| 摘要 |
PROBLEM TO BE SOLVED: To provide an unbalanced energizing display breaker which has low power consumption and is capable of discriminating an unbalanced condition with a simple circuit. SOLUTION: If the working current of the unbalanced energizing display breaker is larger than a predetermined level, reference, reference voltage is identified by a Zener diode ZD1, and comparators IC1, IC2 for comparing the voltage of a main circuit with the voltage of a voltage line under unbalancing are driven to turn on a light emitting diode if the unbalancing condition is kept. If the working current is smaller than the predetermined level, on the other hand, the Zener diode ZD1 will not be able to supply stable voltage, so that the comparators IC1, IC2 will not be driven to stop the detection circuit.
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