RL 9877 and RN 9877 VARIMETER Phase Monitor Relays Datasheet

This document details the RL 9877 and RN 9877 VARIMETER series measuring relays, which monitor overvoltage, undervoltage, voltage range, phase asymmetry, phase sequence, and phase failure in 3-phase or single-phase systems without needing an auxiliary power supply. It includes technical specifications, part numbers, pricing, and application information for these DIN rail-mount relays from AutomationDirect.