What the ratings mean for your panel
The Siemens SENTRON 3VA2325-6HN32-0JC0 is a 3-pole molded case circuit breaker rated for 250 A continuous current across the full 40–70 °C ambient range — no derating needed as the panel warms up. Its interrupting capacity is voltage-dependent: 242 kA at 240 V, 187 kA at 415/440 V, 121 kA at 500 V, and 7.5 kA at 690 V. That 242 kA figure at 240 V means it handles the full fault current available at a large service entrance without cascading upstream — critical for selectivity in a main or feeder breaker position. The 7.5 kA at 690 V still covers most industrial motor branch circuits.
Line protection with integrated shunt trip
This MCCB is designed for line protection (cable/feeder) rather than motor or generator protection — the trip curve and accessories are tuned for overcurrent on distribution circuits. It ships with a shunt trip (STL) auxiliary release and two HQ auxiliary switches, so you can remotely trip the breaker or signal its status back to a PLC without adding an external undervoltage release module. The basic switch core is order code 3VA2325-6HN32-0AA0.
Physical fit and panel integration
Dimensions are 110 mm deep × 138 mm wide × 248 mm high. The 138 mm width is standard for a 3-pole MCCB in this frame size — it fits the usual DIN-rail or panel-mount footprint without surprises. Maximum power loss is 37.5 W, so account for that heat in a sealed enclosure. Operating temperature range is -25 to 70 °C; storage range is -40 to 80 °C.