Motor protection circuit breaker for the panel builder
The 3RV1021-4DA10's breaking capacity drops as line voltage rises: 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC. The 6 kV rated surge voltage withstand means the breaker handles switching transients on motor circuits without internal flashover.
Screw-type terminals on both main and auxiliary circuits accept solid or stranded conductors: 2x (1…2.5 mm²) or 2x (2.5…6 mm²), with AWG equivalents 2x (14…10). No backward or side clearance is required, so you can butt it against adjacent devices on the rail. IP20 on the front means the busbars are touch-safe in an enclosed panel; the interior of the cabinet provides the rest of the protection.
Thermal and environmental limits
The 25g / 11 ms shock rating means it survives the vibration and impact typical of machine-mounted panels. Maximum operating frequency is 15 switching cycles per hour in AC-3 duty, which covers normal motor start-stop sequences but not rapid cycling.