Siemens 3VA2225-8HN32-0AA0 — 250 A SENTRON MCCB, Line Protection
The Siemens 3VA2225-8HN32-0AA0 is a SENTRON molded case circuit breaker (MCCB) configured for line protection, meaning it guards the feeder or bus against overload and short-circuit faults — not motor or generator protection. It is a 3-pole unit rated for 250 A continuous current at 40 °C. The breaker carries an ETU350 electronic trip unit, which provides adjustable long-time, short-time, instantaneous, and ground-fault protection curves. Its breaking capacity reaches 440 kA at 240 V AC, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V — figures that place it in the high-interrupting category for large distribution panels and industrial switchboards.
Ratings and what they mean for panel fit
The 250 A rating holds flat from 40 °C to 50 °C, then derates linearly to 213 A at 70 °C. If the breaker lives in a hot enclosure or next to other heat sources, use the 60 °C column (232 A) or 70 °C column (213 A) for your load calculation — not the nameplate 250 A. The rated insulation voltage is 800 V, and the maximum operating voltage is 690 V AC, so it is suitable for 400/480 V and 600/690 V class systems. Dimensions are 181 mm height, 105 mm width, 86 mm depth — a standard 3-pole MCCB footprint that fits most Siemens SENTRON mounting bases and panel cutouts. The front face carries IP40 protection, adequate for a closed panel door; no IP rating is stated for the sides or rear, so keep it inside a cabinet. Maximum power dissipation is 48 W at rated load — plan for that heat in your enclosure thermal budget. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.