The Reliance Series 200A Programmable time switches are exceptionally easy to install and set. User-friendliness and rugged construction combine to make them ideal for most commercial and residential installations. The Series 200A features a 24-hour dial with 96 permanently attached sliding trippers. Each tripper permits 15 minutes of ON/OFF time in quarter hour increments. The Series 200A time switches feature a quartz drive powered by a rechargeable NiCAD battery and provide a carryover of 90 hours in the event of a power interruption. The 200A is a high-tech, low-cost alternative to a mechanical carryover time switch. The 200A is solid-state technology with mechanical simplicity. The best of both worlds.