1SAM340000R1003

ABB 1SAM340000R1003, model MS132-0.4T, is a compact 3-pole circuit breaker designed specifically for primary-side transformer protection. It provides both overload and short-circuit protection, helping protect control transformers in industrial panels, automation systems and machine-control applications. ABB specifies this model with a current setting range of 0.25–0.40 A. The MS132-0.4T uses an adjustable overload setting and a fixed instantaneous short-circuit trip designed to handle transformer inrush current. For this model, ABB lists the instantaneous short-circuit setting at 8 A, which corresponds to approximately 20 times the rated operational current.