What this 40 A MCCB brings to the panel
The interrupting rating at 240 V is 187 kA, which drops to 121 kA at 415 V and 440 V, then 76 kA at 500 V, and 3.8 kA at 690 V. It carries the ETU850 electronic trip unit — that's the adjustable-release version, not a fixed thermal-magnetic. The N-conductor protection is adjustable from OFF through 40 % to 160 %, and the response time tr is settable from 0.5 s up to 25 s. That kind of adjustability matters when you're coordinating selectivity downstream or protecting a feeder that feeds mixed loads.
Fit and footprint
That depth is the critical dimension for enclosure clearance — 86 mm (3.4 in) means it fits standard 200 mm deep enclosures without the cover bumping the door.