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Current limiting breaking capacity refers to the ability of a circuit breaker to limit the fault current when a short circuit occurs and the circuit breaker trips. When a short circuit occurs in the circuit, the contacts of the circuit breaker quickly open, generating an arc, which is equivalent to a rapidly increasing arc resistance in series in the line, thereby limiting the increase of fault current, reducing the electromagnetic, electric, and thermal effects of short-circuit current on the circuit breaker and electrical equipment, and extending the service life of the circuit breaker. The shorter the disconnection time of the circuit breaker, the better the current limiting effect, and the closer the Ics are to Icu.
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