The Phase Monitoring Relay is designed to monitor single- or three-phase over- and undervoltage, as well as phase loss. It features a neutral connection for added convenience. The measuring range for line-to-line voltage is 320 to 460 VAC, while the measuring range for line-to-neutral voltage is 185 to 265 VAC. This relay operates with a rated control supply voltage of either 320 to 460 VAC or 185 to 265 VAC. Additionally, it has one normally open (NO) output.