MCCB with high interrupting capacity for line protection
The Siemens SENTRON 3VA2225-6JP32-0HA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, with a shunt trip release for remote opening. Its interrupting capacity hits 242 kA at 240 V AC and 187 kA at 415 V AC, which means it can clear high-fault currents on a distribution bus without cascading upstream — critical for selective coordination in a plant main or feeder panel. The unit measures 105 mm wide by 181 mm tall by 86 mm deep, fitting standard panel cutouts for SENTRON 3VA frames.
Above that, it derates linearly: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 48 W.
Interrupting ratings: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V. The steep drop at 690 V (4.5 kA) is typical for an MCCB with a 250 A frame — the arc extinction limits at higher voltage. For a 480 V or 600 V class system, the 121 kA at 500 V gives ample headroom for most industrial services.