1With standard modular construction, the product is installed through guide rail and no additional auxiliary power is required. 2The over under voltage protector possesses 2 sets of normally open and normally closed contacts, and 5 indicators indicating various working conditions. 3The overvoltage and undervoltage value is independently adjustable and the action time is adjustable. 4Voltage monitor relay can realize realtime monitoring of threephase overvoltage, undervoltage, out of phase, phase loss, voltage unbalance, and neutral disconnection faults. 5The product cn an be used in electric motors, fans, water pumps, air compressors, cranes, driving, lifts, elevators, machine tools, central air conditioners, refrigeration equipment, industrial control systems, etc. Item Type:OverUnderVoltageProtector Model: JVRD-380W Detection Circuit: L1, L2, L3 or L1, L2, L3, N Rated Voltage: 380VAC 50/60Hz Overvoltage Setting: +2 - 20% Undervoltage Setting: -2 - 20% Protection Function: Overvoltage, undervoltage, out of phase, phase loss, unbalanced voltage, and neutral line disconnection Display Mode: Overvoltage, undervoltage, wrong phase, lack of phase, normal 5 LED lights indicate working status Contact Form: 1 set of normally closed contacts + 1 set of changeover contacts Contact Capacity: 250V/AC 6A Rated Current: 3 (A) Installation Method: 35mm rail Typical Application: Motor, fan, water pump, air compressor, crane, driving, lift, elevator, machine tool, central air conditioner, refrigeration equipment, laser equipment and industrial control system. 1 x OverUnderVoltageProtector1 x User ManualWiring according to the wiring diagram in the manual.