What this MCCB does — and the ratings that decide fit
The Siemens 3VA2225-5KP32-0HL0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 250 A continuous current (Iu) at 40 °C, with a 3-pole configuration and an electronic trip unit (ETU850). The interrupting rating hits 187 kA at 240 V AC, dropping to 121 kA at 415 V and 440 V, 79 kA at 500 V, and 5.1 kA at 690 V. Communication function is onboard, meaning it can integrate with a BMS or SCADA system for power monitoring and remote tripping. The thermal derating curve is published: 250 A continuous up to 50 °C, then 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. Maximum power loss is 48 W per pole — a consideration for ventilation in a sealed enclosure.
The 105 mm width is a 4-module (4 x 27 mm) form factor typical of 250 A frame MCCBs — plan for that slot width in the panel layout. The depth of 86 mm includes the handle and arc-chamber protrusion; allow clearance for cable bending radius and the shunt trip wiring. The auxiliary contact block (2 aux + 1 trip alarm + 1 electrical alarm) and the shunt trip (STL) are factory-integrated, so no field-assembly of those accessories is needed.