Phoenix Contact 1487448 This is a three-phase voltage monitoring relay that features an RS-485 interface for AC voltages between 160...690V, offering functions such as overvoltage, undervoltage, window, phase sequence, loss failure, and asymmetry monitoring with adjustable sensitivity. It has a versatile power supply suitable for both AC and DC input voltages of 24...240V, allowing users to set custom threshold values and response delay times. Additionally, it supports storage of failure records, NFC communication, Modbus/RTU communication options, and has two configuration possibilities, accompanied by a single PDT dry contact output that can be easily plugged into.