That 250 A holds flat from 40 °C to 50 °C, then derates to 223 A at 70 °C — so in a warm enclosure near the top of a packed panel, you still have most of your headroom. The interrupting ratings climb steeply as voltage drops: 187 kA at 240 V, 121 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V. The 4-pole design with 100% N-conductor protection means it opens all phases and the neutral together — no floating neutral after a trip. The TM240 release is thermal-magnetic, so it handles overloads with a time curve and short circuits magnetically. The undervoltage release (UVR) will drop the breaker if supply voltage falls below the dropout threshold, which is useful for preventing a motor from re-accelerating after a sag. The auxiliary contact order code is 3VA9608-0BB25 if you need a spare. Front IP40 keeps out tools and fingers but isn't rated for washdown — keep it inside the enclosure, not on the machine frame.
The IP40 front means the handle and trip indicator are accessible through a cutout, but the live terminals stay behind the door or cover.