断路器和接触器应至少有一对备用触点以便向控制系统传送信号。
Breaker and contactor should have one pair of spare contacts so that signals can be sent to the control system.
周五的地震切断了各种控制系统和水泵的电力供应，而海啸又使备用发电机组无法工作。
The earthquake initiated a rapid shutdown of the reactors, but the disaster cut power to controls and pumps, and the tsunami disabled backup generators.
周五的地震切断了各种控制系统和水泵的电力供应，而海啸又使备用发电机组无法工作。
The earthquake initiated a rapid shutdown of the reactors, but the disaster cut power to controls and pumps, and the tsunami disabled backup generators.
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