What this MCCB is and what it handles
The Siemens 3VA2325-8HK32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C through 70 °C — no derating needed across that whole band, which is unusual for a compact frame. It's a 3-pole unit with an ETU340 electronic trip unit, designed for line protection in distribution panels. The breaking capacity hits 440 kA at 240 V and still delivers 330 kA at 415 V, so it handles high-fault utility feeds without cascading upstream.
Trip unit and protection logic
The ETU340 is an electronic trip unit with adjustable long-time, short-time, instantaneous, and ground-fault protection curves. That means you can coordinate this breaker downstream of a main and upstream of feeders without nuisance trips — something a thermal-magnetic unit can't match. Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems. Power loss at rated load is 37.5 W, which matters when you're stacking breakers in a closed panel and watching the heat budget.
Physical fit and panel integration
The case measures 248 mm tall, 138 mm wide, 110 mm deep. That 138 mm width is a standard 3-pole MCCB footprint — it'll drop into existing SENTRON 3VA switchboard mounting without re-drilling the backplate. IP40 on the front means it's protected against tools and solid objects larger than 1 mm; fine for a dry indoor panel, but keep it out of washdown areas. No undervoltage release or shunt trip fitted from the factory, so if you need those, they're add-on accessories.