The 70 mm installation depth matches standard DIN-rail enclosures; the 1-module-width (18 mm) footprint saves rail space in sub-distribution boards.
The 25 A rating at 30 °C ambient is the headline figure; at 40 °C it derates to 24 A, and at 45 °C to 23.5 A, so if the breaker lives in a warm enclosure or near other heat sources, factor the thermal derating into the load calculation. For installations where the available fault current exceeds that — say, close to a transformer — you need a higher-rated device or upstream current-limiting protection. The 1+N design switches the neutral, which is required in some regional wiring codes for single-phase final circuits.
The 1+N pole occupies a single modular width (18 mm), so it fits tight sub-distribution boards. Touch protection is built into the terminal design — no additional finger-safe covers needed for the line-side connections. The neutral conductor is switched internally, so verify the wiring scheme matches your distribution board's neutral bar arrangement.