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The standard defines two utilization categories, A and B; depending on breaker discrimination with upstream breakers under short-circuits 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.
Compact NSX100 to 630 circuit breakers are category A, however, by design, they provide discrimination with downstream devices (see the Complementary technical information guide)