It's built for protecting motors against overload and short-circuit, and it includes phase failure detection so it catches a lost phase before the winding temperature climbs. The spring-loaded terminals accept 2x 0.5 to 2.5 mm² solid or stranded, so you're not fighting screw clamps on a midnight startup.
The 3RV2011-4AA20-0BA0 offers a rated short-circuit breaking capacity of 30 kA at 400 V AC (Icu), with an Ics of 55 kA at the same voltage. That's a 1.8x ratio — the Ics exceeds Icu, unusual for this class, meaning it can clear a fault and still be reused in most cases without derating the circuit. The gG fuse backup ratings at 400 V (63 A), 500 V (50 A), and 690 V (40 A) give you a selectivity window for upstream protection.
Spring-loaded terminals on the main circuit accept 2x 0.5 to 2.5 mm² solid or stranded — tool-free push-in for the power wiring, which shaves a minute per connection on the panel build. The screwdriver shaft diameter is 3 mm for the auxiliary terminal screws. Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the side, 0 mm forwards and backwards — so you can butt it against the back panel and adjacent breakers without extra spacing. That's tight packing for a 45 mm wide device.