Siemens 3VA2140-6HM32-0AA0 — 40 A SENTRON MCCB for Line Protection
The Siemens SENTRON 3VA2140-6HM32-0AA0 is a 3-pole molded case circuit breaker rated for 40 A continuous current, built for line protection duty in distribution panels. Its 242 kA interrupting capacity at 240 VAC handles high-fault scenarios typical at the service entrance or main feeder — the kind of fault current that would weld a smaller MCCB's contacts shut. At 415 V and 440 V it still breaks 187 kA, dropping to 121 kA at 500 V and 3.7 kA at 690 V, so the voltage class of your system determines the available fault current it can safely clear. Rated insulation voltage is 800 V, which covers 480 V and 600 V class panels with margin. The 40 A rating holds flat from 40 °C through 70 °C ambient — no derating curve to calculate for warm enclosures, which simplifies panel layout for the OEM wireman. Power loss is 1.6 W maximum — negligible for thermal budgeting inside a crowded enclosure, but worth noting if you're stacking dozens of these on a common bus.
Integration — Panel Fit and Mounting
The 3VA2140-6HM32-0AA0 measures 105 mm wide, 181 mm high, and 86 mm deep — a standard footprint for SENTRON 3VA frame sizes. It mounts on a DIN rail or directly to a backplate via the screw terminals. The 86 mm depth leaves clearance for rear-access wiring in a 200 mm deep enclosure.
Key Ratings at a Glance
Continuous current: 40 A, flat-rated from 40 °C to 70 °C ambient. Poles: 3. Interrupting capacity: 242 kA at 240 VAC, 187 kA at 415/440 VAC, 121 kA at 500 VAC, 3.7 kA at 690 VAC. Insulation voltage: 800 V. Operating temperature: -25 °C to +70 °C. Storage: -40 °C to +80 °C.