Time Mark 260 SeriesOver or Under Voltage Monitor? Automatic Reset, 50-400 Hz Plug-in Mounting 5 Year Unconditional Warranty Monitors for Over or Under Voltage LED status indicatorThe Model 260 Voltage Sensor is a single setpoint voltage sensor. Input voltages above the setpoint cause the output contacts to energize (contacts 1 & 8 closed). Input voltages below the setpoint cause the output contacts to de-energize (contacts 1 & 2 closed). The dead band between pull-in and drop-out is less than 2%. The standard unit has a screwdriver, or fingertip adjustable setpoint range of approximately 35% of the maximum voltage. This device can also be provided with a factorycalibrated trip point. AC versions of the Model 260 Voltage Sensor are not frequency sensitive, and may be used in systems from 50Hz to 400Hz. DC models are not polarity sensitive. This device requires a standard 8-pin socket, such as Time Mark's Model 51X120.