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BDayton three phase monitoring relays continuously monitor voltage inputs of electrical equipment to protect them from damage due to phase loss, reversal & unbalance, and undervoltage & overvoltage faults. They can detect single phasing & continue to monitor even with a lost phase. The plug-in type octal connection provides easy and secure installation. Choose from a wide range of these Dayton 3 phase monitor relays, available in 90 percent nominal voltage and 80 to 95 percent nominal voltage drop out range on Raptor Supplies.