The Siemens SENTRON 3VA2040-6HN32-0BD0 is a 3-pole molded case circuit breaker rated for 40 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. That makes it a straight drop-in for a 40 A feeder or branch circuit in a panel that sees elevated internal temperatures. Interrupting capacity is the headline here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. That 242 kA figure at 240 V means it can be placed on a transformer secondary or a high-fault bus without needing a current-limiting fuse upstream — saves a fuse holder and a line-up coordination study. The breaker includes an undervoltage release (UVR) as part of the auxiliary release design, and it ships with three auxiliary switches HQ. No trip indicator, no voltage-trigger function, no communication module — this is a straightforward line-protection MCCB for a fixed-load feeder, not a metering or remote-trip device.
Panel Fit & Integration
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard SENTRON 3VA2 footprint that fits existing DIN-rail or panel-mount cutouts for the series. The 86 mm depth is shallow enough for a 200 mm deep enclosure; no need to step up to a 300 mm can. Power loss is 4.7 W maximum — negligible for thermal budgeting inside a sealed panel, but worth noting if you're stacking multiple breakers in a row without forced ventilation.