Monitor one source 3 phase voltage Monitor over voltage, under voltage, miss phase. The point of over voltage, under voltage is adjustable. The timer of voltage abnormal delay is adjustable, The output is a relay free voltage contact. Module structure design, ABS plastic , rail installation, plug connector. convenient maintenance. Input voltage: 380VAC 50 or 60Hz 3-phase 3 wires Power consumption Less than 1VA Over voltage range: 105percent -125percent Rated Under voltage range: 75percent -95percent Rated Delay of voltage abnormal: 0- Relay output capacitance: AC250V 7A 35mm rail installation Operation temperature: -25 to and70C Case and Application L1,L2,L3: 3 phase voltage input NO,COM,NC:Normal Open Contact, Common Contact, Normal Close Contact of the output relay. OVER: The potentiometer of Over Voltage. UNDER: The potentiometer of Under Voltage. DELAY: The potentiometer of voltage abnormal delay MISS PHASE: Miss Phase indication. OVER: Over Voltage Indication. UNDER: Under Voltage indication. NORMAL: Voltage Normal output indication. Color: As Shown Material: ABS Package Contents: 1x Voltage Protection Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.