What the ratings mean for fit
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. The ETU320 electronic trip unit gives you adjustable overload and short-circuit protection curves, so it's suited for feeder or branch circuit protection where you need coordination selectivity downstream. 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. At 86 mm deep, 105 mm wide, and 181 mm tall, it fits standard MCCB panel footprints. 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.
Panel integration notes
Mounts on a standard DIN rail or direct panel-mount via the molded case lugs. 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. No undervoltage release or shunt trip fitted on this variant, so if you need remote tripping, you'll want the -8JQ32 sibling or add an external trip module.