THERMAL OVERLOAD RELAY parts with part number LRD22 are overload relays for Schneider TeSys LRD range contactor.  The TeSys D range contactor is designed to make a motor starter. Such overload relays can be used with TeSys D contactors with a capacity of 9 to 38 amps. Such thermal differential overload relays detect excessive currents in motor lines. When excessive current is detected, the overload relay operates with the contactor to cuts off the power to the motor. This reduces damage to engine parts. The overload relay can set the trip current in the range of 16 to 24 amps.