Electromechanical switches for use in electrical and electronic equipment - Part 1: Generic specification

IEC 61020-1:2019 specifies the terminology, symbols, test methods and other necessary information to provide consistency in detail specifications for electromechanical switches.
This document relates to electromechanical switches intended for use in electrical and electronic appliances. Switches covered by this document:
a) are devices which open, close, or change the connection of a circuit by the mechanical motion of conducting parts (contacts);
b) have a maximum rated voltage of 480 V;
c) have a maximum rated current of 63 A.
This third edition cancels and replaces the second edition published in 2009.
This edition includes the following significant technical changes with respect to the previous edition:
a) In accordance with the ISO/IEC Directives, Part 2:2016, Clause 2 General has been replaced by two new clauses: Clause 2 Normative references and Clause 3 Terms, definitions, units and symbols.
2.4 Preferred values and 2.5 Marking have been moved to Clauses 5 and 6. In addition, 6.2 Markings on packaging has been added.
b) Clause 3 Quality assurance procedures and Annex A have been deleted.
c) 4.3.6.3 Returning force has been added.
d) 4.3.6.4 Travel (movement of the actuator) has been added.
e) 4.12 Environmental testing:
4.12.1.3 and 4.12.1.5 have been renumbered 4.12.2 and 4.12.3, respectively. 4.12.1.4 and 4.12.1.7 have been integrated in 4.12.5. 4.12.10 Salt mist has been added.
f) Following publication of IEC 61058-1-1:2016, some cross-references to IEC 61058-1 have been updated.
g) The following items have been updated with respect to the second edition.
- Tables and figures:
Tables 1 and 3 have been deleted, Table 4 has been renumbered to Table 10. New Tables 2, 3, 4, 5, 6, 7, 8 and 9 have been added.
Figure 1 has been renumbered to Figure 3, Figure 2 renumbered to Figure 4, Figure 3 renumbered to Figure 9 and Figure 4 renumbered to Figure 12. Added new Figures 1, 2, 5, 6, 7, 8, 10 and 11 have been added.
- Specific words and common names have been unified.

Interrupteurs électromécaniques pour équipements électriques et électroniques - Partie 1: Spécification générique

L’IEC 61020-1:2019 spécifie la terminologie, les symboles, les méthodes d’essai et d’autres informations nécessaires pour assurer la cohérence des spécifications particulières applicables aux interrupteurs électromécaniques.
Le présent document concerne les interrupteurs électromécaniques destinés à être utilisés dans les dispositifs électriques et électroniques. Les interrupteurs relevant du présent document:
- sont des dispositifs qui ouvrent, ferment ou commutent un circuit par le mouvement mécanique de leurs parties conductrices (contacts);
- ont une tension assignée maximale de 480 V;
- ont un courant assigné maximal de 63 A. Cette troisième édition annule et remplace la deuxième édition parue en 2009.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) Conformément aux Directives ISO/IEC, Partie 2:2016, l’Article 2, Généralités, a été remplacé par deux nouveaux articles: l’Article 2, Références normatives, et l’Article 3, Termes, définitions, unités et symboles.
Les paragraphes 2.4, Valeurs privilégiées, et 2.5, Marques et indications, ont été déplacés respectivement aux Articles 5 et 6. En outre, le paragraphe 6.2, Marquage sur l’emballage, a été ajouté.
b) L’Article 3, Procédure d’assurance de la qualité, ainsi que l’Annexe A, ont été supprimés.
c) Le paragraphe 4.3.6.3, Force de retour, a été ajouté.
d) Le paragraphe 4.3.6.4, Course (mouvement de l’organe de commande), a été ajouté.
e) 4.12, Essais d’environnement:
4.12.1.3 devient 4.12.2, et 4.12.1.5 devient 4.12.3. Les paragraphes 4.12.1.4 et 4.12.1.7 ont été intégrés au paragraphe 4.12.5. Le paragraphe 4.12.10, Brouillard salin, a été ajouté.
f) Suite à l'édition de l’IEC 61058-1-1:2016, les numéros des renvois à l’IEC 61058-1-1 ont été mis à jour.
g) Les points suivants ont été mis à jour par rapport à la deuxième édition.
- Tableaux et figures:
Les Tableau 1 et Tableau 3 ont été supprimés, le Tableau 4 devient le Tableau 10. Les Tableaux 2, 3, 4, 5, 6, 7, 8 et 9 ont été ajoutés.
La Figure 1 devient la Figure 3, la Figure 2 devient la Figure 4, la Figure 3 devient la Figure 9 et la Figure 4 devient la Figure 12. Les Figures 1, 2, 5, 6, 7, 8, 10 et 11 ont été ajoutées.
- Les termes spécifiques et des noms courants ont été uniformisés.

General Information

Status
Published
Publication Date
15-Jan-2019
Current Stage
PPUB - Publication issued
Completion Date
16-Jan-2019
Ref Project

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IEC 61020-1
Edition 3.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electromechanical switches for use in electrical and electronic equipment –
Part 1: Generic specification
Interrupteurs électromécaniques pour équipements électriques et électroniques –
Partie 1: Spécification générique
IEC 61020-1:2019-01(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61020-1
Edition 3.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electromechanical switches for use in electrical and electronic equipment –
Part 1: Generic specification
Interrupteurs électromécaniques pour équipements électriques et électroniques –
Partie 1: Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.220.20 ISBN 978-2-8322-6388-4

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61020-1:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 6

INTRODUCTION ..................................................................................................................... 8

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms, definitions, units and symbols ............................................................................ 11

3.1 Terms and definitions ............................................................................................ 11

3.2 Units and symbols................................................................................................. 13

4 Test and measurement procedures ................................................................................ 14

4.1 General ................................................................................................................. 14

4.1.1 General requirements to tests and measuring procedures ............................. 14

4.1.2 Tolerances .................................................................................................... 14

4.1.3 Preconditioning .............................................................................................. 14

4.1.4 Mounting ....................................................................................................... 14

4.2 Standard atmospheric conditions .......................................................................... 14

4.3 General examination ............................................................................................. 15

4.3.1 Visual examination ........................................................................................ 15

4.3.2 Dimensions .................................................................................................... 15

4.3.3 Dimensions, gauging ..................................................................................... 16

4.3.4 Mass ............................................................................................................. 16

4.3.5 Functional operation ...................................................................................... 17

4.3.6 Operating characteristics ............................................................................... 17

4.3.7 Contact bounce ............................................................................................. 21

4.4 Resistance measurements .................................................................................... 23

4.4.1 Contact resistance – Millivolt level ................................................................. 23

4.4.2 Contact resistance – Specified current ........................................................... 26

4.4.3 Resistance from actuator to mounting bushing (surface) ................................ 27

4.4.4 Insulation resistance ...................................................................................... 28

4.5 Withstand voltage ................................................................................................. 29

4.5.1 Withstand voltage at standard atmospheric conditions ................................... 29

4.5.2 Withstand voltage at low air pressure ............................................................ 30

4.6 Heating ................................................................................................................. 31

4.6.1 Object ............................................................................................................ 31

4.6.2 Method .......................................................................................................... 31

4.6.3 Requirement .................................................................................................. 31

4.6.4 Items to be specified in the detail specification .............................................. 31

4.7 Dynamic stress ..................................................................................................... 32

4.7.1 Shock ............................................................................................................ 32

4.7.2 Vibration ........................................................................................................ 32

4.7.3 Contact disturbance ....................................................................................... 33

4.8 Mechanical strength .............................................................................................. 34

4.8.1 Robustness of actuator .................................................................................. 34

4.8.2 Robustness of mounting bushing ................................................................... 37

4.8.3 Robustness of screw mounting ...................................................................... 37

4.8.4 Robustness of terminations ........................................................................... 37

4.9 Mechanical endurance .......................................................................................... 38

4.9.1 Mechanical endurance – Standard atmospheric conditions ............................ 38

4.9.2 Mechanical endurance – Category temperature range ................................... 39

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IEC 61020-1:2019 © IEC 2019 – 3 –

4.10 Electrical endurance ............................................................................................. 40

4.10.1 Electrical endurance – Standard atmospheric conditions ............................... 40

4.10.2 Electrical endurance – Upper category temperature ....................................... 42

4.10.3 Electrical endurance – Category temperature range ...................................... 43

4.10.4 Electrical endurance – low air pressure ......................................................... 43

4.10.5 Logic loads (TTL)........................................................................................... 44

4.10.6 Low level endurance test ............................................................................... 45

4.11 Overload ............................................................................................................... 46

4.11.1 Electrical overload ......................................................................................... 46

4.11.2 Capacitive load switching .............................................................................. 47

4.12 Environmental testing ........................................................................................... 48

4.12.1 Climatic sequence ......................................................................................... 48

4.12.2 Dry heat ........................................................................................................ 50

4.12.3 Cold............................................................................................................... 51

4.12.4 Damp heat, steady state ................................................................................ 53

4.12.5 Damp heat, cyclic .......................................................................................... 54

4.12.6 Rapid change of temperature ......................................................................... 56

4.12.7 Mould growth (resistance) .............................................................................. 57

4.12.8 Corrosion, industrial atmosphere ................................................................... 58

4.12.9 Dust and sand ............................................................................................... 62

4.12.10 Salt mist ........................................................................................................ 64

4.12.11 Contact resistance stability ............................................................................ 65

4.13 Soldering .............................................................................................................. 66

4.13.1 Solderability, wetting, solder bath method ...................................................... 66

4.13.2 Solderability, wetting, soldering iron method .................................................. 67

4.13.3 Solderability, dewetting .................................................................................. 68

4.13.4 Resistance to soldering heat, solder bath method .......................................... 68

4.13.5 Resistance to soldering heat, soldering iron method ...................................... 69

4.14 Panel seal ............................................................................................................. 70

4.14.1 General ......................................................................................................... 70

4.14.2 Drip – Proof ................................................................................................... 70

4.14.3 Splash – Proof ............................................................................................... 70

4.14.4 Immersion...................................................................................................... 71

4.14.5 Submersion ................................................................................................... 72

4.15 Enclosure seal ...................................................................................................... 73

4.15.1 General ......................................................................................................... 73

4.15.2 Watertight immersion ..................................................................................... 73

4.15.3 Resilient or hermetic seal .............................................................................. 74

4.16 Fluid resistance – Immersion in cleaning solvents (marking) ................................. 74

4.16.1 Object ............................................................................................................ 74

4.16.2 Method .......................................................................................................... 74

4.16.3 Requirement .................................................................................................. 75

4.16.4 Items to be specified in the detail specification .............................................. 75

4.17 Fire hazard ........................................................................................................... 75

4.18 Capacitance .......................................................................................................... 75

4.18.1 Object ............................................................................................................ 75

4.18.2 Method .......................................................................................................... 75

4.18.3 Requirement .................................................................................................. 75

4.18.4 Items to be specified in the detail specification .............................................. 75

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– 4 – IEC 61020-1:2019 © IEC 2019

4.19 Illumination ........................................................................................................... 76

4.19.1 Chromaticity .................................................................................................. 76

4.19.2 Transmittancy ................................................................................................ 76

4.19.3 Temperature of illuminated surface ................................................................ 77

4.20 Soldering for surface mounting switches ............................................................... 77

4.20.1 Solderability, solder bath method (surface mounting switches) ...................... 77

4.20.2 Solderability, reflow method (surface mounting switches) .............................. 78

4.20.3 Solderability, soldering iron method (surface mounting switches) ................... 79

4.20.4 Resistance to soldering heat, solder bath method (surface mounting

switches) ....................................................................................................... 80

4.20.5 Resistance to soldering heat, reflow method (surface mounting switches) ..... 80

4.20.6 Resistance to soldering heat, soldering iron method (surface mounting

switches) ....................................................................................................... 81

4.21 Mechanical strength (surface mounting switches) ................................................. 82

4.21.1 Substrate bending (surface mounting switches) ............................................. 82

4.21.2 Pull-off and push-off (surface mounting switches) .......................................... 82

4.21.3 Shear (surface mounting switches) ................................................................ 83

4.21.4 Body strength (surface mounting switches) .................................................... 84

5 Preferred values ............................................................................................................ 84

5.1 General ................................................................................................................. 84

5.2 Clearance and creepage distances ....................................................................... 84

6 Marking ......................................................................................................................... 85

6.1 Markings on switch body ....................................................................................... 85

6.2 Markings on packaging ......................................................................................... 85

Bibliography .......................................................................................................................... 86

Figure 1 – Measuring direction of operating force and torque ................................................ 18

Figure 2 – Example of measuring points specified in detail specifications ............................. 20

Figure 3 – Contact bounce test circuit ................................................................................... 22

Figure 4 – Typical trace of contact bounce ............................................................................ 22

Figure 5 – Low voltage and current method (by DC) ............................................................. 25

Figure 6 – Low voltage and current method (by AC) .............................................................. 25

Figure 7 – Specified current method (by DC) ........................................................................ 27

Figure 8 – Specified current method (by AC) ......................................................................... 27

Figure 9 – Application of forces and torques for 4.8.1 ........................................................... 36

Figure 10 – Composition of one cycle ................................................................................... 56

Figure 11 – Composition of cycle of test procedure ............................................................... 63

Figure 12 – Submersion seal enclosure ................................................................................ 73

Table 1 – Torque values for mounting screws ....................................................................... 37

Table 2 – Climatic sequence ................................................................................................. 49

Table 3 – ......................................................................................................... 49

Remain cycles

Table 4 – Concentration of H S ............................................................................................ 59

Table 5 – Test temperature ................................................................................................... 59

Table 6 – Test duration ......................................................................................................... 59

Table 7 – Concentration of SO ............................................................................................ 61

---------------------- Page: 6 ----------------------
IEC 61020-1:2019 © IEC 2019 – 5 –

Table 8 – Test temperature ................................................................................................... 61

Table 9 – Test duration ......................................................................................................... 61

Table 10 – Solderability, bath method: Test severities (duration and temperature) ................ 67

---------------------- Page: 7 ----------------------
– 6 – IEC 61020-1:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMECHANICAL SWITCHES
FOR USE IN ELECTRICAL AND ELECTRONIC EQUIPMENT –
Part 1: Generic specification
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

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rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61020-1 has been prepared by subcommittee 23J: Switches for

appliances, of IEC technical committee 23: Electrical accessories.
This third edition cancels and replaces the second edition published in 2009.

This edition includes the following significant technical changes with respect to the previous

edition:

a) In accordance with the ISO/IEC Directives, Part 2:2016, Clause 2 General has been

replaced by two new clauses: Clause 2 Normative references and Clause 3 Terms,
definitions, units and symbols.

2.4 Preferred values and 2.5 Marking have been moved to Clauses 5 and 6. In addition, 6.2

Markings on packaging has been added.
b) Clause 3 Quality assurance procedures and Annex A have been deleted.
c) 4.3.6.3 Returning force has been added.
d) 4.3.6.4 Travel (movement of the actuator) has been added.
e) 4.12 Environmental testing:
---------------------- Page: 8 ----------------------
IEC 61020-1:2019 © IEC 2019 – 7 –

4.12.1.3 and 4.12.1.5 have been renumbered 4.12.2 and 4.12.3, respectively. 4.12.1.4 and

4.12.1.7 have been integrated in 4.12.5. 4.12.10 Salt mist has been added.

f) Following publication of IEC 61058-1-1:2016, some cross-references to IEC 61058-1 have

been updated.
g) The following items have been updated with respect to the second edition.
– Tables and figures:
Tables 1 and 3 have been deleted, Table 4 has been renumbered to Table 10. New
Tables 2, 3, 4, 5, 6, 7, 8 and 9 have been added.

Figure 1 has been renumbered to Figure 3, Figure 2 renumbered to Figure 4, Figure 3

renumbered to Figure 9 and Figure 4 renumbered to Figure 12. Added new Figures 1, 2,

5, 6, 7, 8, 10 and 11 have been added.
– Specific words and common names have been unified.
The text of this International Standard is based on the following documents:
CDV Report on voting
23J/443/CDV 23J/448/RVC

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61020 series, published under the general title Electromechanical

switches for use in electrical and electronic equipment, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 9 ----------------------
– 8 – IEC 61020-1:2019 © IEC 2019
INTRODUCTION

This document covers the general requirements and test methods for electromechanical

switches with optional quality assurance procedures. It provides the general requirements and

test methods for use in any detail specifications for pushbutton switches, rotary switches,

sensitive switches, toggle switches, and other electromechanical switches.
Where it is intended that an electromechanical switch
...

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