Phase loss alarm circuit 3a
Source: InternetPublisher:念慈菴 Keywords: Alarm circuit circuit breaker low voltage intermediate relay Updated: 2020/12/27
As shown in Figure (a), KAi, KA2, and KA3 are intermediate relays , connected to the outlet of the low-voltage main circuit breaker . The alarm circuit
is connected to the backup power supply or battery power supply. This circuit not only functions as a power phase loss alarm, but also trips the low-voltage main circuit breaker
. KV is the voltage loss coil of circuit breaker QF.
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