The 84871120 is a current control relay designed for monitoring AC or DC currents in either overcurrent or undercurrent modes. It operates on a wide supply voltage range from 24 to 240V AC/DC and features a selectable measurement range from 2mA to 500mA with True RMS measurement. The relay includes a double changeover output, adjustable time delays for power-up (1-20s) and threshold crossing (0.1-3s), and an adjustable hysteresis from 5% to 50% of the set threshold. Housed in a 35mm DIN rail compatible casing, this device is suitable for industrial process control and equipment protection where precise current monitoring is required.