The Siemens SENTRON 3VA2340-6JP32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, designed for line protection in low-voltage distribution. It carries an interrupting capacity of 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 — covering high-fault industrial feeds and transformer secondaries. The breaker includes an undervoltage release (UVR) and supports communication functions, making it suitable for remote monitoring or automated load shedding in a panel.
Temperature derating and real-world current
The 400 A rating holds up to 50 °C ambient. Above that, it derates: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If the panel runs hot — near a drive cabinet or in a sealed enclosure — the actual continuous current the breaker can carry drops. Size the load accordingly; a 400 A feeder in a 60 °C panel is effectively a 350 A breaker.