IEC 60255-149:2013 

Measuring relays and protection equipment - Part 149: Functional requirements for thermal electrical relays


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IEC 60255-149:2013 specifies minimum requirements for thermal protection relays. This standard includes specification of the protection function, measurement characteristics and test methodologies. The object is to establish a common and reproducible reference for evaluating dependent time relays which protect equipment from thermal damage by measuring a.c. current flowing through the equipment. Complementary input energizing quantities such as ambient, coolant, top oil and winding temperature may be applicable for the thermal protection specification set forth in this standard. This standard covers protection relays based on a thermal model with memory function.

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Additional information

Publication typeInternational Standard
Publication date2013-07-30
Available language(s)English/French
TC/SCTC 95 - Measuring relays and protection equipmentrss
ICS29.120.70 - Relays
Stability date  2022
File size1722 KB

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