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