Siemens SENTRON 3VA2225-5KP32-0CA0 — 250 A MCCB with UVR and Communication
The Siemens SENTRON 3VA2225-5KP32-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, designed for line protection in industrial distribution panels. Its interrupting capacity reaches 187 kA at 240 V and 121 kA at 415 V, which means it can safely clear high-fault currents on the secondary side of a typical 400 V transformer without cascading upstream. The breaker includes an undervoltage release (UVR) and a communication function, so it can be integrated into a monitored power distribution scheme.
Breaking Capacity and Thermal Derating
The 3VA2225-5KP32-0CA0 holds its full 250 A rating from 40 °C through 50 °C, then derates to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. In a panel with ambient above 50 °C, the continuous load must be reduced per this curve. Breaking capacity drops with system voltage: 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. At 690 V the breaker is still rated for line protection but the fault-clearing margin narrows — selectivity coordination studies should confirm the downstream devices stay within the 4.5 kA limit.
Physical Fit and Panel Integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation in a SENTRON distribution board. The 86 mm depth means it clears a typical 200 mm deep enclosure without forcing a deeper gland plate. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 50.5 W, which should be factored into the enclosure thermal budget.