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IEC 60947-5-8:2020 ED2

Low-voltage switchgear and controlgear - Part 5-8: Control circuit devices and switching elements - Three-position enabling switches

Aug 12, 2020

General information

60.60     Aug 12, 2020

IEC

TC 121/SC 121A

International Standard

29.130.20  

English  

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Scope

IEC 60947-5-8:2020 specifies requirements for three-position enabling switches. These switches are used as components of enabling devices to provide signals that,
- when activated, allow machine operation to be initiated by a separate start control, and
- when de-activated,
-- initiate a stop function, and
-- prevent initiation of machine operation.
This second edition cancels and replaces the first edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- due to the increasing range of useful applications of three-position enabling switches, note of scope, operational characteristics and tests are reviewed;
- figures for example of devices incorporating enabling switch are added in Annex A;
- new Annex B for procedure to determine reliability data for the switch used in functional safety applications is added.

Life cycle

PREVIOUSLY

WITHDRAWN
IEC 60947-5-8:2006 ED1

NOW

PUBLISHED
IEC 60947-5-8:2020 ED2
60.60 Standard published
Aug 12, 2020

National adoptions

Low-voltage switchgear and controlgear - Part 5-8: Control circuit devices and switching elements - Three-position enabling switches

60.60   Standard published

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