Interrupting capacity is the headline here: 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V. The 4-pole design with 100% N-conductor protection means the neutral pole is fully rated, not just a switched neutral — important for 3-phase + N panels where you need the neutral protected against overload.
The 25 A rating holds flat from 40 °C through 50 °C, then drops to 24 A at 55–60 °C, and 23 A at 65–70 °C. That 101.6 mm is a standard 4-inch width, so it occupies four 25 mm DIN-module spaces on the rail. The 70 mm depth means it clears a 100 mm deep enclosure backplate without the line-side lugs hitting the cover — I have seen 80 mm deep breakers that force a deeper can. It is a straight thermal-magnetic breaker: wire it in, it trips, you reset it manually.