The 84872141 is a voltage control relay designed for monitoring and detecting overvoltage or undervoltage conditions with a selectable latching (memory) function. It features automatic AC/DC recognition, True RMS measurement, and operates over a measuring range of 20–80 V AC with a power supply of 24–48 V AC. The relay provides 1 changeover contact rated at 5 A with a maximum switching power of 2500 VA (300 W resistive), and includes LED status indication for operational monitoring. It is suitable for industrial control applications requiring reliable voltage monitoring, protection circuits, and automated shutdown or alarm systems where memory function prevents nuisance trips.