SENTRON 3VA1225-6GF42-0JC0 — 250 A MCCB for Line Protection
The Siemens SENTRON 3VA1225-6GF42-0JC0 is a 4-pole molded case circuit breaker (MCCB) rated for a continuous current Iu of 250 A, with a TM240 thermal-magnetic overcurrent release. It's configured for line protection — meaning it sits at the incoming feeder or main distribution point, not downstream branch protection. The interrupting ratings are substantial: 220 kA at 240 V, 154 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V, so it handles high-fault-capacity utility feeds without cascading upstream. The TM240 release is a fixed thermal-magnetic type — no interchangeable rating plugs, so the 250 A frame is locked at that trip curve. For ambient derating: the breaker holds 250 A from 40 °C through 50 °C, then steps down to 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C. If the panel ambient runs above 50 °C, you lose about 11% of the continuous rating by 70 °C — factor that into the load schedule. This unit includes a shunt trip (STL) auxiliary release for remote tripping, plus 2 auxiliary switches HQ (high-option) for status feedback to a PLC or annunciator panel. There is no undervoltage release, no ground-fault monitoring, no communication module, and no phase-failure detection — it's a straightforward main breaker with remote trip capability and contact status, not a smart breaker.
Integration — Panel Fit and Auxiliary Wiring
Dimensions: 70 mm deep, 140 mm wide, 158 mm high. That 140 mm width on a 4-pole frame is standard for SENTRON 3VA — it occupies the same footprint as other 250 A 4-pole variants in the series. The front face carries an IP40 protection rating, so it's suitable for enclosed panel mounting where no water jets or dust ingress are expected. The shunt trip coil (STL) and auxiliary switches are wired via the integrated terminal block; the auxiliary trip accessory order code is 3VA9688-0BL32 if you need a replacement or spare.