SRPS EN IEC 60947-5-8:2021

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

Scope

<!-- NEW! -->IEC 60947-5-8:2020 is available as <a href="https://webstore.iec.ch/publication/67455">IEC 60947-5-8:2020 RLV</a> which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.</br></br>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.

Related directives

NOTE: If the word "harmonized" (marked in green) is not found in the field with the name of the directive, it means that the European standard is not cited in the OJEU.

National regulations and standards