It is a 3-pole device rated for AC-3 duty at 12 A up to 440 V, with a 400 V AC coil and one normally open auxiliary contact. The IP20 finger-safe enclosure (per VDE 0106) suits it for enclosed control panels where accidental contact with live parts must be prevented during maintenance.
This order code is classified as Obsolete by the manufacturer. No official successor order code exists.
The AC-3 rating of 12 A at 440 V governs motor switching: it handles starting and disconnecting squirrel-cage motors up to that current, covering small conveyors, pumps, and fans. The AC-1 rating (resistive load) is higher but not the limiting case for motor duty. The 400 V AC coil must match the control voltage in the panel — verify your control transformer taps before specifying. Dimensions of 90 mm wide by 58 mm high by 57 mm deep fit a standard DIN-rail footprint, but the reversing busbar adds width compared to a single contactor; check panel fill factor against the existing gland plate layout.