Schneider Electric's Square D B22 Thermal Overload Relay is a plug-on thermal protection device for motors, rated for 12–18 A and designed to mount directly on compatible B22-frame contactors. It uses a built-in heater element to detect overload conditions and trip the circuit to protect the motor from damage. This compact relay is intended for industrial motor applications requiring reliable overload protection on 12–18 A loads.
