The interrupting capacity hits 121 kA at 240 V AC, 75.6 kA at 415 V, and 52.5 kA at 440 V — numbers that tell you this breaker is built for high-fault service entrances or sub-distribution where the available fault current is substantial.
The 101.6 mm width (4 in) and 70 mm depth (2.76 in) mean it occupies a standard MCCB footprint — no surprises when you slot it into an existing SENTRON or third-party distribution board.
At 55 °C it steps to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. That's a gentle slope — you don't lose a full breaker size until you're well above typical panel ambient. Maximum power loss is 10.8 W, which matters for thermal coordination in a sealed enclosure.