Siemens 3VA1040-2ED32-0DH0 — SENTRON 3-pole MCCB, 40 A, line protection
It carries a continuous rating of 40 A at ambient temperatures up to 50 °C, with derating above that: 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C — so in a warm panel you lose about 10% headroom by 55 °C. Interrupting capacity varies by system voltage: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That 52.5 kA figure at 240 V covers most North American low-voltage distribution faults; the 32 kA at 415 V handles European 400 V-class networks with typical available fault currents.
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that drops onto a DIN rail or mounts directly in a distribution panel. The 70 mm depth keeps the breaker within typical enclosure clearances for gland-plate clearance and busbar routing. Rated insulation voltage is 800 V, and the operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C. Maximum power loss is 13.3 W — manageable for thermal coordination inside a sealed panel but worth factoring into the enclosure's dissipation budget if multiple breakers are ganged.