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. At 415 V, 121 kA still covers most industrial transformer secondaries.
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. It ships with 3 auxiliary switches HQ — these are the form-C type for remote status indication back to a PLC or alarm panel.