It is specifically designed for motor protection duty, which means its trip curve and thermal-magnetic characteristics are calibrated to handle the inrush and overload profile of induction motors — not just a general-purpose distribution breaker.
Breaking capacity — what it means at the bus
This MCCB delivers 187 kA breaking capacity at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V.
Motor protection features
The trip indicator is not present, so a visual flag on the handle will not show; trip status must be read from the auxiliary contact block or the panel indication circuit. The breaker is designed to protect the motor, not the branch circuit — pair it with a separate feeder breaker upstream.
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep — a standard SENTRON 3VA frame size for 400 A. Maximum power loss is 63.5 W, which must be factored into the enclosure thermal budget — at full load, that heat needs to be vented or the internal ambient will climb above the 70 °C operating ceiling.