What this MCCB carries and where it lands
The Siemens SENTRON 3VA2225-5KP32-0KH0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, with an adjustable thermal-magnetic trip range from 375 A up to 2500 A — meaning you set the trip point to match the downstream conductor or load, not the breaker's own frame limit. Interrupting capacity runs 187 kA at 240 V, drops to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 4.5 kA at 690 V — so at typical 480 V distribution levels it clears faults well above most service-entrance requirements. This is a line-protection design (not motor-circuit-protector), with a built-in communication function and a shunt trip release (STL) for remote opening. The auxiliary switch configuration is two auxiliary contacts plus one trip-alarm switch HQ.
Derating and thermal reality
The 250 A rating holds from 40 °C through 50 °C. At 55 °C it derates to 238 A, at 60 °C to 225 A, at 65 °C to 213 A, and at 70 °C to 200 A — so in a warm panel or outdoor enclosure you must reduce the load or increase the breaker frame size accordingly. Maximum power loss is 48 W. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Footprint and panel fit
Dimensions are 105 mm wide (4.13 in), 181 mm tall (7.13 in), 86 mm deep (3.39 in). This is a standard SENTRON 3VA2 frame size — mounts on a DIN rail or panel-mount plate. The 86 mm depth (3.39 in) means it fits in most 200 mm deep enclosures with clearance for rear-mounted busbars or cable ducts.