What this MCCB carries — and what it protects
The Siemens SENTRON 3VA2225-5KP32-0AJ0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, holding that rating flat through 50 °C before it begins to derate — 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. That thermal curve means you can size it for a 250 A bus in a ventilated enclosure and still have headroom in a warm panel. The interrupting ratings climb to 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V — covering most low-voltage distribution faults without cascading upstream breakers. This is a line-protection design (not motor protection), so it is intended for feeder and main breaker duty in switchboards, panelboards, and downstream distribution. The 3VA2 platform includes communication capability, a trip indicator, and comes fitted with 2 auxiliary switches plus 1 trip alarm switch — enough for remote status indication without adding external relays.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON mounting bases and busbar systems without re-drilling. The 86 mm depth is the body only; allow clearance for the rotary handle throw and cable bending radius at the line and load lugs. Maximum power loss is 48 W at rated current, which matters for thermal coordination inside a sealed enclosure — factor that into your cabinet cooling calculation if grouping multiple breakers.