What it is and what it does
The Siemens SENTRON 3VA2340-5JP32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, designed for line protection in distribution panels and switchboards. Its 187 kA interrupting capacity at 240 V gives you headroom for high-fault installations — that's the kind of SCCR that keeps selectivity intact downstream without cascading failures. The 138 mm width and 248 mm height fit the standard SENTRON 3VA mounting footprint, so it swaps into existing panel layouts without re-drilling gland plates. Depth is 110 mm — that's the dimension that matters when you're up against a shallow enclosure back wall.
Ratings that decide the fit
Continuous current holds at 400 A from 40 °C through 50 °C ambient. Above that, derate in 25 A steps: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, 300 A at 70 °C. If your panel runs hot near the top of the enclosure, that 70 °C floor of 300 A still covers a 300 A feeder — but you lose 100 A of headroom. Interrupting ratings climb with voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. That 7.5 kA at 690 V is the weak link if you're on a 690 V system — verify your available fault current doesn't exceed that. Maximum power loss is 96 W. That's the heat you need to vent through the enclosure — factor it into your thermal budget, especially if the breaker sits in a multi-unit lineup.
Communication and auxiliaries
This variant includes a communication function — that means it can talk to a higher-level control system for remote monitoring and trip data, not just local indication. The auxiliary switch configuration is 2 auxiliary switches plus 1 trip alarm switch HQ, giving you status feedback for both normal and fault states. The supplied basic switch order code is 3VA2340-5JP32-0AA0 — that's the core breaker without the communication module. If you're ordering spares or need to match an existing panel, that's the base unit this one builds on.
Environmental range
Operating temperature spans -25 °C to 70 °C; storage range is -40 °C to 80 °C. That storage floor matters if the breaker sits in an unheated warehouse before installation — it can take the cold without damage.