What it is — and what the ratings mean
The Siemens SENTRON 3VA2225-6JP32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 250 A continuous at 40 °C through 50 °C without derating. At 240 V it interrupts 242 kA — that's the short-circuit rating that governs fault clearance upstream of a transformer or a high-fault panel. At 415 V and 440 V it holds 187 kA, dropping to 121 kA at 500 V and 4.5 kA at 690 V. The 250 A frame is sized for a feeder or a large motor branch; the 242 kA SCCR at 240 V means it can sit on a utility-grade fault source without needing a current-limiting fuse ahead of it. Thermal derating starts at 55 °C — 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, 200 A at 70 °C. If the panel ambient runs above 50 °C, the continuous current must be backed off by the published curve. The operating temperature range is -25 °C to 70 °C; storage tolerance is -40 °C to 80 °C, which covers a nacelle's winter idle or a desert warehouse. Power loss at full load is 48 W maximum — relevant for enclosure heat rise calculations when multiple breakers are ganged in a panel. The breaker includes a shunt trip (STL) release and two auxiliary switches plus one trip alarm switch (HQ), which gives remote status and trip indication without an add-on module.
Mounting and panel fit
The 3VA2225-6JP32-0JH0 measures 105 mm wide, 181 mm high, and 86 mm deep. That 86 mm depth is the dimension that matters when the gland plate or enclosure door is tight — it's shallower than many MCCBs in the 250 A frame class, so it fits retrofit panels where the backpan depth is limited. The 105 mm width per pole (35 mm per pole) is standard for SENTRON 3VA breakers; a 3-pole unit occupies three 35 mm DIN slots if base-mounted, or bolts directly to a mounting plate.