总有一个断电器以防止仪器超负荷运转。

There is always an internal circuit breaker to protect the instrument from overload.

《柯林斯英汉双解大词典》

在维修保养电器设备之前，必须先切断电源。

Shut off power before working and servicing on electrical equipment or circuits.

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把电器插头插在电源板上，方便切断电源。

Put them on power strips to make them easier to shut off.

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切断电源，锁好电器箱。

Turn off the power and lock the electrical appliance box.

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切断电源，锁好电器箱。

Turn off the power and lock the electrical appliance box.

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