The single normally-open contact switches the line while the integrated neutral pole switches the neutral, so it isolates both conductors when tripped or manually opened.
The 230 V AC operating voltage is fixed — no dual-voltage or DC capability here. If your panel runs 400 V three-phase or a DC bus, this part won't work. The 1P+N design means it switches both line and neutral, which is common for final subcircuits where you want full isolation on a single-phase feed.
At 2 MW (36 mm wide), it leaves room for adjacent breakers or contactors in a crowded enclosure. IP20 means it's for use inside a panel with a door or cover — no washdown or outdoor exposure. The single NO contact is wired to the overvoltage/undervoltage trip coil; the neutral pole is internally switched, so no separate neutral bar connection is needed downstream of the device.