IEC-60947-8 › Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines

IEC-60947-8 - EDITION 2.0 - CURRENT
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IEC 60947-8:2021 specifies requirements for control units, which control a switching device in response to the PTC thermistors incorporated in rotating electrical machines and the industrial application.
This second edition cancels and replaces the first edition published in 2003, Amendment 1:2006 and Amendment 2:2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
  1. safety aspects related to:
  • general aspects;
  • limited energy circuits;
  • electronic circuits;
  1. alignment to IEC 60947-1:2020;
  2. wire break detection function;
  3. the term detector is replaced by thermistor;
  4. reference to IEC 60738-1-4.
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Document Number

IEC 60947-8 Ed. 2.0 b:2021

Revision Level

EDITION 2.0

Status

Current

Publication Date

July 1, 2021

Committee Number

121A