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Key Features Of Circuit Breakers

Dec 18, 2018

The main characteristics of circuit breaker are: RATED voltage UE; rated current in; overload protection (IR or Irth) and short-circuit protection (IM) Buckle current tuning range; rated short-circuit sub-power flow (industrial circuit breaker ICU; household circuit breaker ICN), etc.

Rated operating voltage (UE): This is the voltage at which the circuit breaker works under normal (uninterrupted) conditions.

Rated current (in): This is the maximum current value that a circuit breaker with a special overcurrent buckle relay can withstand indefinitely at the ambient temperature specified by the manufacturer and does not exceed the temperature limit specified by the current bearing part.

Short-circuit relay buckle Current tuning value (IM): short-circuit buckle relays (instantaneous or short delay) are used when high fault current values appear, allowing the circuit breaker to trip quickly, its tripping limit Im. Rated short-circuit breaking capacity (ICU or ICN): The circuit breaker's rated short-circuit break current is the highest (expected) current value that the circuit breaker can break without being compromised. The current value provided in the standard is the mean square root value of the fault current AC component, and the DC transient component (which always appears in the worst case short circuit) is assumed to be zero when the standard value is calculated. Industrial Circuit Breaker Ratings (ICU) and household circuit breaker ratings (ICN) are usually given in the form of ka mean square root values.