1SDA105063R1

The 1SDA105063R1 is a specialized key lock accessory manufactured by ABB for its high-performance SACE Tmax XT series of molded case circuit breakers (MCCBs). The official product name/catalog description is KLC XT5-XT6 KE.LO. RONIS EQ.B 1228 OPxB. It is an open-position key lock mechanical safety mechanism (KEY LOCK RONIS EQUAL FELLOW B IN OPEN). It ensures that the circuit breaker is securely locked in the OFF (Open) position, with the key remaining withdrawable exclusively when the circuit breaker is safely open.