The 2866048 is a monitoring relay designed to monitor single-phase AC or DC voltages from 0 to 300V. It provides flexible monitoring for overvoltage, undervoltage, or a defined voltage window, and includes an error memory function. The device is equipped with a wide-range power supply, two PDT output contacts, and allows for separate adjustment of startup and response delays. With status indication via colored LEDs and DIN rail mounting, this relay is ideal for ensuring system availability and safety in plant, automation, and power engineering applications.