Circuit breaker utilisation category IEC 60947-2
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).