Its 4-pole construction covers three-phase plus neutral, with a TM240 thermal-magnetic trip unit that handles overloads and short-circuits up to 187 kA at 240 V, 121 kA at 415 V, and 36 kA at 440 V. Rated continuous current Iu sits at 250 A, and the breaker holds that rating from 40 °C through 50 °C ambient; it starts a gentle thermal derate above that — 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C. That derate curve matters when you're packing this into a warm enclosure or a high-ambient process area.
Integration into a panel or enclosure
A shunt trip release (STL) is integrated — design 3VA9688-0BL30 — for remote emergency-off or undervoltage tripping.
For a 250 A feeder on a 240 V system with high available fault current (say, near a large transformer), that rating means you don't need a current-limiting fuse upstream. Mechanical endurance is 15 000 operations — that's a standard figure for a molded-case breaker in line-protection service. It's not a switching device for frequent motor starts; it's the overcurrent protector for a feeder that sees occasional manual switching and fault events.