Rated for a 250 A feeder at 40 °C — what the ratings mean for fit
The 3VA2225-6KP32-0DC0 is a Siemens SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with no derating needed up to 50 °C — the same 250 A holds across that range. At 55 °C it still carries 238 A, and at 70 °C it holds 200 A, so it fits a warm enclosure without oversizing the frame. The interrupting ratings climb with voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V — the 690 V figure is typical for a 250 A frame and confirms it handles low-level faults at that voltage but is not intended for high-fault 690 V mains. The 3-pole design is configured for line protection, with an undervoltage release fitted and a communication function for remote status. Maximum power loss is 50.5 W — factor that into panel thermal calculations.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard 3-pole MCCB footprint for 250 A frames. The 105 mm width means it occupies roughly four 27 mm module spaces on a DIN rail, though the mounting method (screw-clamp or rail) should be confirmed from the installation instructions. The 86 mm depth leaves room for rear busbar connections in a typical 200 mm deep enclosure. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C, so it handles cold warehouses and hot panels.