The Siemens SENTRON 3VA2225-6KP32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current of 250 A, designed for line protection in distribution panels. Its breaking capacity reaches 242 kA at 240 V and 187 kA at 415 V, per the specification, which means it can safely interrupt high fault currents without cascading upstream — a key parameter for selectivity studies in industrial switchgear. The unit includes a communication function, enabling integration with monitoring systems for remote status and power measurement.
Thermal derating and ambient conditions
The breaker holds its full 250 A rating up to 50 °C ambient. Above that, current must be derated per the datasheet curve: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. For a panel builder or site electrical engineer, this means the 250 A frame can serve a 250 A load only if the enclosure ambient stays under 50 °C; in a hot MCC room or outdoor cabinet, the actual ampacity drops. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Breaking capacity across voltage levels
The interrupting rating varies with system voltage, as evidenced by the specification: 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. For a commissioning engineer verifying SCCR compliance, the 690 V figure is the limiting case — ensure the available fault current at that voltage does not exceed 4.5 kA. The minimum breaking capacity is listed as 375 A, and the maximum as 2 500 A.
Physical dimensions and panel fit
Dimensions: 86 mm depth, 105 mm width, 181 mm height. These are the envelope for DIN-rail or direct-panel mounting. An MRO planner or panel builder should verify the 105 mm width clears adjacent devices in a multi-breaker lineup. The unit ships with 3 auxiliary switches (HQ type) as standard; no undervoltage release or ground-fault monitoring is included, per the design specification.