The interrupting ratings tell the real story for panel coordination: 100 kA at 400 V and 500 V, and 100 kA at 240 V — that is a high-fault-current rating that lets this breaker sit close to a large transformer or a high-capacity bus without needing a current-limiting fuse upstream. The clamp accepts 2 × (0.5 … 2.5 mm²) solid or stranded, which covers most motor feeder cables up to about 2.5 mm² per phase.
DIN-rail fit and panel integration
The 3RV2011-1FA25 occupies a 45 mm wide footprint on the DIN rail, 106 mm tall, 97 mm deep. Clearance requirements: 50 mm above and below, 30 mm to the side for heat dissipation and arc venting. That is tight enough for a standard 600 mm wide enclosure to hold a dozen of these across a row, with room for a terminal block strip below. The spring terminals face forward, so gland-plate wiring is straightforward — strip 8 mm, push in, done.