The Siemens SENTRON 3VA2140-8HL36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current with no derating across the full operating temperature range from -25 °C to 70 °C — that means you don't lose capacity in a warm panel, unlike many breakers that start derating above 40 °C. Interrupting capacity is substantial: 440 kA at 240 V AC, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. That high fault-clearing ability means it can be installed close to large transformers or high-capacity busways without worrying about the breaker failing to clear a bolted fault — the arc extinguishes inside the molded case, not upstream. The IP40 front protection keeps dust and accidental contact out of the trip mechanism, but it's not rated for washdown — keep it in a dry enclosure.
The 105 mm width (4.13 in) means it occupies three pole spaces in a typical MCCB lineup — verify your busbar spacing before committing the drill pattern.