The Siemens SENTRON 3VA1225-6EF42-0KC0 is a 4-pole molded case circuit breaker (MCCB) rated at 250 A continuous current, designed for line protection in industrial power distribution panels. Its 220 kA breaking capacity at 240 V handles high-fault scenarios typical of large transformer secondaries or bus-tie applications — the interrupting rating drops to 154 kA at 415 V and 36 kA at 440 V, so selectivity studies need to account for the actual system voltage.
Mounts on a standard DIN rail or direct panel-mount via the 4-pole footprint — 140 mm wide, 158 mm tall, 70 mm deep. The front face carries IP40 protection, meaning it resists tools and wires above 1 mm but is not sealed against dust ingress; install in a clean enclosure. The TM240 thermal-magnetic release provides fixed overload and short-circuit protection with no field-adjustable trip curve, so coordination with downstream breakers must be verified at the design stage.