The ABB UXAB309300312 is a 10-auxiliary-contact block designed for the contactor-isolated Unimotor series. It provides additional signal or control switching capacity alongside the main contactor, typically used in motor control centers or panel-mounted drives where the contactor itself lacks enough auxiliary poles for status feedback, interlocking, or PLC inputs.
It is part of the Unimotor family, which covers contactor-isolated motor starters. The extra contacts are often wired to a PLC for remote monitoring or to a safety relay for redundant feedback.