does not stop at a paper declaration. It requires measured evidence for construction, performance, fault reaction, environmental influence, and EMC behaviour. Clause 9.3.5 is especially important because fault insertion tests are used to show that the diagnostic concept really works at component level.
What terms does SIST EN IEC 60947-5-3:2026 define?
| Term | Meaning |
|---|---|
| PDDB | Proximity device with a defined behaviour - a proximity switch used as a safety-related sensing subsystem to detect the presence of an object or the position of a part. |
| OSSD | Output signal switching device - the output terminal(s) that go to the OFF-state when the PDDB detects the target condition. |
| SSD | Secondary switching device - a device that goes to OFF-state in a lock-out condition and can trigger machine control action. |
| TP | Target Present operating mode - the mode where the PDDB responds with its switching behaviour when the target is present. |
| TA | Target Absent operating mode - the mode where the PDDB responds when the target is absent. |
| EUT | Equipment under Test - the representative sample used for verification tests. |
| FMEA | Failure mode and effects analysis - the method used to identify applicable faults and their effects. |
Who uses SIST EN IEC 60947-5-3:2026?
SIST EN IEC 60947-5-3:2026 is used by PDDB manufacturers, machine builders, safety engineers, test laboratories, and certification bodies. They use it when designing, selecting, testing, or assessing proximity devices that form part of a safety function.
It is relevant in low-voltage switchgear and controlgear, machine safety, and interlocking applications. Annex A shows a position-monitoring example for a movable guard, and the scope notes that a PDDB can also be used indirectly to detect the presence of a person by sensing another object or position.
What changed in SIST EN IEC 60947-5-3:2026 from the previous edition?
The foreword says this third edition includes these significant technical changes:
- The scope was updated, with refined fault-performance aspects and a clearer link to functional safety standards.
- The safe state is generally treated as the OFF-state.
- EMC requirements were updated, including references to IEC 60947-5-2 for acceptance criteria A, B and C, and the DS criterion in Table 15.
- Interface types for binary interfaces were introduced.
- Functional safety device types were aligned with ISO 13849-1:2022 Annex O.
- Interlocking device type and coding level were aligned with ISO 14119.
- Operating modes Target Present and Target Absent were introduced.
- The term switching distance replaces release and operating terms, and behaviour is described by operating mode.
- The context and verification of switching distances now consider ISO/IEC Guide 98-3:2008 (GUM) and IEC TR 6xxxxx:2025.
- Requirements for Electrical Equipment Class III were refined.
- Risk time was replaced by safety response time.
- Annex A was added as a new safety-related control system example.
- Test sequences were updated for the specific behaviour of a PDDB.
Which standards are used with SIST EN IEC 60947-5-3:2026?
SIST EN IEC 60947-5-3:2026 is read with several companion standards and test documents.
| Standard | What it contributes |
|---|---|
| IEC 60947-1 | General rules for low-voltage switchgear and controlgear |
| IEC 60947-5-1 | Base product requirements for control circuit devices, including reed contact magnetic switches in Annex D |
| IEC 60947-5-2 | Base requirements for proximity switches, reused throughout this part |
| IEC 60204-1 | Electrical equipment of machines and installation context |
| IEC 60529 | Degrees of protection provided by enclosures |
| IEC 60812 | FMEA and FMEDA method for fault analysis |
| IEC 61000-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11, -4-29 | EMC immunity test methods used for the DS performance criterion |
| IEC 61131-2 | Digital input and control equipment context for voltage and load behaviour |
| IEC 61140 | Protection against electric shock |
| IEC 61508-1, -2, -3 | Functional safety framework for E/E/PE safety-related systems |
| IEC 62061 | Functional safety of safety-related electrical, electronic and programmable electronic control systems |
| IEC 62683-2-3 DB | Functional safety and reliability data exchange |
| ISO 13849-1 | Safety-related parts of control systems and PL context |
| ISO 14119 | Interlocking devices associated with guards |
| ISO/IEC Guide 98-3 | Measurement uncertainty and GUM-based treatment of switching distance verification |
| ISO/IEC Guide 99 | Metrology vocabulary |
| IEC Guide 115 | Use of uncertainty in conformity assessment |
What does the SIST EN IEC 60947-5-3:2026 document contain?
The document contains the full structure needed to design and verify a PDDB as a safety component. It includes classification tables, safety-related switching-distance definitions, rated and limiting electrical values, marking and product-information requirements, construction rules, and detailed test methods.
Its tables and figures support practical engineering work. Examples include interface-type tables, operating-mode tables, switching-distance characteristics, voltage and current measurement arrangements, the fault-detection circuit for a stuck@high condition, EMC immunity requirements, and acceptance-criteria tables for the switching distance.
Clause 9 brings together the test programme for design validation and conformity assessment. It covers environmental conditioning, shock and vibration, EMC, fault insertion, timing, and switching-distance verification, so a reader can see what evidence the standard expects before the device is released for use.
Annex A gives a worked safety-system example with block diagram and reliability calculation. Annex B explains binary interface compatibility and dynamic test pulses, while Annex E collects product information fields that the manufacturer is expected to provide.
Relations
- Effective Date
- 01-Dec-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
- Effective Date
- 22-Sep-2026
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Frequently Asked Questions
SIST EN IEC 60947-5-3:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Low-voltage switchgear and controlgear - Part 5-3: Control circuit devices and switching elements - Requirements for proximity devices with defined behaviour under fault conditions (PDDB) (IEC 60947-5-3:2026)". This standard covers: This part of IEC 60947 provides additional requirements to those given in IEC 60947-5-2 and IEC 60947-5-1:2024, Annex D (reed contact magnetic switches). It addresses the fault performance aspects of proximity devices with a defined behaviour under fault conditions (PDDB). It does not address any other characteristics that can be required for specific applications. This document does not apply to protective equipment to directly detect the presence of persons, that are covered by the IEC 61496 series or IEC TS 62998 series. NOTE 1 A PDDB device can be used to detect indirectly the presence of a person, for example by detecting the position of a platform on which the operator stands (example, garbage trucks). This document does not specify requirements for the analogue output of PDDB, if any. This document does not deal with any specific requirements on acoustic noise as the noise emission of proximity devices is not considered to be a relevant hazard. A PDDB product is intended to be used as sensing subsystem of a safety related control system according to IEC 62061 or ISO 13849-1. Depending on construction principles and complexity, this document is based on product development of the IEC 61508 series to meet the product specific requirements of one or more of the following: – IEC 61508 series; – IEC 62061; – ISO 13849 series. NOTE 2 The Functional safety device type classification regarding functional safety correlates with IEC 62683-2-3. This document includes requirements for PDDB when designed for use as part of an interlocking device according to ISO 14119. This document does not consider aspects of: – software updates and self-evolving behaviour; – explosive atmospheres.
This part of IEC 60947 provides additional requirements to those given in IEC 60947-5-2 and IEC 60947-5-1:2024, Annex D (reed contact magnetic switches). It addresses the fault performance aspects of proximity devices with a defined behaviour under fault conditions (PDDB). It does not address any other characteristics that can be required for specific applications. This document does not apply to protective equipment to directly detect the presence of persons, that are covered by the IEC 61496 series or IEC TS 62998 series. NOTE 1 A PDDB device can be used to detect indirectly the presence of a person, for example by detecting the position of a platform on which the operator stands (example, garbage trucks). This document does not specify requirements for the analogue output of PDDB, if any. This document does not deal with any specific requirements on acoustic noise as the noise emission of proximity devices is not considered to be a relevant hazard. A PDDB product is intended to be used as sensing subsystem of a safety related control system according to IEC 62061 or ISO 13849-1. Depending on construction principles and complexity, this document is based on product development of the IEC 61508 series to meet the product specific requirements of one or more of the following: – IEC 61508 series; – IEC 62061; – ISO 13849 series. NOTE 2 The Functional safety device type classification regarding functional safety correlates with IEC 62683-2-3. This document includes requirements for PDDB when designed for use as part of an interlocking device according to ISO 14119. This document does not consider aspects of: – software updates and self-evolving behaviour; – explosive atmospheres.
SIST EN IEC 60947-5-3:2026 is classified under the following ICS (International Classification for Standards) categories: 29.120.40 - Switches; 29.130.20 - Low voltage switchgear and controlgear. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN IEC 60947-5-3:2026 has the following relationships with other standards: It is inter standard links to SIST EN 60947-5-3:2014, SIST EN 60204-1:2018/A1:2025, SIST EN 61508-3:2011, SIST EN 61000-4-4:2013, oSIST prEN IEC 60947-1:2026, SIST EN IEC 60730-1:2025, SIST EN IEC 61131-2:2026, SIST EN IEC 61000-4-6:2023, SIST EN 61000-4-5:2014, SIST EN 61000-4-8:2010, SIST EN 60204-1:2018, SIST EN IEC 61000-4-11:2020, SIST EN IEC 60812:2018, SIST EN IEC 60068-2-1:2026, SIST EN IEC 60947-5-2:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN IEC 60947-5-3:2026 is associated with the following European legislation: EU Directives/Regulations: 2006/42/EC; Standardization Mandates: M/396. 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.
SIST EN IEC 60947-5-3:2026 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-december-2026
Nadomešča:
SIST EN 60947-5-3:2014
Nizkonapetostne stikalne in krmilne naprave - 5-3. del: Krmilne naprave in stikalni
elementi - Zahteve za približevalne naprave z določenim obnašanjem ob okvarnih
razmerah (PDDB) (IEC 60947-5-3:2026)
Low-voltage switchgear and controlgear - Part 5-3: Control circuit devices and switching
elements - Requirements for proximity devices with defined behaviour under fault
conditions (PDDB) (IEC 60947-5-3:2026)
Niederspannungsschaltgeräte - Teil 5-3: Steuergeräte und Schaltelemente -
Anforderungen für Näherungsschalter mit definiertem Verhalten unter
Fehlerbedingungen (PDDB) (IEC 60947-5-3:2026)
Appareillage à basse tension - Partie 5-3: Appareils et éléments de commutation pour
circuits de commande - Exigences pour dispositifs de détection de proximité à
comportement défini dans des conditions de défaut (PDDB) (IEC 60947-5-3:2026)
Ta slovenski standard je istoveten z: EN IEC 60947-5-3:2026
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60947-5-3
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2026
ICS 29.130.20 Supersedes EN 60947-5-3:2013
English Version
Low-voltage switchgear and controlgear - Part 5-3: Control
circuit devices and switching elements - Requirements for
proximity devices with defined behaviour under fault conditions
(PDDB)
(IEC 60947-5-3:2026)
Appareillage à basse tension - Partie 5-3: Appareils et Niederspannungsschaltgeräte - Teil 5-3: Steuergeräte und
éléments de commutation pour circuits de commande - Schaltelemente - Anforderungen für Näherungsschalter mit
Exigences pour dispositifs de détection de proximité à definiertem Verhalten unter Fehlerbedingungen (PDDB)
comportement défini dans des conditions de défaut (PDDB) (IEC 60947-5-3:2026)
(IEC 60947-5-3:2026)
This European Standard was approved by CENELEC on 2026-09-23. 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 60947-5-3:2026 E
European foreword
The text of document 121A/716/FDIS, future edition 3 of IEC 60947-5-3, prepared by SC 121A "Low-
voltage switchgear and controlgear" of IEC/TC 121 "Switchgear and controlgear and their assemblies
for low voltage" 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) 2027-10-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-10-31
document have to be withdrawn
This document supersedes EN 60947-5-3:2013 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 60947-1:2021 and EN IEC 60947-5-2:2020.
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 60947-5-3:2026 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 60068-2-6:2007 NOTE Approved as EN 60068-2-6:2008 (not modified)
IEC 60068-2-27:2008 NOTE Approved as EN 60068-2-27:2009 (not modified)
IEC 60204-1:2016 NOTE Approved as EN 60204-1:2018
IEC 60204-1:2016/AMD1:2021 NOTE Approved as EN 60204-1:2018/A1:2025 (not modified)
IEC 60364 (series) NOTE Approved as HD 60364 (series)
IEC 60947-5-6:1999 NOTE Approved as EN 60947-5-6:2000 (not modified)
IEC 61000-4-13:2002 NOTE Approved as EN 61000-4-13:2002 (not modified)
IEC 61000-6-7:2014 NOTE Approved as EN 61000-6-7:2015 (not modified)
IEC 61165:2006 NOTE Approved as EN 61165:2006 (not modified)
IEC 61508-1:2010 NOTE Approved as EN 61508-1:2010 (not modified)
IEC 61508-4:2010 NOTE Approved as EN 61508-4:2010 (not modified)
IEC 61508-5:2010 NOTE Approved as EN 61508-5:2010 (not modified)
IEC 61508-6:2010 NOTE Approved as EN 61508-6:2010 (not modified)
IEC 61508-3 NOTE Approved as EN 61508-3
IEC 61508-7:2010 NOTE Approved as EN 61508-7:2010 (not modified)
IEC 61511 (series) NOTE Approved as EN 61511 (series)
IEC 61709:2017 NOTE Approved as EN 61709:2017 (not modified)
IEC 61496 (series) NOTE Approved as EN IEC 61496 (series)
IEC 60529:1989 NOTE Approved as EN 60529:1991 (not modified)
IEC 62683-2-3 NOTE Approved as EN IEC 62683-2-3
IEC 31010:2019 NOTE Approved as EN IEC 31010:2019 (not modified)
IEC 62443 (series) NOTE Approved as EN IEC 62443 (series)
IEC 63208 NOTE Approved as EN IEC 63208
ISO 13849-2:2012 NOTE Approved as EN ISO 13849-2:2012 (not modified)
IEC 61709 NOTE Approved as EN 61709
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.
Publication Year Title EN/HD Year
IEC 60068-2-1 - Environmental testing - Part 2-1: Tests - Test A: EN IEC 60068-2- -
Cold 1
IEC 60068-2-30 2005 Environmental testing - Part 2-30: Tests - Test Db: EN 60068-2-30 2005
Damp heat, cyclic (12 h + 12 h cycle)
IEC 60204-1 2016 Safety of machinery - Electrical equipment of EN 60204-1 2018
machines - Part 1: General requirements
+ AMD1 2021 + A1 2025
IEC 60730-1 - Automatic electrical controls - Part 1: General EN IEC 60730-1 -
requirements
IEC 60812 - Failure modes and effects analysis (FMEA and EN IEC 60812 -
FMECA)
IEC 60947-1 – Low-voltage switchgear and controlgear - Part 1: EN IEC 60947-1 -
General rules
IEC 60947-5-1 2024 Low-voltage switchgear and controlgear - Part 5-1: EN IEC 60947-5- 2025
Control circuit devices and switching elements - 1
Electromechanical control circuit devices
IEC 60947-5-2 2019 Low-voltage switchgear and controlgear - Part 5-2: EN IEC 60947-5- 2020
Control circuit devices and switching elements - 2
Proximity switches
- - + A11 2022
IEC 61000-4-2 - Electromagnetic compatibility (EMC) - Part 4-2: EN IEC 61000-4- -
Testing and measurement techniques - 2
Electrostatic discharge immunity test
IEC 61000-4-3 - Electromagnetic compatibility (EMC) - Part 4-3 : EN IEC 61000-4- -
Testing and measurement techniques - Radiated, 3
radio-frequency, electromagnetic field immunity test
Under preparation. Stage at the time of publication: IEC CDV 60947-1:2026.
IEC 61000-4-4 - Electromagnetic compatibility (EMC) - Part 4-4: EN 61000-4-4 -
Testing and measurement techniques - Electrical
fast transient/burst immunity test
IEC 61000-4-5 - Electromagnetic compatibility (EMC) - Part 4-5: EN 61000-4-5 -
Testing and measurement techniques - Surge
immunity test
IEC 61000-4-6 - Electromagnetic compatibility (EMC) - Part 4-6: EN IEC 61000-4- -
Testing and measurement techniques - Immunity to 6
conducted disturbances, induced by radio-
frequency fields
IEC 61000-4-8 - Electromagnetic compatibility (EMC) - Part 4-8: EN 61000-4-8 -
Testing and measurement techniques - Power
frequency magnetic field immunity test
IEC 61000-4-11 - Electromagnetic compatibility (EMC) - Part 4-11: EN IEC 61000-4- -
Testing and measurement techniques - Voltage 11
dips, short interruptions and voltage variations
immunity tests for equipment with input current up
to 16 A per phase
IEC 61000-4-29 - Electromagnetic compatibility (EMC) - Part 4-29: EN IEC 61000-4- -
Testing and measurement techniques - Voltage 29
dips, short interruptions and voltage variations on
d.c. input power port immunity tests
IEC 61131-2 2017 Industrial-process measurement and control - EN IEC 61131-2 2025
Programmable controllers - Part 2: Equipment
requirements and tests
IEC 61140 2016 Protection against electric shock - Common aspects EN 61140 2016
for installation and equipment
IEC 61508-2 2010 Functional safety of EN 61508-2 2010
electrical/electronic/programmable electronic
safety-related systems - Part 2: Requirements for
electrical/electronic/programmable electronic
safety-related systems
IEC 61508-3 - Functional safety of EN 61508-3 -
electrical/electronic/programmable electronic
safety-related systems - Part 3: Software
requirements
IEC 62061 2021 Safety of machinery - Functional safety of safety- EN IEC 62061 2021
related control systems
+ A1 2024 + A1 2024
ISO 13849-1 2023 Safety of machinery - Safety-related parts of control EN ISO 13849-1 2023
systems - Part 1: General principles for design
ISO 14119 2024 Safety of machinery - Interlocking devices EN ISO 14119 2025
associated with guards - Principles for design and
selection
- - + A11 2026
IEC 60947-5-3 ®
Edition 3.0 2026-08
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear -
Part 5-3: Control circuit devices and switching elements - Requirements for
proximity devices with defined behaviour under fault conditions (PDDB)
ICS 29.130.20 ISBN 978-2-8327-1385-3
IEC 60947-5-3:2026-08(en)
IEC 60947-5-3:2026 © IEC 2026
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Terms, definitions, symbols and abbreviated terms . 11
3.1 General terms and definitions . 11
3.2 Terms and definitions concerning Annex B. 14
3.3 Symbols and abbreviated terms . 16
4 Classification . 17
4.1 General . 17
4.2 Classification according to sensing means . 17
4.3 Classification according to the mechanical installation . 18
4.4 Classification according to the construction form and size . 18
4.5 void . 18
4.6 Classification according to type of output . 18
4.6.1 General . 18
4.6.2 Interface type . 18
4.7 Classification according to method of connection . 18
4.8 Electrical equipment class . 19
4.9 Functional safety device types . 19
4.9.1 General . 19
4.9.2 Type 1 functional safety device . 19
4.9.3 Type 2 functional safety device . 19
4.9.4 Type 3 functional safety device . 19
4.10 Interlocking device type . 19
4.10.1 General . 19
4.10.2 Interlocking device type 3 . 20
4.10.3 Interlocking device type 4 . 20
4.11 Target coding . 20
4.11.1 General . 20
4.11.2 Coding level low . 20
4.11.3 Coding level medium . 20
4.11.4 Coding level high . 20
4.12 Operating mode . 20
4.12.1 General . 20
4.12.2 Operating mode TP (target present) . 21
4.12.3 Operating mode TA (target absent) . 21
4.12.4 Combined operating modes TP&TA . 21
5 Characteristics . 21
5.1 General . 21
5.2 Safety related switching distances . 21
5.2.1 General . 21
5.2.2 Switching distance s . 22
As
5.2.3 Switching distance s . 23
Ps
5.2.4 Sensing means with operating range . 23
5.3 Rated and limiting values for the proximity switch and switching element(s). . 23
5.3.1 Voltages . 23
IEC 60947-5-3:2026 © IEC 2026
5.3.2 Currents . 24
5.3.3 Rated supply frequency . 24
5.3.4 Void . 24
5.3.5 Normal load and abnormal load characteristics . 24
5.3.6 Short-circuit characteristics . 24
5.3.7 OFF-state of the OSSD . 25
5.3.8 Interface Types A0, B0, C0, C1, C2, C3 . 25
5.4 Utilization categories for the switching element . 25
5.5 Safety related characteristics . 26
5.5.1 Proximity device with defined behaviour . 26
5.5.2 Safety integrity . 26
5.5.3 Fault detection on the connection lines of the OSSDs . 27
5.6 Electrical equipment Class III . 27
6 Product information . 28
6.1 Nature of information – Identification. 28
6.2 Marking . 28
6.2.1 General . 28
6.2.2 Terminal identification and marking . 28
6.2.3 Marking of electrical equipment Class II . 28
6.2.4 Marking of electrical equipment Class III. 28
6.3 Instructions for installation, operation, and maintenance . 29
6.3.1 General . 29
6.3.2 Information for PDDB of electrical equipment Class III . 29
6.3.3 Diagnostic test information . 29
6.3.4 Information about the interface types . 30
6.4 Environmental information . 30
6.4.1 Environmentally conscious design process (ECD process) . 30
6.4.2 Procedure to establish material declaration . 30
7 Normal service, mounting and transport conditions . 30
7.1 Normal service conditions . 30
7.2 Conditions during transport and storage . 30
7.3 Mounting . 30
8 Constructional and performance requirements . 30
8.1 Constructional requirements . 30
8.1.1 Materials . 30
8.1.2 Current-carrying parts and their connections . 31
8.1.3 Clearance and creepage distances . 31
8.1.4 Actuation . 31
8.1.5 Void . 31
8.1.6 Void . 31
8.1.7 Terminals . 31
8.1.8 Void . 31
8.1.9 Provision for protective earthing . 31
8.1.10 Enclosure degree of protection . 31
8.1.11 Requirements for proximity switches with integrally connected cables . 32
8.1.12 Electrical equipment Class II . 32
8.1.13 Chemical stress . 32
8.1.14 Equipment design . 32
8.1.15 Protection against artificial optical radiation . 32
IEC 60947-5-3:2026 © IEC 2026
8.1.16 Biological and chemical effects . 32
8.1.17 Unattended operation . 32
8.1.18 Software related security . 32
8.1.19 Requirements for embedded software . 32
8.1.20 Requirements for safety related hardware . 33
8.1.21 Limited energy source . 33
8.2 Performance requirements . 35
8.2.1 Operating conditions . 35
8.2.2 Temperature rise . 42
8.2.3 Dielectric properties . 42
8.2.4 Ability to make and break under normal load and abnormal load
conditions . 42
8.2.5 Conditional short-circuit current . 42
8.2.6 Electromagnetic compatibility (EMC) . 43
8.3 Physical dimensions . 46
8.4 Shock and vibration . 46
8.4.1 General . 46
8.4.2 Shock . 46
8.4.3 Vibration . 47
8.4.4 Results to be obtained . 47
8.4.5 Special environmental condition – damp heat, salt mist, shock and
vibration . 47
8.5 Fault detection requirements . 47
8.5.1 Faults . 47
8.5.2 Diagnostic . 48
8.5.3 Lock-out condition . 48
8.6 Measures to influence quantities . 48
9 Tests . 49
9.1 Kind of tests . 49
9.1.1 General . 49
9.1.2 Type tests. 49
9.1.3 Routine tests . 49
9.1.4 Sampling tests . 49
9.2 Compliance with constructional requirements . 49
9.2.1 General . 49
9.2.2 Test of materials to abnormal heat and fire . 50
9.2.3 void . 50
9.2.4 Enclosures for equipment . 50
9.2.5 Mechanical and electrical properties of terminals . 50
9.2.6 void . 50
9.2.7 Limited energy source test . 50
9.2.8 Stored charge energy test. 50
9.2.9 Conduit pull-out test, torque test and bending test with metallic conduits . 50
9.2.10 Test of earth continuity for protective earth . 50
9.2.11 Breakdown of components . 50
9.2.12 Short-circuit and overload protection of ports . 50
9.2.13 void . 50
9.2.14 Wire flexing test . 50
9.2.15 Artificial optical radiation test . 50
IEC 60947-5-3:2026 © IEC 2026
9.3 Performances . 51
9.3.1 Test sequences . 51
9.3.2 General test conditions . 52
9.3.3 Performance under no load, normal load and abnormal load conditions . 53
9.3.4 Performances under short-circuit current conditions . 58
9.3.5 Fault insertion tests . 58
9.4 Verification of the safety related switching distances. 59
9.4.1 General . 59
9.4.2 Switching distance test . 59
9.5 Verification of timing . 60
9.5.1 General . 60
9.5.2 Verification of turn-on time (t ) . 60
on
9.5.3 Verification of turn-off time (t ) . 60
off
9.6 Verification of electromagnetic compatibility . 61
9.6.1 General . 61
9.6.2 Immunity . 61
9.6.3 Emission . 61
9.7 Test results and test report . 61
9.8 Ambient temperature variation and humidity . 62
9.8.1 General . 62
9.8.2 Temperature variation . 62
9.8.3 Temperature variation and humidity test . 62
9.8.4 Condensing test. 63
Annex A (informative) Example of a safety related control system . 64
A.1 Description . 64
A.1.1 General . 64
A.1.2 Safety integrity level requirements, performance level requirements . 64
A.1.3 Conditions of use . 64
A.2 Realization . 65
A.3 Collection of data . 65
A.4 Quantitative calculation . 66
A.5 Results . 68
Annex B (informative) Classification of binary interfaces – Functional safety aspects
covered by dynamic testing . 69
B.1 General . 69
B.2 Minimum information on compatibility to be provided in the product
documentation . 69
B.2.1 General . 69
B.2.2 Basic electrical parameters . 69
B.2.3 Structure of the identifying key for a PDDB . 69
B.3 Characteristics of Interface Type A0 . 70
B.3.1 General . 70
B.3.2 Static characteristics of Interface Type A0 . 71
B.3.3 Dynamic characteristics of Interface Type A0 . 71
B.3.4 Product information to be supplied in the product documentation . 71
B.4 Characteristics of Interface Type B0 . 72
B.4.1 General . 72
B.4.2 Static characteristics of Interface Type B0 . 72
B.4.3 Dynamic characteristics of Interface Type B0 . 72
IEC 60947-5-3:2026 © IEC 2026
B.4.4 Product information to be supplied in the product documentation . 74
B.5 Characteristics of Interface Type C . 74
B.5.1 General . 74
B.5.2 Static characteristics of Interface Type C . 75
B.5.3 Dynamic characteristics of Interface Type C . 75
B.5.4 Classification of Interface Type C . 76
B.5.5 Product information to be supplied in the product documentation . 77
Annex C Void . 79
Annex D (informative) Void . 80
Annex E (informative) Product information . 81
Bibliography . 84
Figure 1 – Absent and present switching distance s and s for a PDDB with
As P
operating mode TP (target present) . 22
Figure 2 – Absent and present switching distance s and s for a PDDB with
A Ps
operating mode TA (target absent) . 23
Figure 3 – Characteristics of the absent switching distance . 36
Figure 4 – Characteristics of the present switching distance . 37
Figure 5 – Voltages and current characteristics . 54
Figure 6 – Test circuit diagram for the detection of stuck-at-high faults . 56
Figure A.1 – Position monitoring of movable guards for the prevention of hazardous
movements . 65
Figure A.2 – Safety-related block diagram of the safety-related function . 66
Figure B.1 – Interface Type A0 . 70
Figure B.2 – Interface Type B0 . 72
Figure B.3 – Test pulse delay ∆t much smaller than test pulse duration t . 73
i i
Figure B.4 – Test pulse delay ∆t greater than test pulse duration t . 73
i i
Figure B.5 – Interface Type C . 74
Figure B.6 – Dynamic behaviour Interface Type C . 75
Table 1 – Symbols and abbreviated terms . 16
Table 2 – Interface types of PDDBs . 18
Table 3 – Operating modes of PDDBs . 20
Table 4 – Static characteristics of Interface Types A0, B0, C0, C1, C2 and C3 . 25
Table 5 – Dynamic characteristics of Interface Types A0, B0, C0, C1, C2 and C3 . 25
Table 6 – Characteristic safety values of functional safety device types . 27
Table 7 – Product information on Interface Types A0, B0, C0, C1, C2 and C3 . 30
Table 8 – Limits for limited energy sources without an overcurrent protective device . 34
Table 9 – Limits for limited energy sources with an overcurrent protective device . 34
Table 10 – Limits for limited energy source with limited current impedance . 35
Table 11 – Characteristics of the absent switching distance . 36
Table 12 – Characteristics of the present switching distance . 37
Table 13 – Acceptance criteria for s . 39
Ai
Table 14 – Acceptance criteria for s . 39
Pi
IEC 60947-5-3:2026 © IEC 2026
Table 15 – Operating voltages of 24 V solid state OSSD . 42
Table 16 – Reaction of PDDB during test . 44
Table 17 – Immunity test requirements for PDDBs . 45
Table A.1 – Collection of safety related reliability data . 65
Table B.1 – Basic electrical parameters . 69
Table B.2 – Product information Interface Type A0 – Source . 71
Table B.3 – Product information Interface Type A0 – Sink . 71
Table B.4 – Product information Interface Type B0 – source . 74
Table B.5 – Product information Interface Type B0 – sink . 74
Table B.6 – Classification for Interface Type C . 76
Table B.7 – Product information Interface Type C – Source . 77
Table B.8 – Product information Interface Type C – Sink . 78
Table E.1 – Product information . 81
IEC 60947-5-3:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Low-voltage switchgear and controlgear -
Part 5-3: Control circuit devices and switching elements -
Requirements for proximity devices with defined
behaviour under fault conditions (PDDB)
FOREWORD
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