Siemens 3VA1225-6GF42-0HH0 — 250 A SENTRON MCCB, 4-Pole, Line Protection
The Siemens 3VA1225-6GF42-0HH0 is a SENTRON molded case circuit breaker (MCCB) rated at 250 A continuous, four-pole construction, designed for line protection in distribution and industrial power panels. Breaking capacity hits 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 covers fault-current duty from low-voltage service entrances up to 690 V motor control centers without cascading upstream.
Thermal Derating and Power Loss
Rated 250 A from 40 °C through 50 °C ambient; above that it derates in 5 °C steps: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. Maximum power loss is 57 W — that matters for enclosure heat rise calculations when the panel is fully populated.
Auxiliary and Release Configuration
Shipped with a shunt trip (STL) release and two auxiliary switches plus one trip alarm switch (HQ). No undervoltage release fitted from the factory. No ground-fault monitoring version. The auxiliary switch design is 2 auxiliary switches + 1 trip alarm switch HQ.
Dimensions and Mounting
Footprint: 140 mm wide × 158 mm high × 70 mm deep. That 70 mm depth is the body-only — verify clearance for the shunt trip and auxiliary wiring when laying out the DIN-rail or backplate. Four-pole width at 140 mm is standard for this frame size; check adjacent device spacing for heat dissipation.