400 A MCCB for high-fault line protection
The Siemens 3VA2340-6HN32-0AG0 is a SENTRON molded case circuit breaker rated for 400 A continuous at 40 °C, with a maximum interrupting capacity of 242 kA at 240 V AC. That 242 kA figure at 240 V means it can safely clear a fault up to that level without upstream devices needing to trip — critical for high-fault panels where selectivity matters. At 415 V it still holds 187 kA, and at 690 V it derates to 7.5 kA, so the voltage-dependent curve is what you coordinate against, not the headline number. Three-pole design, line protection application — this is the main breaker for a feeder or large motor branch, not a downstream distribution breaker. The 400 A frame carries full current from 40 °C up to 50 °C without derating; above that, the thermal curve drops to 385 A at 55 °C and 340 A at 70 °C. If your panel ambient runs hot, size the load below the derated figure.
Auxiliary switching and trip indication
Comes with one auxiliary switch and one trip alarm switch HP (high-performance) factory-installed. The trip alarm signals a fault trip separately from the aux contact that tracks the breaker's on/off position — useful for remote SCADA or DCS alarming on a paper machine line where an unplanned trip kills tonnes on the reel. No undervoltage release, no ground-fault monitoring, no communication function on this variant; it's a straight line-protection breaker with basic status feedback. Dimensions: 248 mm high, 138 mm wide, 110 mm deep. The 110 mm depth is the mounting depth behind the panel door — factor that into enclosure sizing if retrofitting into an existing MCC bucket. Power loss at rated load is 96 W maximum, so ventilation in a sealed enclosure needs to handle that heat.