What this MCCB delivers
The Siemens SENTRON 3VA1140-3EF36-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries a continuous current of 40 A at 40 °C, derating to 37 A at 70 °C — the thermal curve is linear across that band, so no surprise drop at the top end. Breaking capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, and 11.9 kA at 690 V. That 75.6 kA figure at 240 V means it can interrupt a fault of that magnitude without upstream fuses needing to clear — useful for high-fault panels fed close to a transformer. Rated insulation voltage is 800 V, so the breaker is electrically rated for 690 V systems with margin. The unit includes a shunt trip (STL) for remote opening and two auxiliary switches plus one trip alarm switch (HQ) for status feedback to a PLC or annunciator. Maximum power loss is 10.8 W — negligible for panel thermal budgeting, but worth noting if you're packing breakers into a sealed enclosure with other heat sources.
Lifecycle and sourcing posture
For a BOM freeze or a panel that needs a documented second-source, note that the 3VA1110-5ED36-0AC0 is a lower-rated sibling in the same SENTRON 3VA family. The 3VA1140-3EF36-0JH0 carries a higher continuous current (40 A vs the 3VA1110's rating) and different breaking capacities — verify the specific interrupting rating your coordination study requires before swapping.
Mounting and integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard MCCB footprint that fits most DIN-rail or panel-mount enclosures without adapter plates. The 3-pole form factor matches typical 3-phase feeder or branch circuits. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. That covers unheated warehouses and outdoor cabinets in most climates, but the 70 °C operating limit means you need to account for internal enclosure temperature rise if the panel is in direct sun or near a furnace.