What this MCCB is and what it protects
The Siemens SENTRON 3VA2325-5MN32-0KB0 is a 3-pole molded case circuit breaker (MCCB) purpose-built for motor protection, with a continuous current rating of 250 A across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up. Its interrupting capacity is what earns it a spot in high-fault installations: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. That 187 kA at 240 V means it safely clears a bolted fault on a large step-down transformer secondary without the arc flashing over or the case rupturing. The breaker includes phase failure detection — if one phase drops out on a motor load, it trips before single-phasing cooks the winding. It ships with a shunt trip (STL) release and two HP auxiliary switches for remote status feedback or safety interlocks.
Sizing and environment
At 248 mm high, 138 mm wide, and 110 mm deep, this MCCB fits standard SENTRON 3VA panel cutouts. The 138 mm width is three pole widths at 46 mm per pole — the same footprint as the 3VA1 frame, so a panel laid out for a 3VA1110 will accept this 3VA2325 without re-drilling the mounting plate. It dissipates 37.5 W maximum at full load, which matters for enclosure thermal rise calculations — particularly in a sealed stainless steel panel on a washdown line. The operating range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C.
Lifecycle and sourcing posture
For a BOM-critical motor protection MCCB, this is a low-risk line item. We source it to order against an RFQ; availability and current pricing are confirmed at quote time. If you are holding a spare for a legacy panel, this is the same part number you need — no substitution guesswork.