Thermal Overload Relay

Thermal Overload Relays are designed to cut power to the motor in the event that it is drawing too much current from the supply for an extended time.  The Thermal Overload Relay has a normally closed contact which opens due to heat generated by excessive current flowing through the circuit. Thermal overloads have a small heating device that increases in temperature as the motor running current increases.

Thermal Overload Relays are suitable for customers from all industries who want to guarantee optimum inverse-time delayed protection of their electrical loads under normal starting conditions.  Our range of Siemens Thermal Overload Relays have been designed for the protection of Three-phase and Single-phase AC and DC Motors.  For any application we have the correct Thermal Overload Relay, are Relays are available in four physical sizes that vary in kW size and also current setting range.