The 1-1618113-1 is a protective relay from the WUVT/WOVT series designed for undervoltage and overvoltage detection in power systems. It operates across a nominal voltage range of 100 VAC to 575 VAC at line frequencies of 50–400 Hz, with single or three-phase sensing capability. The relay features screwdriver-adjustable setpoints (70–100% of nominal for undervoltage models, 100–125% for overvoltage models) and a time delay range of 0.5 to 20 seconds, with a typical pick-up to drop-out differential of 1%. Output contacts include one normally open and one normally closed set, each rated for 5 amperes resistive at 120 VAC or 28 VDC, with automatic voltage reset when conditions return to normal. The relay operates reliably over a temperature range of -40°C to +70°C with maximum power consumption of 3 VA, and includes standard transient protection to withstand momentary voltage surges up to twice the nominal rated input voltage. This relay is ideal for critical power distribution applications requiring precise voltage monitoring and protection against abnormal voltage conditions.