Features With useful functions: electrical delay, output test, etc. Three-phase voltage protector, chronograph and counter are integrated into a relay. It is equipped with protection functions against overvoltage, undervoltage, phase loss, phase order and unbalanced three-phase voltage. No external power supply is required. 2 optional rest module, manual and automatic. LCD screen can display data for easy reading. Specification: Model: JVR 800-2 Monitoring circuit: L1, L2, L3 Rated voltage: 208-480VAC, 50/60Hz. Protection: Over voltage, undervoltage, voltage imbalance, phase loss, phase sequence, counter Surge adjustment range: 200-600V Undervoltage adjustment range: 150-500V Voltage hysteresis: 1-20V Delay time for overvoltage and undervoltage:0.1-30s Voltage Imbalance Rate: 1-50% Voltage imbalance hysteresis: 1-10% Voltage imbalance delay time: 0.1 to 30s Delay time for phase loss: 0.1-30s Delay time for phase sequence: 0.1-30s Startup Time: 0-999s Auto reset mode: on/off Auto reset time: 0.1 to 999s Timer and counter input: AC/DC 80-450V Indicators: LCD showing voltage, current, working status Output contacts: 1 C/O, 1NC Contacts capacity: 6A, 250VAC Dimensions (H*L*D): 80*43*54mm/3.15*1.69*2.12inch Mounting: suitable for 35 mm rails Weight: 129 g Package list: 1 x Three Phase Voltage Monitoring Relay Package List 1 x 3 Phase Voltage Monitoring Relay