ABB 1SDA073672R1 YO Shunt Opening Release

The ABB 1SDA073672R1 is a Shunt Opening Release (YO) designed for use with ABB SACE Emax 2 air circuit breakers (E1.2 through E6.2) and Tmax XT7/XT7M moulded case circuit breakers . Operating at a rated control voltage of 110–120 V AC/DC, this accessory enables remote electrical tripping of the circuit breaker, providing rapid and reliable opening of the breaker contacts upon receipt of an external control signal . The YO release is a critical component for implementing emergency stop functions, remote control schemes, and automated protection interlocks in industrial power distribution systems. When energized, the shunt opening release acts directly on the breaker's trip mechanism, forcing immediate contact separation independent of the trip unit's protection algorithms .