Thermal Overload Relay

A thermal relay works depending upon the above mentioned property of metals.

Thermal overload relay. Construction of thermal relay the construction of thermal relay is quite simple. If the motor pulls too much electricity for an extended period of time the relay may flip and cut the power to the motor to prevent damage. Reliable protection for motors. Easy to create starters.

These relays help to control the electrical current that goes to the motor to prevent it from overheating. A thermal overload relay is a small electromechanical device that protects motors from overheating. It is connected either directly to motor lines or indirectly through current transformers. It de energies the starter and stops the motor when excessive current is drawn.

The function of a thermal overload relay used in motor starter circuits is to prevent the motor from drawing excessive current which is harmful to motor insulation. The bimetallic strip gets heated up by the current directly or indirectly and when the current flow exceeds the set value it bends. The thermal overload relay can make up a compact starting solution together with contactors. The basic working principle of thermal relay is that when a bimetallic strip is heated up by a heating coil carrying over current of the system it bends and makes normally open contacts.

Thermal overload relay class 10 1 80 to 2 60a 690v lr2k0308 thermal overload relay class 10 1 80 to 2 60a 690v. They offer reliable protection for motors in the event of overload or phase failure.