Phase Monitor Relay, Input or Control Voltage 190 to 500V AC, AC Contact Rating - Relay 10A @ 277V, DC Contact Rating - Relay 7A @ 30V, Base Type - Plug In Relay Octal, Number of Pins - Relay 8, Mounting - Relay Plug In, Contact Form - Relay SPDT, Over Voltage Fixed 110 Percent of Line Voltage Setting, Under Voltage 171 to 450V AC, Phase Loss Sensitivity Yes, Phase Reversal Yes, Phase Unbalance Fixed 6 Percent, Restart Auto, Manual, Socket Code - Relay A