The Siemens SENTRON 3VA1140-3EF32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated 40 A at 40 °C, designed for line protection in distribution panels. Its 75.6 kA interrupting capacity at 240 V gives headroom for high-fault service entrances or sub-distribution boards where the available fault current is substantial. The 800 V rated insulation voltage means it can be applied in 480Y/277 V or 600 V industrial systems without derating the insulation path. Rated current holds at 40 A from 40 °C through 50 °C, then steps down to 39 A at 55–60 °C and 38 A at 65 °C, 37 A at 70 °C (–). For a panel that runs warm — say a packed enclosure near a motor drive — the 38 A at 65 °C figure is the one to size against, not the 40 A nameplate. Maximum power loss is 10.8 W, which adds to the enclosure thermal budget.
Breaking Capacity by Voltage — Selectivity Planning
The interrupting ratings step down with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V (–). In a 480 V panel, the 32 kA figure governs; if the available fault current at the board is 35 kA, this breaker is not the right choice upstream — you would need a higher-rated frame or a current-limiting fuse ahead of it. At 240 V, the 75.6 kA rating covers essentially any service entrance in North America.
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep (–). The 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for this frame size — it fits the same DIN-rail or panel-mount cutout as other SENTRON 3VA1 breakers. Depth of 70 mm (2.76 in) leaves room for rear-connection busbars or a backplate in a 200 mm deep enclosure.
Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. The storage minimum of -40 °C matters for unheated warehouses or site containers in cold climates — the breaker can sit through a winter without damage. The product is designed to IEC/EN 60947-2 and carries CE marking for European installations; UL/CSA listing is standard for the SENTRON family, though the specific file number is not in this record.