IEC 60947-8:2003 ED1

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

Publication date:   May 27, 2003

General information

99.60 Withdrawal effective   Jul 28, 2021



TC 121/SC 121A Low-voltage switchgear and controlgear

International Standard

29.130.20   Low voltage switchgear and controlgear



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Specifies rules for control units, which perform the switching functions in response to the thermal detectors incorporated in rotating electrical machines according to IEC 60034-11, and the industrial application. It specifies rules for that type of system comprising a positive temperature coefficient (PTC) thermistor detector having particular characteristics, and its associated control unit. The PT100 detectors are covered by IEC 60751, where the resistor values are given according to the temperatures of the detector. The present rules lay down the characteristics of association of this particular positive temperature coefficient thermistor detector and its associated control unit (designated "Mark A detector" and "Mark A control unit"), when they are used in thermal protection systems. NOTE It is not possible to specify all the requirements for the operating characteristics of a control unit, as they are dependent on some aspects of the thermal detectors. Some aspects of the requirements of the thermal protector system can only be specified when account is taken of the characteristics of the rotating machine to be protected and the method of installation of the detector within the machine. For these reasons, for each characteristic it is necessary to specify who is responsible for stating the required values and who is responsible for compliance with the requirement and for carrying out any confirmatory test.

Life cycle


IEC 60947-8:2003 ED1
99.60 Withdrawal effective
Jul 28, 2021


Amended by
IEC 60947-8:2003/AMD1:2006 ED1

Amended by
IEC 60947-8:2003/AMD2:2011 ED1


IEC 60947-8:2021 ED2