IEC 60947-5-8 Ed. 2.0 b:2020

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

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

PUBLISH DATE 2020
PAGES 54

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

IEC 60947-5-8:2020 is available as IEC 60947-5-8:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

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.
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