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This NSi Industries A530MW spring-wound timed switch accepts 120/277 VAC input and its SPST output contacts can activate a 20 amp load or 2 hp motor. The timer’s twist knob sets time from one to 30 minutes with an automatic Off. The single-pole single-throw (SPST) contacts are housed within a single-gang in-wall switch that is suitable for indoor use and is Underwriter Laboratories (UL) Listed and Canadian Standards Association (CSA) certified for quality assurance. This switch is suitable for controlling lighting and fans.SpecificationsSwitch typeSpring wound timer with twist knobInput power supply120/277 VAC, 50/60 HzOutput contactsSPST contacts, 20 amps load rating, 2 hp motor load ratingOn/off controlOne to 30 minutes with auto OffEnclosureSingle-gang in-wall, white cover plate, indoor useTerminal wire size range#12 AWG (American wire gauge)Operating temperature range32 to +122 degrees F (0 to +50 degrees C)Standards metUL Listed, CSA certifiedAutomatic switches are used to turn on or off electrical devices and are activated by time, light, and motion. Time activated switches (also known as timers) operate at preset time intervals during a daily or weekly period and can be either mechanical or electronic. Mechanical timers feature a dial with multiple pins to set the on/off time intervals. Electronic timers feature an LCD display and pushbuttons to set the time intervals. Light activated switches (also known as optical or photo) operate when ambient light levels reach preset values, generally measured in foot candles. Motion-activated switches (also known as motion sensors)