Features Three phase voltage protector, chronograph and counter are integrated into one relay. It is equipped with protective functions for over-voltage, under-voltage, loss of phase, phase sequence and unbalanced three phase voltage. No external power requires. With useful functions: electricity delay, output test, etc. The LCD can show the data for easy reading. Specification: Model: JVR 800-2 Monitoring Circuit: L1, L2, L3 Rated voltage: 208-480V AC, 50/60Hz Protection: over-voltage, under-voltage, voltage unbalance, phase loss, phase sequence, counter Overvoltage setting range: 200-600V Undervoltage setting range: 150-500V Voltage hysteresis: 1-20V Delay time for overvoltage and undervoltage: 0.1-30s Voltage unbalance ratio: 1-50% Voltage unbalance hysteresis: 1-10% Voltage unbalance delay time: 0.1-30s Delay time for phase loss: 0.1-30s Delay time for phase sequence: 0.1-30s Start delay time: 0-999s Auto reset mode: ON/OFF Auto reset time: 0.1-999s Timer and counter input: AC/DC 80-450V Indicators: LCD indicating voltage,current,operation status Output contacts: 1 C/O,1NC Contact capacity: 6A ,250VAC Dimensions (H*W*D): 80*43*54mm/3.15*1.69*2.12inch Mounting: suitable for 35mm rail Weight: 129g Package List: 1 x 3 Phase Voltage Monitoring Relay Package List 1 x 3 Phase Voltage Monitoring Relay