What this 3VA2340-5HN32-0HL0 is and what it does
The Siemens SENTRON 3VA2340-5HN32-0HL0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, designed for line protection in distribution panels. It carries interrupting ratings of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — so it handles high-fault utility feeds and large motor branch circuits without cascading upstream. The 400 A frame means it's sized for main or heavy feeder duty, not sub-feed or lighting panels.
Ratings that matter for fit
Continuous current holds 400 A from 40 °C through 50 °C, then derates linearly to 340 A at 70 °C — so in a warm enclosure you still have margin, but above 50 °C you lose 15 A per 5 °C step. The operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss is 96 W, which matters for thermal coordination inside a sealed cabinet. Dimensions are 110 mm deep, 138 mm wide, 248 mm tall — a standard 3-pole MCCB footprint for this class, so it drops into existing SENTRON mounting bases and busbar systems without panel rework. The auxiliary switch configuration is 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ, plus a shunt trip (STL) release built in. That means it reports status and can be remotely tripped without adding external relays.