What the ratings mean for fit
The Siemens 3VA2325-6HN32-0AD0 is a SENTRON molded case circuit breaker (MCCB) for line protection in distribution panels. Its 250 A rating at 40 °C holds flat through 50 °C — no derating needed up to that point — then steps down to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. That means in a warm enclosure you lose about 10 % of capacity by 70 °C, so size the breaker for the actual ambient, not the nameplate. Breaking capacity is the headline: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. These are high-interrupting ratings for a 250 A frame — it clears a bolted fault at the main distribution board without cascading upstream. The ETU350 electronic trip unit gives adjustable long-time, short-time, and instantaneous protection curves, plus ground-fault capability if the optional module is added. Physical fit: 138 mm wide, 248 mm tall, 110 mm deep — standard 3-pole MCCB footprint for a 250 A frame. IP40 on the front means it's protected against tools and wires >1 mm, but not against water ingress; mount it inside a panel, not in a washdown zone.
Integration notes
The breaker ships with three auxiliary switches (HQ type) integrated — no separate add-on required for status feedback. The basic switch variant is 3VA2325-6HN32-0AA0; the auxiliary trip unit (3VA9608-0BB24) is a separate order. No undervoltage release, no voltage trigger, no communication module, no phase-failure detection on this version — if you need those, you're looking at a different option code. Power dissipation is 37.5 W maximum — account for that heat in the enclosure thermal calculation, especially if the panel is densely packed. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.