What this MCCB carries and where it fits
The Siemens SENTRON 3VA1140-5EF32-0HH0 is a 3-pole molded case circuit breaker rated for 40 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. It's the line protection version — meaning it's built for feeder and main breaker duty in distribution panels, not motor protection with integrated overloads. The interrupting ratings climb to 187 kA at 240 V, drop to 121 kA at 415 V, and settle at 17 kA at 690 V, so it handles high-fault-capacity service entrances and sub-distribution boards where the available fault current is substantial. The thermal derating curve matters if the panel runs hot: it holds 40 A all the way to 50 °C ambient, then steps down 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. If your enclosure sits near a drive cabinet or a sunny roof, size the continuous load against the 55 °C column, not the 40 °C sticker. The auxiliary contact configuration ships with 2 auxiliary switches plus 1 trip alarm switch (HQ version), and a shunt trip (STL) auxiliary release is included — the integrated auxiliary trip order code is 3VA9688-0BL30. No undervoltage release, no ground-fault monitoring, no communication function on this variant. It's a straight thermal-magnetic breaker with a shunt trip for remote opening; if you need UVR or GF protection, that's a different order code in the 3VA family.
Panel fit and mounting
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep. That 76.2 mm width is a standard 3-pole MCCB footprint — it occupies three 25.4 mm (1-inch) module positions on a DIN rail or a mounting plate. The IP40 front protection means it's sealed against tools and small debris from the front, but the back and sides are open to the enclosure; keep the panel door closed and the gland plate sealed if the environment is dusty or wet. Rated insulation voltage is 800 V, and the latching endurance is rated at 15 000 cycles — that's the mechanical life for the switching mechanism. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. If the breaker sits in an unheated warehouse over a winter weekend, it'll be fine; just don't switch it under load below -25 °C without warming the mechanism first.
Lifecycle and sourcing posture
Pricing and availability are confirmed at quote time against an RFQ. The 3VA family is broadly stocked, but the specific variant with the shunt trip and HQ auxiliary contacts (2 aux + 1 alarm) is a configured order code — not every distributor carries it on the shelf. Submit an RFQ for current lead time and per-unit pricing; we source through the independent channel and can quote against your required quantity and delivery window.