What the ratings mean for fit
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. That interrupting rating means it can safely clear a bolted fault up to 220 kA at 240 V without rupturing — critical for high-fault-capacity panels near large transformers or utility feeds. 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. Rated insulation voltage is 800 V, and the breaker is designed for line protection — meaning it protects cables and busbars from overloads and short circuits, not motor or generator circuits. It carries a shunt trip (STL) for remote tripping and two auxiliary switches plus one trip alarm switch, so you can signal breaker status back to a PLC or annunciator panel.
Panel integration and mounting
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.