The ABB UVR-1SDA063552R1 is a Shunt Trip Coil (also known as an Under-Voltage Release or Opening Release) for ABB's Molded Case Circuit Breakers (MCCBs). It is an electromechanical accessory that enables the remote tripping or opening of a compatible circuit breaker on command. It does NOT provide undervoltage protection; it simply triggers the breaker's opening mechanism when its coil is energized.