The ABB A16L-80L-00-84 is an 8-pole mechanically held lighting contactor — a latching contactor that stays in its last commanded state without continuous coil power, so it runs cool and draws no holding current after the switch pulse.
What the mechanically held design means on the panel
Because the contactor latches mechanically, the coil is energized only during the switch transition — typically a 50–100 ms pulse. That eliminates the continuous heat load a standard contactor would dump into the enclosure, which matters when the lighting contactor shares a DIN-rail panel with PLCs, power supplies, or temperature-sensitive controls. The 8-pole configuration handles multi-circuit lighting banks in a single device footprint, saving rail space versus ganging multiple 2- or 4-pole contactors.