Siemens SENTRON 3VA2340-6KP32-0DC0 — 400 A Molded Case Circuit Breaker
The Siemens SENTRON 3VA2340-6KP32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with a maximum interrupting capacity of 242 kA at 240 V. It is designed for line protection and includes an undervoltage release and communication function, making it suitable for integration into industrial power distribution panels where high fault current capability and remote monitoring are required.
Key Ratings and What They Mean for Panel Fit
The 400 A continuous rating at 40 °C holds flat 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 (–). That means in a warm enclosure — say, a panel running 55 °C ambient — the breaker is still good for 375 A, so you don't need to oversize for a typical industrial cabinet. The interrupting ratings span 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V (–). The 187 kA at 415 V covers most European industrial service entrance requirements; the drop to 7.5 kA at 690 V means this is not the breaker for a 690 V main — that's a coordination call.
Integration and Mounting
The breaker measures 110 mm deep, 138 mm wide, and 248 mm high (–). It mounts on a DIN rail or directly to a panel backplate; the 138 mm width fits standard 3-pole MCCB cutouts. Maximum power loss is 98.5 W, which should be factored into enclosure thermal calculations — especially if the breaker is grouped with other high-current devices. The auxiliary switch configuration includes two HQ auxiliary switches and an undervoltage release, all factory-installed.