The Intermatic Pb313Ek is a 24-hour, 120 VAC replacement electronic clock kit. The kit is specifically designed to replace Pb series mechanical timers. The timers are suited to applications where occasional automatic override is required and where equipment must be rotated up to 8 daily on and off cycles. The timers offer robust construction, resistance to moisture and surges. Additionally, when the timers are in position, the indicator light illuminates. For a quick repair or change of a timer.