It's built for 3-phase main circuits, with three poles and screw-type box terminals on both the main and auxiliary sides.
That 0 mm spacing means you can pack breakers tight on the rail without derating for airflow — handy in a crowded enclosure. The IP20 front protection keeps fingers out but doesn't seal against dust or moisture, so this belongs inside a cabinet, not out on a washdown line. Wire range is generous: solid up to 2x 16 mm², stranded up to 2x 25 mm², with a single 35 mm² allowed on the stranded side. That covers most motor feeder cables up to about 11 kW at 400 V.
The breaker includes phase-failure detection, so it will trip if one phase drops out — a common cause of single-phasing motor damage. There's no ground-fault detection built in, so if you need that, you'll add a separate module or relay. The auxiliary switch option is available as a product extension, meaning you can snap on a signal contact for remote status. Operating frequency is rated at a maximum of 15 operations per hour under AC-3 duty, which is fine for occasional start/stop cycles but not for high-repetition jogging applications. Power dissipation at rated current runs 14.5 W total, about 4.8 W per pole — factor that into your enclosure thermal calculation.