What this 250 A MCCB carries — and where it sits
The Siemens SENTRON 3VA2225-5JQ42-0KL0 is a 4-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, with the same rating holding flat through 50 °C before derating to 238 A at 55 °C and 200 A at 70 °C. That flat thermal curve means you can load it to 250 A in a 50 °C panel without a derate factor — a real advantage when the enclosure runs warm from adjacent drives or transformers. Interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, then drops to 75.6 kA at 500 V and 4.5 kA at 690 V. The 121 kA at 415 V covers most industrial distribution panels fed by a 1 MVA transformer — you are not bumping into the fuse coordination limit on a standard 800 A switchboard feed. The ETU560 electronic trip unit handles line protection with adjustable pickup and delay curves, plus a shunt trip (STL) auxiliary release for remote or emergency-off tripping. Communication function is built in, so it can talk to a higher-level controller or BMS without an add-on module.
Footprint and panel fit
Dimensions are 181 mm high, 140 mm wide, 86 mm deep. The 140 mm width is the standard 4-pole MCCB footprint for this frame size. Rated insulation voltage is 800 V. Maximum power loss is 48 W.
Lifecycle and sourcing reality
The supplied basic switch is 3VA22255JQ420AA0 — that is the core breaker without the plug-in accessory base. The -0KL0 suffix adds the factory-fitted auxiliary contacts: 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch (HQ version). Ground-fault monitoring uses summation current formation on L + N, so it catches residual currents without a separate GFCI module.