The LP4K12017BW3 is a TeSys K 3-pole contactor from Schneider Electric, rated for AC-3 duty at 12 A up to 440 V with a 24 VDC coil. The coil includes a built-in bidirectional peak limiting diode suppressor, which means you don't need to add an external flyback diode or RC snubber across the coil — the suppression is inside the contactor, saving panel space and one wiring step.
That's a compact footprint for a 12 A contactor — fits a standard DIN-rail slot with room for a thermal overload relay alongside. The 1 NC auxiliary contact is built in, so no separate aux block needed for a basic interlock or status feedback.