The Siemens SENTRON 3VA2340-5JP32-0KA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current, designed for line protection in distribution panels. It carries a shunt trip release (STL) for remote tripping and includes a communication function for integration into monitored systems.
Breaking capacity and SCCR
The interrupting ratings span the voltage range: 187 kA at 240 V, 121 kA at both 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 this breaker handles high-fault scenarios on the low-voltage side without cascading upstream — useful for transformer secondaries or large busway feeds.
Thermal derating
The breaker holds its full 400 A rating from 40 °C up to 50 °C. Above that, it derates linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your panel ambient runs hot — say, a packed enclosure with drives — plan for that 300 A floor at 70 °C rather than the nameplate 400 A.
Physical fit and mounting
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep. That 110 mm depth is the critical dimension for shallow enclosures or gland-plate clearance — measure your backpan depth before committing the BOM line. The 138 mm width is standard for a 3-pole MCCB in this class; it occupies one full module on the DIN rail.