250 A MCCB with 242 kA interrupting capacity — what that means for your panel
The Siemens 3VA2225-6HL32-0KF0 is a SENTRON 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C ambient, with a full-load current rating that holds flat up to 50 °C before beginning a linear derating curve — 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. The interrupting rating is the headline here: 242 kA at 240 V AC, 187 kA at 415/440 V, 121 kA at 500 V, and 4.5 kA at 690 V. That 242 kA figure at 240 V is high for a 250 A frame — it means this breaker can interrupt a fault current up to 242,000 amps at that voltage without welding contacts or venting plasma into the panel. This is a line-protection design — not a motor-protective breaker with integrated overloads. It's meant for feeder and main breaker duty where you need high short-circuit withstand and selective coordination downstream. The 3-pole construction fits standard 3-phase distribution panels on a 105 mm wide footprint, 86 mm deep, 181 mm tall.
Built-in accessories — shunt trip and auxiliary switch
The shunt trip lets you drop the breaker from a PLC output, emergency-stop circuit, or fire-alarm panel without needing an external contactor. The auxiliary switch provides position feedback — N/O or N/C contacts that tell your control system whether the breaker is open or closed. The trip alarm switch signals only when the breaker has tripped on fault, not when manually opened. If you need remote metering or Modbus, you'd step up to the 3VA2 with communication option.