A three-alarm phase circuits

As shown in (a), KAi, KA2, KA3 intermediate relay, connected to the outlet end of the low-voltage circuit breakers total. Alarm circuit connected to the backup power supply or

battery power supply. The circuit can not only play the role of the police power phase, and can always breaker tripping low-voltage gate. KV circuit breaker QF loss of pressure coil.

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