What this MCCB delivers for your line
The Siemens 3VA2225-7KP32-0KC0 is a SENTRON molded case circuit breaker rated for 250 A continuous current (Iu) across three poles, with an ETU850 electronic trip unit that gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves. The interrupting ratings are substantial: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 6.3 kA at 690 V — so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The 86 mm depth and 105 mm width fit standard MCCB panel footprints; the IP40 front rating means it's sealed against solid objects larger than 1 mm on the operator face, suitable for enclosed switchboards.
Thermal derating and real-world ampacity
This breaker holds its full 250 A rating up to 50 °C ambient. 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. If your panel runs hot — say, a packed enclosure near a furnace line — factor the 60 °C figure (225 A) for continuous load. The maximum operating temperature is 70 °C, storage range -40 °C to 80 °C.
Integrated accessories and communication
Factory-fitted with a shunt trip (STL) release for remote tripping and two HQ auxiliary switches for status feedback to a PLC or annunciator. The ETU850 trip unit supports communication functions — you can pull event logs, set thresholds, and monitor load current over a fieldbus gateway. No undervoltage release or phase-failure detection on this variant; those are separate accessory modules. The basic switch assembly is order code 3VA2225-7KP32-0AA0; the integrated auxiliary trip is 3VA9688-0BL33.