The Siemens SENTRON 3VA2140-5MN32-0JA0 is a 3-pole molded case circuit breaker (MCCB) built for motor protection, rated 40 A continuous current (Iu) at up to 50 °C ambient — above that it derates to 38.4 A at 55 °C and 36 A at 70 °C, so if your panel runs hot, that 40 A nameplate shrinks. Interrupting capacity is the headline here: 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 17 kA at 690 V. At 690 V the 17 kA still covers most motor branch circuits. The base switch is 3VA2140-5MN32-0AA0. No auxiliary contacts, no undervoltage release, no ground-fault module on this variant. If you need those, this isn't the order code.
Maximum power loss is 75 W — that's the heat it dumps into the enclosure at full rated current. If you're packing several of these in a sealed cabinet, factor that into your thermal calculation.
Operating range and storage
Mechanical endurance is 20,000 cycles (latching).