名词
中文翻译：通常关闭的接触器
同义词：
['normally closed switch', 'normally closed relay']
例句：
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1. The normally closed contactor is used to prevent the motor from overheating.
通常关闭的接触器用于防止电机过热。
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2. The normally closed contactor is a crucial component in the circuit breaker system.
通常关闭的接触器是电路断路器系统中的关键部件。
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3. The normally closed contactor ensures that the power supply remains stable during the operation of the device.
通常关闭的接触器确保设备在操作过程中电源稳定。