Type C circuit breaker: it is mainly used for general impulse current devices, such as fluorescent lamps, gas discharge lamps and general electrical equipment circuits, with instantaneous tripping current of 7 ~10in;
D-type circuit breaker: it is mainly used for equipment with high impulse current, such as motors and other equipment with high starting current, and the instantaneous tripping current is 8~ 14IN.
key property
The characteristics of circuit breakers mainly include: rated voltage UE; Rated current in; Setting range of tripping current for overload protection (Ir or Irth) and short circuit protection (Im); Rated short-circuit breaking current (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 that the circuit breaker equipped with special over-current tripping relay can bear indefinitely at the ambient temperature specified by the manufacturer, and will not exceed the temperature limit specified by current-carrying components.
Short-circuit relay trip current setting value (Im): Short-circuit trip relay (instantaneous or short delay) is used to make the circuit breaker trip quickly when there is a high fault current value, and its trip limit is Im.