当电路出现故障使回路电流增大时，过载保护PT C热敏电阻的电阻值因自热温升而出现阻值阶跃，直至把电路切断。
When the circuit breaks down and the return circuit current increases, the resistance of restricting overloading protection PTC Thermistor goes up sharply for being warm, until the circuit is cut off.
安全开关保护装置，当马达过载或单向运转时，安全开关会自动切断电源。
C. safety switch protection device, when the motor is overloaded or when one-way operation, the safety switch will automatically cut off the power supply.
并联跳闸装置- - -一旦控制装置监测到故障发生或电流过载，将自动切断所有连接热水器的所有电源，最大限度保护热水器。
Shunt trip disconnecter - provides maximum protection by interrupting all power to the system in the event of a control sensed malfunction or overcurrent.
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