What this 3VA2340-7HL32-0AF0 is and what it does
The Siemens SENTRON 3VA2340-7HL32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, designed for line protection in industrial power distribution panels. Its interrupting capacity is 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 7.5 kA at 690 V — meaning it can safely clear faults up to those levels depending on the system voltage, which is the spec that decides whether it holds coordination with upstream gear. The breaker carries a trip indicator and comes fitted with one auxiliary switch plus one trip alarm switch (HQ design), so it reports its status back to a PLC or annunciator without needing a separate contact block.
Thermal derating and real-world current capacity
Rated 400 A continuous up to 50 °C ambient. Above that it derates: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. If your panel ambient runs hot, that 400 A nameplate won't hold — size the load or ventilation accordingly. Maximum power loss is 96 W, which adds to the enclosure heat budget. Factor that into your thermal calculation if the breaker is in a sealed cabinet.
Physical fit and panel integration
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. That depth is the body depth behind the panel face — check your gland plate clearance and door swing before cutting the mounting hole. Operates from -25 °C to 70 °C ambient; stores from -40 °C to 80 °C. The storage range is wider because it's not dissipating heat when shelved.