What it is, what it does
The Eaton A16-012-00-84 is a 12-pole normally-closed contactor from the A16 series, with a dual-frequency coil rated 110 V at 50 Hz and 120 V at 60 Hz. That coil rating means it drops straight into panels wired for either common North American or European control voltage — no transformer swap needed if you're running 120 V 60 Hz stateside or 110 V 50 Hz overseas. The 12 normally-closed poles make it the right call for fail-safe or holding circuits where the load stays powered unless the coil is deliberately energized.