Circuit breaker utilisation category IEC 60947-2

The standard defines two utilisation categories, A and B, depending on circuit breaker discrimination with upstream breakers under short-circuit conditions.
  • Category A. Circuit breakers not specifically designed for discrimination applications.

  • Category B. Circuit breakers specifically designed for discrimination, which requires a short time-delay (which may be adjustable) and a rated short-time withstand current in compliance with the standard.

PowerPact 125 to 600 A circuit breakers are category A, however, by design, they provide discrimination with downstream devices (see the Complementary technical information guide).

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