What the ratings mean for fit
The 3VA1140-5EF36-0AD0 is a Siemens SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current at 40 °C, with no derating needed up to 50 °C — at 55 °C it still holds 38.4 A, and at 70 °C it's 36 A. That means for a 40 A feeder in a warm panel, you stay in spec without oversizing. The TM240 thermal-magnetic release is fixed-trip, not adjustable, so what you see on the nameplate is the protection curve you get — no field tweaking. Interrupting capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That 187 kA figure at 240 V means it handles high-fault utility feeds without cascading upstream — common in North American 240/120 V distribution panels. At 415 V, 121 kA still covers most industrial transformer secondaries. The 3-pole construction suits three-phase line protection, and the rated insulation voltage of 800 V gives headroom for 690 V systems.
Panel integration and deployment context
This MCCB measures 70 mm deep, 76.2 mm wide, and 130 mm tall — a compact footprint that fits standard panel-mount cutouts for the 3VA frame size. IP40 on the front means it's protected against tools and wires >1 mm, but not against water ingress; keep it inside an enclosure rated for the environment. It ships with 3 auxiliary switches HQ — these are the form-C type for remote status indication back to a PLC or alarm panel. No undervoltage release, no shunt trip, no communication module on this variant, so if you need remote trip or monitoring beyond the aux contacts, you'll need a different order code or add-on accessories.