The Siemens 3VA1140-5EF36-0AG0 is a SENTRON molded case circuit breaker (MCCB) for line protection, rated 40 A continuous at 40 °C and carrying a TM240 thermal-magnetic release. Three-pole design with a 1 auxiliary switch plus 1 trip alarm switch HP. The interrupting capacity hits 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V — numbers that cover high-fault commercial and industrial service entrances. IP40 on the front; the rest of the enclosure is panel-side.
Thermal derating and continuous current
The 40 A rating holds flat from 40 °C up to 50 °C. Above that the curve drops: 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 the panel ambient runs hot — say next to a drive cabinet or a transformer — the 36 A floor at 70 °C is the number to size against, not the 40 A nameplate.
DIN-rail footprint and panel fit
Width 76.2 mm (three-pole), depth 70 mm, height 130 mm. That is a standard MCCB footprint for a 3-pole 40 A frame. The IP40 front rating means the operator face is protected against tools and fingers; the rest relies on the enclosure seal. No undervoltage release, no communication module, no phase-failure detection — this is a straight thermal-magnetic breaker with a trip indicator and the auxiliary contact block built in.