What this 250 A MCCB carries — and what it doesn't
The Siemens 3VA2225-5JP32-0KC0 is a 3-pole SENTRON molded case circuit breaker rated for line protection at 250 A continuous current, holding that rating flat from 40 °C up to 50 °C before it starts to derate — at 55 °C it's 238 A, at 60 °C it's 225 A, at 65 °C it's 213 A, and at 70 °C it's 200 A. That means in a warm panel you lose headroom fast; if your load pulls 240 A and the enclosure sits at 55 °C, this breaker is already at its limit. Breaking capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 5.1 kA at 690 V. That 187 kA figure at 240 V is high — it handles transformer-secondary faults or high-capacity busway taps without needing a current-limiting fuse upstream. At 690 V the 5.1 kA is modest; if your system runs 690 V with high fault current, this isn't the breaker for that bus. The ETU550 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — it's a communicable trip unit, so you can pull event logs and settings over the integrated communication function. The shunt trip release (STL) is built in, and the auxiliary contact block is a 2-switch HQ version. No undervoltage release, no phase-failure detection, no ground-fault monitoring module on this variant — those are separate add-on options.
Panel fit — footprint and wiring
The 3VA2225-5JP32-0KC0 measures 105 mm wide, 181 mm high, and 86 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for this frame size. Maximum power loss is 48 W at rated current — that's the heat you need to vent. In a multi-breaker lineup, factor that into the enclosure's thermal budget; a sealed stainless box with no fan will cook the trip unit electronics if you stack several of these at full load.