The Siemens SENTRON 3VA1040-3ED36-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated at 40 A continuous at 40 °C ambient, with a breaking capacity of 75.6 kA at 240 V AC and 52.5 kA at 415 V AC. It's a line-protection device — the standard job is protecting cables and busbars from short-circuit and overload in a distribution panel. The 40 A rating holds steady from 40 °C up to 50 °C, then derates to 38.4 A at 55 °C and 36 A at 70 °C — so if the panel runs hot, the breaker still carries the load without nuisance tripping.
Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB form factor that drops into most SENTRON panelboards and DIN-rail adapters without re-drilling.
The 75.6 kA at 240 V and 52.5 kA at 415 V are the interrupting ratings — the maximum fault current this breaker can safely clear at those voltages. At 440 V it's 32 kA, and at 500 V and 690 V it drops to 7.5 kA.