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  • No : 22341
  • Release Date : 2018/08/31 14:33
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Interrupting ratings

What does Icu mean? What does Ics mean?
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Answer

A circuit breaker must have interrupting ratings. These are classified as rated short-circuit breaking capacities in IEC 60947-2.e rated ultimate short-circuit breaking capacity (Icu) of a circuit breaker is verified with the sequence of operations; O - t - CO.The rated service short-circuit breaking capacity (Ics) of a circuit breaker is verified with the sequence of operations; O - t - CO - t - CO.
Where, the following symbols are used for defining the sequence of operations:
- O represents a breaking operation;
- CO represents a making operation followed, after the appropriate opening time, by a breaking operation:
- t represents the time interval between two successive short-circuit operations which is as short as possible but not less than 3 min.
Product Name
Molded Case Circuit Breakers
Series
WS-V
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