What this MCCB is and what the ratings mean for your panel
The Siemens SENTRON 3VA1225-6GF42-0AD0 is a 4-pole molded case circuit breaker (MCCB) with a fixed 250 A rating, designed for line protection in distribution panels. The TM240 thermal-magnetic release means it's a fixed-trip unit — no interchangeable trip block — so what you see on the nameplate is what governs the overload and short-circuit protection. That 250 A holds all the way up to 50 °C ambient; above that it derates linearly to 223 A at 70 °C, which matters if this breaker sits in a crowded, hot enclosure. Interrupting capacity is where this breaker earns its keep in high-fault installations: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. That's a lot of headroom for most commercial and industrial service entrances — you're not going to run out of SCCR on a typical 480 V panel feed. Physical footprint is 70 mm deep by 140 mm wide by 158 mm tall — a standard 4-pole MCCB form factor that drops into SENTRON mounting bases without surprises. Power loss at full load is 57 W, so factor that into your enclosure thermal budget if you're stacking several breakers side by side.
Lifecycle and sourcing — still current, no obsolescence worry
This part carries a current lifecycle stage from Siemens — no phase-out, no last-time-buy notice. It's an active catalog item in the SENTRON 3VA family, so you're not hunting surplus or chasing a replacement. For a BOM line that needs this exact order code, the supply channel is standard distribution; availability and current pricing are confirmed at quote time against an RFQ.
Integration notes — what fits and what doesn't
The breaker ships with three auxiliary switches (HQ design) integrated, so you get status feedback without adding external contact blocks. No undervoltage release, no ground-fault monitoring, no communication module — this is a straight line-protection MCCB. If you need those options, you're looking at a different variant in the 3VA family. Insulation voltage is rated at 800 V, which covers 690 V systems with margin. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The 70 mm depth means it fits standard SENTRON mounting plates and busbar systems without clearance issues.