relay logic unit
... relay logic ==> 继电器逻辑 relay logic unit ==> 继电器逻辑元件 relay magnet ==> 继电器磁铁 ...
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继电器是保护系统的逻辑元件，它感知故障，并使断路器解扣电路带电和断路器打开触点。
Relays are the logic elements of a protection system which sense the fault and cause the circuit-breaker trip circuits to be energized and the breakers to open their contacts.
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