ABB Transformer circuit breaker

The circuit breaker for transformer protection MS132-0.25KT is a compact 45 mm width device designed to protect control transformers on the primary side. This device has a rated operational current of Ie = 0.25 A with push-in spring terminals. It allows fuseless protection against overload and short-circuit. The short-circuit current setting is fixed to 20 times the rated operational current to handle the high inrush current generated by transformers. The device allows manual connection and disconnection of the transformer from the mains thanks to its built-in disconnection function. The circuit breaker for transformer protection offers a rated service short-circuit breaking capacity of Ics = 100 kA at 400 VAC and trip class 10. Further features include temperature compensation, a trip-free mechanism, a rotary handle with a clear switch position indication, and a short circuit trip indicator. The handle is lockable to protect against unauthorized changes. Auxiliary contacts, signaling contacts, undervoltage releases, shunt trips, and terminal spacers are available as accessories.