Phase Monitor Relay, Base Shape Octal, Contact Form SPDT, Contact Rating (AC) 10 A @ 277V, Contact Rating (DC) 7 A @ 30V, Current Rating 10 A, Input Voltage 190 to 500V AC, Monitored Parameters Overvoltage, Phase Loss, Phase Reversal, Phase Unbalance, Undervoltage, Number of Pins 8, Restart Auto, Manual, Restart Time Delay 1 to 300 sec, Mounting Style Plug-In, Body Depth 2.4 in, Body Height 2.9 in, Body Width 1.7 in, Compatible with Grainger Part Number 5X852