What it is and what it does
The Omron J7K-FM-110V50HZ/120V60HZ is a contactor from the J7K-FM series, used to switch power to motor loads, resistive heating, and other inductive or resistive circuits in control panels. Its coil accepts 110 V at 50 Hz or 120 V at 60 Hz — a dual-frequency design that lets the same part work across 50 Hz and 60 Hz mains without a coil change. This is the key fit parameter: match your control voltage and line frequency, and the contactor is ready for the panel.