主开关能够提供过电流保护，是配电盘或设备的电源断开点。

Main breakers provide overcurrent protection and a single disconnect point for all power in a switchboard or device.

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PTC陶瓷片设计保护温度，当温度超过设定温度时，PTC陶瓷片内部就会自动断开电源。

PTC ceramic chip designed to protect the temperature, when the temperature exceeds the set temperature, the PTC ceramic chip will automatically disconnect the power supply.

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PTC陶瓷片设计保护温度，当温度超过设定温度时，PTC陶瓷片内部就会自动断开电源。

PTC ceramic chip designed to protect the temperature, when the temperature exceeds the set temperature, the PTC ceramic chip will automatically disconnect the power supply.

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