Features:6. Long service life: Flame retardant and outshell insulation, high temperature resistant, rust resistant, high pressure against and fine durability.7. High security: Adopt multi-functional industrial sockets, link copper parts design, with good contact and safety.8. Humanized installation: Humanized installation hole design, keep flat surface or hang it is decided by yourself.9. Wide range of use: Quiet work, energy saving, stable anti-noise and with wide range of use.Suitable for electrical components, such as: electric cooker, water heater, soft extinguishing heat transfer lamp, small motor, electric soldering temperature and etc.Remarks:When measuring the output voltage when empty, it is a virtual voltage.It must be connected to a load of 20W or more to measure the correct output voltage.AC power input, output is also AC, DC no.Mentioned above refers to 4000W the ultimate power output when working under a resistive load.The inductive load is 1/3 of the resistive load.The resistive load means than inductive load, such as a tungsten filament lamp or heating wire is a series excited motor, etc., and electronic products circuit board prints are used with caution.This product is a metal enclosure and must be safely grounded.Package list:1 * SCR voltage regulatorSpecifications:Name:SCR voltage regulatorModel:NHT-4000WMaterial: aluminumColor: blackInput Voltage:AC 220VOutput voltage:0-220VMaximum power: 4000WVoltage adjustment range: 0-220VRated current: 9AMax current:18AMain machine size: 115*100*83mm/4.53*3.94*3.27inItem Weight: 459g / 1.01lbPackage size: 180*100*115mm/7.09*3.94*4.53inPackage weight 522g / 1.15lb