The FM1D20 series electronic time controls are for ventilating, heating, cooling, lighting or other electrical loads in commercial and industrial applications. These one-channel time switches are programmable for 24 hr or 7-day schedules. They are intended for either panel, surface, flush, or DIN-rail mounting. Flush and surface/DIN-rail (A & E models) are completely enclosed in a plastic housing and include a terminal cover, dust cover and subbase for installation and hard wiring.