What this MCCB delivers in the panel
The Siemens SENTRON 3VA2340-6JP32-0CH0 is a 3-pole molded case circuit breaker rated 400 A continuous at 40 °C, designed for line protection in distribution panels. Its breaking capacity reaches 242 kA at 240 V and 187 kA at 415 V, which means it can safely interrupt high fault currents without upstream damage — critical for main or feeder breakers in industrial switchgear. The unit includes an undervoltage release (UVR) and comes pre-configured with 2 auxiliary switches plus a trip alarm switch, so you get status feedback without adding external relays.
Derating and thermal performance
The breaker holds its full 400 A rating up to 50 °C. Above that, it derates linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your panel runs hot — say near a transformer or in a non-ventilated enclosure — size the load to the derated value, not the nameplate. The maximum power loss is 98.5 W, which factors into enclosure heat calculations.
Breaking capacity by voltage level
This MCCB's interrupting rating varies with system voltage: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. The 690 V figure looks low, but that's typical for a 400 A frame at that voltage — verify your fault current at the point of installation doesn't exceed 7.5 kA if you're running a 690 V system. For standard 400 V class distribution, 187 kA gives generous headroom.
Auxiliaries and communication
The 3VA2340-6JP32-0CH0 ships with an undervoltage release (UVR) factory-fitted, plus 2 auxiliary switches and 1 trip alarm switch (HQ design). It also supports communication functions — meaning it can integrate with a BMS or SCADA system for remote monitoring and tripping. The base switch variant is 3VA2340-6JP32-0AA0 if you need a reference for spare aux kits.