What this MCCB carries and where it fits
The Siemens SENTRON 3VA2325-5MN32-0JC0 is a 3-pole molded case circuit breaker rated for 250 A continuous at 40 °C, with the same rating holding flat through 70 °C — no derating needed across the normal panel ambient range. The interrupting capacity reaches 187 kA at 240 V, stepping down to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. That 187 kA figure at 240 V puts this breaker into high-fault applications where the available short-circuit current exceeds what a standard 100 kA MCCB can handle — think large transformer secondaries or utility-service entrances where the fault current is stiff. The 7.5 kA at 690 V still clears a 690 V motor circuit, but the real headroom is at the lower voltages where most industrial distribution runs. Designed specifically for motor protection, this MCCB includes phase failure detection — it trips on loss of one phase, preventing single-phasing damage to a motor load. The breaker ships with a shunt trip release (STL) for remote emergency-off or supervisory tripping, plus two HQ auxiliary switches for status feedback to a PLC or panel指示灯. No undervoltage release is fitted; if undervoltage protection is needed, that release must be added separately.
Dimensions and panel fit
The 3VA2325-5MN32-0JC0 measures 248 mm high by 138 mm wide by 110 mm deep — a standard SENTRON 3VA frame size that drops into the same DIN-rail or mounting-plate footprint as other 250 A MCCBs in the series. The 110 mm depth leaves clearance behind a 200 mm deep enclosure back panel for wiring and lug access. Width of 138 mm means it occupies three 45 mm pole spaces on a DIN rail, typical for a 3-pole MCCB at this current level.
Operating conditions and power loss
The breaker operates from -25 °C to 70 °C ambient, with storage from -40 °C to 80 °C. Maximum power loss at rated current is 37.5 W — a figure to include in enclosure thermal calculations if the panel is densely packed. The trip indicator is not fitted on this variant; trip status is read via the auxiliary switches or the shunt trip activation.