Main parameters of molded case circuit breaker

Main parameters
⑴ Rated voltage
The rated voltage on the circuit breaker nameplate refers to the rated voltage of the main contact of the circuit breaker, which is the voltage value that ensures the long-term normal operation of the contactor contact
(2) Rated current
The rated current on the contactor nameplate refers to the rated current of the main contact of the circuit breaker, which is the current value that ensures the long-term normal operation of the contactor contact
⑶ Tripping current
Tripping current is the set value of the current that causes the overcurrent release to operate. When the circuit is short circuited or the load is severely overloaded, and the load current is greater than the tripping current, the main contact of the circuit breaker will break
⑷ Overload protection current and time curve
Overload protection current and time curve are inverse time characteristic curves. The larger the overload current, the shorter the time for the thermal release to operate
The rated voltage of the undervoltage release coil must be equal to the rated voltage of the line
The rated voltage of the shunt release coil must be equal to the control power supply voltage
There are two types of breaking capacity indicators for circuit breakers: rated ultimate short-circuit breaking capacity Icu and rated operating short-circuit breaking capacity Ics
Current limiting and 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
The tripping characteristics of miniature circuit breaker