Interrupting capacity of 187 kA at 240 V AC (121 kA at 415 V, 75.6 kA at 440 V) gives this breaker high-fault headroom for large transformer-fed panels or industrial services with stiff utility feeds. Current rating holds at 125 A up to 50 °C, then derates to 114 A at 70 °C — a 9 % drop from the 40 °C nameplate, which matters for tightly packed panels with elevated ambient.
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that drops into most SENTRON 3VA1 switchboard chassis and panel-mounted bases without re-drilling. Two HP auxiliary switches are built in, so you get status feedback for PLC or SCADA without adding external relay modules.