Single Phase Solid State Relay

The function of the thermal relay is that when the three-phase AC has abnormal conditions such as long-term operation under load and undervoltage, long-term overload operation, and long-term single-phase operation, it will cause severe overheating of the motor winding and even burn it out. In order to give full play to the overload capacity of the motor, Guarantee the normal start and operation of the motor, and when the motor is overloaded for a long time, it can automatically cut off the circuit, and the relay-thermal relay, which can change the action time with the degree of overload, can not be used for instantaneous overload protection and short-circuit protection.
According to the number of phases: single-phase, two-phase, three-phase
According to function: without phase failure protection, with phase failure protection
Working principle: The circuit is heated due to long-term overload, and the heating element is connected in series with the motor circuit, and the bimetal sheet is heated and bent to drive the contact action.