What this MCCB is and what it carries
The Siemens SENTRON 3VA2340-5JP32-0HA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, designed for line protection in distribution panels. It carries a 187 kA interrupting capacity 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 SCCR headroom means it handles high-fault utility feeds without cascading upstream. The breaker includes a shunt trip release (STL) for remote emergency-off or undervoltage control, and it supports communication functions for integration into a monitored power system.
Thermal derating and panel fit
The 400 A rating holds flat from 40 °C through 50 °C, then derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If the panel ambient runs above 50 °C, size the feeder and downstream gear for the derated value. The case measures 248 mm high by 138 mm wide by 110 mm deep — that 138 mm width is a standard 3-pole MCCB footprint for a 400 A frame, so it drops into existing SENTRON mounting bases without re-drilling the backplate.