Features: AC 0V-220V continuously adjustable, zero hysteresis, zero latency, superior heat dissipation. Can be used in many places, such as: furnace, hot water heater tune, dimming lamps, small motor speed, electric iron thermostat and so on, so as to achieve dimming, thermostats, voltage regulating effect. Using the new two-way high-power thyristor, current up to 40A, a good solution to the problem of over-current electric wire in the case of cooling the resistance is too small to cause. For electric power is less than 2000W of large electrical appliances , so the general home appliances or small factories are enough to use. Gently rotate knob cap, can adjust flexibly, do not need to add any element, the product is practical, convenient. Specifications: Input voltage: AC 220V Output voltage: AC 0-220VMaximum power: 4000W(Note that this is short-time limiting power ) Size:100 x 85 x 53mm or 3.94x 3.35 x 2.09 inch Plug: CN plug Weight: 450gUsage: Voltage controller and desk lamp, electrical appliances are connected in series in the circuit (namely, disconnect any one of the neutral wire or live wire of the desklamp, electrical appliances, pick up on the voltage controller terminal ), turn the knob cap, canadjust the light, speed, temperature,voltage regulating simple and convenient operation. Package Included: 1 x Variable Voltage Controller Use Note:1. The output voltage measured at no-load is a virtual voltage, and it must be connected to a load of more than 20W to measure the correct output voltage2. The input is AC, the output is also AC, DC does not support3. Product power 4000 refers to the limit power when working under limit load4. Adjustable devices are:Motors: fans, exhaust fans, ceiling fans, snail fans, and other fans without capacitorsHeating categories: electric heating wire, electric heating fan, kettle, electric heating pot, heating rod, etc.Dimming type: tungsten filament lampPower tools: angle grinders, electric screwdrivers, hand drills, chainsaws, etc.5. Does not support adjustment:Electronic products with circuit boards are not supported, single-phase motors, washing machine motors, dual-value capacitor motors, asynchronous motors, water pumps, negative pressure fans, and centrifugal fans are not supported.6. Use power:4000w governor The resistive load is recommended to be within 2000w, and the inductive load is within 1800wThe resistive load of the 10000wi governor is recommended to be within 4000W, and the inductive load is within 3800W.Note: 1. Voltage can be adjusted only under load conditions.2. Partial line of the module back side is treated with copper. The customer of the large current application should tin plating according to the need..