Siemens SENTRON 3VA1140-6EF36-0KA0 — 40 A MCCB with Shunt Trip
The Siemens SENTRON 3VA1140-6EF36-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, with a TM240 thermal-magnetic overcurrent release. Its interrupting capacity hits 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — numbers that tell you this breaker is sized for high-fault installations where upstream SCCR demands serious headroom. At 690 V it still clears 17 kA, which covers most industrial motor branch circuits. This is a line-protection variant (no ground-fault monitoring, no communication module, no auxiliary contacts as shipped). It carries a factory-integrated shunt trip release (STL) — order code 3VA9688-0BL33 for the auxiliary trip block if you need remote tripping capability. The front face is IP40 rated, meaning it's protected against tools and small wires but not washdown; mount it inside a panel or enclosure.
Thermal Derating and Ambient Constraints
The breaker carries its full 40 A rating from 40 °C through 50 °C ambient. Above that, it derates linearly: 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 panel ambient runs hot — say, near a drive stack or in a non-ventilated enclosure — factor the 55 °C column into your continuous-load calculation. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Physical Fit and Panel Integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. The 76.2 mm width matches the standard 3-pole MCCB footprint for DIN-rail or screw-mount panel layouts. No auxiliary contact block or communication module is included, so the depth stays at 70 mm — no added protrusion behind the panel door.