400 A MCCB with high interrupting capacity
The Siemens SENTRON 3VA2340-7HL32-0HA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C ambient, with a maximum interrupting capacity of 330 kA at 240 V AC — that is the peak fault current it can safely clear without welding contacts or rupturing the case, sized for high-fault utility feeds or transformer secondaries where standard MCCBs would cascade-fail upstream. Rated current holds flat at 400 A up to 50 °C, then derates linearly to 340 A at 70 °C — the thermal-magnetic or electronic trip unit inside tracks the actual conductor temperature, so a panel builder can size the breaker for a 400 A bus at 40 °C and still have headroom in a warm enclosure without nuisance tripping. Interrupting capacity drops with system voltage: 242 kA at 415/440 V, 187 kA at 500 V, and 7.5 kA at 690 V — the 690 V figure is the one to check if this breaker lands on a 690 V mining or marine distribution board, because 7.5 kA is modest and may not coordinate with downstream devices.
Line protection with shunt trip
Current lifecycle — active production
Maximum power loss is 96 W at rated current — a panel thermal designer should account for that heat dissipation inside the enclosure, especially if multiple breakers are ganged in a sealed cabinet without forced ventilation.
Sourcing and compliance
The basic switch variant is 3VA2340-7HL32-0AA0 — the -0HA0 suffix adds the shunt trip release.