The 3VA1140-6EF36-0JH0 is a Siemens SENTRON 3-pole molded case circuit breaker rated 40 A at 40 °C, with a maximum interrupting capacity of 220 kA at 240 V. The 40 A continuous rating holds steady through 50 °C; above that it derates to 39 A at 55 °C, 38 A at 65 °C, and 37 A at 70 °C, so a panel running warm needs a headroom check.
Dimensions are 76.2 mm wide, 130 mm high, 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or screw-mount panel layouts. The 70 mm depth means it clears shallow enclosures where a deeper breaker would interfere with the gland plate or door clearance. Power loss is 10.8 W maximum; factor that into the enclosure thermal budget, especially in a sealed cabinet.