THE CIRCUIT BRAKER BUILT IN MODULE FOR MANAGING FAIL OF THE NEUTRAL PHASE

摘要

PURPOSE: A neutral-line open-phase managing module mounted circuit breaker is provided to prevent the occurrence of fire due to leakage current and loss due to over-voltages by continuously supplying power for driving the trip coil of the circuit breaker. CONSTITUTION: An SCR1(210) is turned on or turned off according to the supply state of single phase power. A SCR2(220) conducts the single phase power to the ground. A trip coil(230) is driven to open the contact point of a circuit breaker. A SCR3(270) conducts the single phase power to a neutral line and turns off the SCR1. The application of a voltage from an RC delay circuit(240) to the gate terminal of the SCR2 is delayed due to electric potential generated in a resistance(R4).