Main parameters of molded case circuit breaker

Main parameters
⑴ Rated voltage
The rated voltage on the nameplate of the circuit breaker refers to the rated voltage of the main contact of the circuit breaker, which is the voltage value to ensure the long-term normal operation of the contact of the contactor< Br>(2) Rated current
The rated current on the nameplate of the contactor refers to the rated current of the main contact of the circuit breaker, which is the current value to ensure the long-term normal operation of the contactor contact< Br>⑶ Tripping current
The tripping current is the current setting value that makes the overcurrent release act. When the circuit is short circuited or the load is seriously overloaded, and the load current is greater than the tripping current, the main contact of the circuit breaker will break< Br>⑷ Overload protection current and time curve
Overload protection current and time curve are inverse time characteristic curves. The greater the overload current, the shorter the action time of the thermal release< Br>⑸ The rated voltage of the undervoltage release coil must be equal to the rated voltage of the line< Br>(6) The rated voltage of the shunt release coil must be equal to the control power supply voltage< Br>(7) Rated ultimate short-circuit breaking capacity Icu
There are two kinds of breaking capacity indicators of circuit breakers: rated ultimate short-circuit breaking capacity Icu and rated operating short-circuit breaking capacity Ics< Br>(8) Current limiting breaking capacity
Current limiting breaking capacity refers to the ability to limit fault current when the circuit breaker trips in case of short circuit< Br>(9) Tripping characteristics of miniature circuit breaker