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Reference IEC 60255-149 ed1.0 withdrawn corrigendum
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Title Measuring relays and protection equipment - Part 149: Functional requirements for thermal electrical relays
Publication date 2013-07-30
Format, price
(Swiss francs)
and language
230.- 93 pages
230.- 1722 Kb
Abstract 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.
Technical Committee 95 - Measuring relays and protection equipment  RSS
ICS Codes
29.120.70 Relays
Replaced by
Stability date 2016
Work in progress
ProjectStage codeForecast publication date
No project under development--


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