A thermal overload relay is a device used to protect type 3 motors from overloads. Thus, it is responsible for monitoring the current in the receiver placed downstream on the motor while protecting it against phase cuts.
How does a thermal overload relay work?
Its operation is simple. Indeed, it does not act directly on the power circuit. However, one of its contacts will open the control circuit of a contactor which will cut the current in the receiver. This is why it is always associated with a contactor. Now that you know what a thermal overload relay is, discover the Schneider thermal overload relay.
The Schneider thermal overload relay
Schneider TeSys thermal overload relays are part of the composition of starting solutions for type 3 motors. Composed of a magnetic circuit breaker, a contactor and a relay, this motor is well protected. Indeed, the magnetic circuit breaker protects it against short circuits, the contactor performs the command and the relay protects it against overloads. Thus, at Schneider, there are 2 types of thermal relays:
- Equipped with an electromechanical bimetal device, the first category of Schneider thermal relays reacts when the increase in the current absorbed by the motor is small and abnormal. With this system, the peak intensity carried out at startup is supported without causing tripping.
- The second category of Schneider relays concerns electronic thermal relays with bimetallic strip substituted by an electronic system which offers more effective protection and has different specific functions.
Schneider, thanks to its thermal relays, allows all TeSys contactors to have a suitable connection mode. You can therefore obtain your Schneider thermal relay online.