The LC8K1210M7 is a TeSys K reversing contactor from Schneider Electric — a 3-pole, 3 NO power pole unit rated for AC-3 duty at 12 A up to 440 V, with a 220...230 V AC coil and one normally open auxiliary contact. It ships preassembled with the reversing power busbar, so you don't have to build the mechanical interlock and bus arrangement yourself. The AC-1 and AC-4 utilisation categories are also listed, covering resistive loads and high-inertia reversing duty respectively.
If you are holding a legacy panel with this reversing contactor, the practical advice is to secure a critical spare before the next failure. The TeSys K series is a mature family; while a direct pin-compatible replacement from the current TeSys range may exist, no official cross-reference is recorded here, so verifying the footprint and coil voltage against a modern equivalent is the integrator's step.