The thermal element of the thermal overload relay is directly or through the current transformer connected to the motor circuit. Thermal overload relay action time and the relation of the size of the overload current according to the inverse time, therefore, its thermal characteristic is easy to cooperate with the thermal characteristics of the motor, but also has simple structure, low price, stable performance, convenient use, etc. When the motor is overloaded, the main bimetallic strip is heated to the action temperature, which makes the relay move, and the power circuit of the power failure motor is divided, so that the motor is not damaged by overload. Thermal overload relay can also be used for other electrical equipment to control the heating status of electrical appliances. Squirrel cage rotor motors and partial winding rotor motors still used thermal overload relay as protection of overload, break phase and current imbalance operation. 

Technical Data:

Maximum voltage: 600V AC,240VDC.

Overload relay (4 - pole 53A & 85A)