What the ratings mean for fit
The Siemens SENTRON 3VA2225-6HN32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a maximum breaking capacity of 242 kA at 240 VAC. That 242 kA figure at 240 V tells you this breaker is sized for high-fault locations — main distribution boards or large subfeeds where the available fault current is significant. At 415 V the interrupting rating drops to 187 kA, and at 690 V it falls to 4.5 kA, so the voltage-dependent curve governs where it can be applied without cascading upstream. The continuous current derates above 50 °C: still 250 A at 50 °C, then 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If the panel ambient runs above 50 °C, the load must be trimmed accordingly — a detail that often gets missed during BOM freeze. Designed for line protection (not motor or generator protection), this MCCB is the right choice for cable and busbar feeder protection in a distribution panel. The 3-pole construction covers three-phase systems. It carries no undervoltage release, no ground-fault monitoring, and no communication function — it's a straightforward thermal-magnetic or electronic-trip breaker with three auxiliary switches (HQ type) built in.
Physical fit and integration
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. The width is the critical dimension for multi-breaker panel layouts — 105 mm per pole set is standard for this frame class. The 86 mm depth fits standard distribution board depths; verify clearance for cable connections and arc-chute exhaust at the rear of the enclosure.