The Siemens SENTRON 3VA2325-0HM42-0AA0 is a 4-pole molded case circuit breaker rated for 250 A continuous current, designed for line protection in industrial power distribution. It carries a 440 kA breaking capacity at 415 V — enough to handle high-fault-current scenarios like large transformer secondaries or busway feeds without cascading upstream. The ETU330 electronic trip unit gives adjustable overload and short-circuit protection curves, plus ground-fault monitoring via summation current formation on L+N conductors.
Ratings and what they mean for fit
The 250 A continuous rating holds flat across the full ambient range from 40 °C to 70 °C — no derating needed in a warm enclosure. That is unusual for an MCCB this size and simplifies panel thermal calculations. The 440 kA at 415 V is the short-circuit breaking capacity; it tells you this breaker can safely interrupt a fault up to that level, which is essential for high-fault installations like main switchboards or feeder breakers close to the transformer. The 187 kA at 690 V covers 600 V class systems common in North American industrial plants. Rated insulation voltage is 800 V, so the breaker is suitable for 690 V systems with margin. The 4-pole design with adjustable N-conductor protection (OFF, 50%, or 100%) makes it flexible for both solidly-grounded and impedance-grounded networks.
Panel integration and physical fit
The 3VA2325-0HM42-0AA0 measures 248 mm high, 184 mm wide, and 110 mm deep. It mounts on a DIN rail or directly to a panel backplate via the standard MCCB footprint. The front face carries IP40 protection — suitable for enclosed switchboards where tools are the only access. Spring-cage or screw terminals accept conductors sized for 250 A; verify lug kit compatibility with your busbar system.