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IEC 60947-5-8:2020

$43.55

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

Published By Publication Date Number of Pages
IEC 2020-08-12 54
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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.

IEC 60947-5-8:2020
$43.55