1SAM340000R1014

ABB 1SAM340000R1014, model MS132-25T, is a 3-pole circuit breaker for primary-side transformer protection. It is designed to protect control transformers against overload and short-circuit conditions while accommodating the relatively high inrush current that occurs when transformers are energized. The MS132-25T has an adjustable current setting range of 20–25 A and an instantaneous short-circuit trip setting of 500 A. ABB specifies that transformer protection breakers should be selected so that the transformer’s primary current lies within the breaker’s adjustable current range.