What this MCCB delivers
The Siemens 3VA2225-5JP32-0KL0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a 3-pole configuration and an ETU550 electronic trip unit. It carries a 187 kA interrupting capacity at 240 V and 121 kA at 415 V — numbers that tell you it handles high-fault utility feeds or transformer secondaries without cascading upstream. The 800 V rated insulation voltage (Ui) confirms it is built for 690 V industrial distribution panels.
Ratings that decide the fit
The 250 A rating holds flat from 40 °C to 50 °C, then derates to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If your panel ambient runs above 50 °C, the effective current is lower than the nameplate — plan the load accordingly. The interrupting curve drops from 187 kA at 240 V to 121 kA at 415/440 V, then 79 kA at 500 V, and 5.1 kA at 690 V. At 690 V the breaker still clears faults, but the available fault current must stay under 5.1 kA.
Built-in auxiliaries and releases
This version ships with a shunt trip (STL) release and a full auxiliary contact block: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ designation). A voltage trigger is present, and the trip indicator gives a local visual flag after a fault. The ETU550 electronic overcurrent release provides adjustable LSI protection curves — suitable for selective coordination in a distribution board.
Panel fit and integration
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard 3-pole MCCB footprint that fits most 600 V switchboard buckets and DIN-rail adapters. The 48 W maximum power loss at rated load means ventilation slots in the enclosure should be clear; stacking multiple breakers in a closed cabinet requires a thermal calculation.