SENTRON 3VA1140-3EF32-0JC0 — 40 A MCCB with TM240 Release
The Siemens SENTRON 3VA1140-3EF32-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 40 A and an insulation voltage Ui of 800 V. The TM240 thermal-magnetic release handles overload and short-circuit protection without electronic adjustment — a fixed-trip design suited for distribution panels where coordination studies are already locked. Interrupting capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. At 415 V, that 52.5 kA SCCR covers most industrial service-entrance and sub-feed applications without cascading upstream — the breaker clears a bolted fault before the upstream device sees it, provided the let-through energy is coordinated. Thermal derating is flat to 50 °C (40 A), then drops to 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. In a sealed, non-ventilated enclosure the 55 °C threshold is the one to watch — a 40 A breaker in a 55 °C ambient is effectively a 38 A device.
Integration — Panel Fit and Auxiliaries
Footprint is 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB envelope that fits most DIN-rail or panel-mount backplates without re-drilling. Front IP40 protection handles typical enclosure environments; no washdown rating, so keep it behind a gland plate in wet areas. The breaker ships with two auxiliary switches (HQ type) and a shunt trip (STL) release — the shunt trip is wired separately for remote tripping. The integrated auxiliary trip module is order code 3VA9688-0BL32, which is the factory-matched accessory for this frame. No undervoltage release, no ground-fault module, no communication function — this is a straight thermal-magnetic breaker with remote trip capability only.
Operating Range and Endurance
Rated for -25 °C to 70 °C operating ambient, with storage from -40 °C to 80 °C. Mechanical endurance is 15,000 latching operations — adequate for a distribution breaker that sees infrequent switching; not rated for daily motor-start duty. The TM240 release is a fixed thermal-magnetic design, so no field-adjustable trip curve — coordination is set at the factory.