Rated 40 A continuous at 40 °C, this 3-pole unit carries a 121 kA interrupting capacity at 240 VAC, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V — numbers that matter when coordinating with upstream gear for selective coordination.
This MCCB's short-circuit rating is voltage-dependent, as you'd expect from a current-limiting design. At 240 VAC it clears 121 kA symmetrical; at 415 VAC that drops to 75.6 kA; at 440 VAC it's 52.5 kA; and at 500 V or 690 VAC it's 11.9 kA.
At 55 °C it derates to 39 A; at 65 °C to 38 A; at 70 °C to 37 A. That's a shallow derating curve — only 3 A lost across a 30 °C rise — so in a warm enclosure you're not giving up much headroom. Maximum power loss at rated load is 13.3 W.
The 70 mm depth means it clears most shallow enclosures without a gland-plate conflict.