What this MCCB carries and what that means on the panel
The SENTRON 3VA1225-5GF42-0DC0 is a 4-pole molded case circuit breaker rated for 250 A continuous current, with a TM240 thermal-magnetic release and an undervoltage release fitted as standard. 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. That 187 kA figure at 240 V means this breaker can clear a massive fault without rupturing — important for transformer secondaries or bus-duct feeds where available fault current is high. 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. No communication module, no ground-fault monitoring, no phase-failure detection: this is a straightforward line-protection breaker, not a multifunction power monitor. 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. It ships with 2 HQ auxiliary switches (form C) for status feedback to a PLC or indication lamp. 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.
Mounting and integration
The breaker measures 140 mm wide, 158 mm high, and 70 mm deep. That 70 mm depth is the body only — add clearance for the undervoltage release coil and auxiliary switch wiring. It mounts on a standard DIN rail or can be screw-fixed to a backplate. The IP40 front means the handle and trip indicator are accessible through a cutout, but the live terminals stay behind the door or cover.