What this MCCB delivers in the panel
The Siemens SENTRON 3VA2325-6HM42-0AA0 is a 4-pole molded case circuit breaker rated for 250 A continuous current, sized for line protection duty in distribution panels. Its 242 kA interrupting capacity at 240 V gives serious fault-current headroom for high-capacity transformer secondaries or busway feeds — the kind of install where a standard 65 kA breaker would need upstream fusing to coordinate. At 415 V and 440 V it still holds 187 kA, dropping to 121 kA at 500 V and 7.5 kA at 690 V; the steep roll-off above 500 V means you verify the available fault current at the actual service voltage, not the nameplate maximum. The ground-fault monitoring uses summation current formation on L+N, so it detects leakage without a separate GFCI module — one less device to wire into the enclosure.
Dimensions and panel fit
The 3VA2325-6HM42-0AA0 measures 248 mm high, 184 mm wide, and 110 mm deep — a 4-pole frame that occupies roughly 7.24 inches of DIN-rail width. The 110 mm depth (4.33 in) is shallow enough for most 300 mm deep enclosures without crowding the gland plate; it leaves room for outgoing cable bends behind the breaker. Mounting is standard SENTRON 3VA screw-clamp to the backplane or DIN rail adapter; verify the existing panel's busbar drilling pattern if replacing a different brand's 4-pole MCCB, since the terminal centers may differ.
Thermal performance and derating
The breaker holds its 250 A rating flat from 40 °C through 70 °C ambient — no derating curve to calculate for warm enclosures. That is unusual for a molded case breaker; most competitors start tapering above 50 °C. The maximum operating temperature is 70 °C, storage range -40 °C to 80 °C. Power loss at full load is 37.5 W, which matters for enclosure thermal rise calculations in sealed cabinets.
Protection and release features
This is a line-protection design — no undervoltage release, no voltage trip, no communication module onboard. The trip unit is set with an initial value of 50 A and a full-scale value of 250 A, so it is field-adjustable within that range. No trip indicator is fitted; fault events are signaled only by the handle position and downstream monitoring. The insulation voltage rating is 800 V, giving margin above the 690 V interrupting rating.