What this MCCB is and what it does
The Siemens 3VA2225-6KP32-0BL0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with an adjustable thermal-magnetic trip unit covering 375 A to 2500 A — so it protects feeders and large motor loads where the fault current can reach 242 kA at 240 V or 187 kA at 415 V. It is a 3-pole unit designed for line protection, meaning it sits at the main distribution point or on a heavy branch feeder, not on a final subcircuit.
Ratings that decide fit
The interrupting capacity drops from 242 kA at 240 V to 187 kA at 415/440 V, then to 121 kA at 500 V, and finally to 4.5 kA at 690 V — the 690 V figure is low enough that you need to verify the available fault current at that voltage before specifying. Continuous current derates with ambient temperature: it holds 250 A up to 50 °C, then steps down to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C — so in a hot panel you lose 20 % of the rating. The adjustable trip range (375–2500 A) means you can set the magnetic pickup to coordinate with downstream devices without changing the breaker frame.
Panel integration and auxiliaries
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard MCCB footprint that fits most DIN-rail or panel-mount enclosures without special adapters. It ships with an undervoltage release (UVR) and a full auxiliary switch block: 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ, so you get status feedback and shunt-trip capability without adding external relays. A communication function is built in — this variant supports remote monitoring and control, which saves wiring on a distributed line-up.
Lifecycle and sourcing
Maximum power loss is 50.5 W, so factor that into the enclosure thermal budget if you are grouping several breakers. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C — the storage limit governs handling, not running.