The ABB 1SDA054911R1 is an auxiliary contact block accessory designed to attach to compatible molded case circuit breakers (MCCBs) in the Tmax T series (frames T4, T5, and T6). It provides additional signaling and contact switching capability by offering multiple changeover contacts that reflect the breaker’s status and can be used for remote indication or control logic interlocking in electrical distribution and protection systems. This accessory is suitable for use with both AC and DC control voltages up to 250 V.
