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
A three-alarm phase circuits - schematic

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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