Timer switches control power to electrical devices, turning them on and off at specific times or intervals. Also known as industrial timers and time switches, they connect or disconnect power to machinery, equipment, and lights to manage energy use, automate processes, or make controlling operations more convenient. General purpose timer switches mount onto walls or surfaces near the device they control to automate on/off cycles. In-wall timer switches install into wall electrical boxes to conveniently control appliances and devices. Defrost timer switches regulate on/off defrost cycles for refrigerators and freezers to prevent ice buildup. DIN-rail and panel-mount timer switches install into control panels and equipment racks. Plug-in timer switches insert into wall outlets to control on/off cycles for lamps, decorations, and other plug-in devices. Timer switch trippers and replacement parts repair, maintain, or enhance the functionalities of timer switches.