What this MCCB carries and what it means for your panel
The Siemens SENTRON 3VA2225-8HL32-0HL0 is a 3-pole molded case circuit breaker rated for 250 A continuous current, designed for line protection in distribution panels. The 440 kA breaking capacity at 240 V is the headline number — it tells you this breaker can safely interrupt fault currents up to that level without upstream cascading, which matters when you're coordinating downstream feeders in a high-fault installation. At 415 V and 440 V it still holds 330 kA, and at 690 V it's 52.5 kA, so the SCCR headroom stays substantial across common industrial voltages. The thermal derating curve is published: it holds the full 250 A up to 50 °C ambient, then steps down to 241 A at 55 °C and 213 A at 70 °C. That means in a warm enclosure — say a non-ventilated panel near a furnace line — you need to check the actual ambient against the curve before committing the BOM line. The maximum power loss is 48 W, which factors into your enclosure thermal budget.
Dimensions and panel fit
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep. That 86 mm depth is the dimension to check against your gland plate clearance or enclosure depth — it's the dimension that typically catches panel builders who assumed a shallower MCCB. The width of 105 mm is standard for a 3-pole SENTRON frame at this rating, so it occupies one 105 mm slot on the DIN rail or mounting plate.
Auxiliary and release configuration
This variant ships with 2 auxiliary switches plus 1 trip alarm switch and 1 electrical alarm switch (the HQ configuration), plus a shunt trip release (STL). That means it arrives ready for remote tripping and status feedback — no need to order separate aux blocks for basic signaling. The undervoltage release is absent on this order code, so if your safety circuit requires a UVR for undervoltage protection, this isn't the variant you want.