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Specifications: Product Name: 4000W AC voltage regulator Size: length: (L*W*H): 85*55*38mm / three * 2 * 1 inches ,knob gap 6mm Maximum power: 4000W (resistive load limit power), long time should be decreased power use Long time resistance load commended inside 2000 Efficiency: greater than 90% Working voltage: AC 220V Adjust the voltage: AC 0-220V Voltage adjustment range: AC 0-220V, Resistive load conditions, starting a dozen volts, callback would be zero Note that the burden must be linked earlier than it can be regulated SCR is especially used for resistive load (electric twine incandescent lamp, etc), single-phase AC motor can also be, yet no longer assured can, different forms of load, please confirm on your own Fuses are not omnipotent, there may be response time, if the present is simply too large, besides burning the fuse, the module also can burn out Some Application: Electric furnace, water heater, lamps, small motor, electric iron etc: Load would not exceed the maximum power, in any other case it'll burn module and electrical appliances; use the resistive load as a long way as possible; cut inductive and capacitive load energy significantly ( you should go away greater than half them) Type: Governor/Regulator/Motor pace controller/Dimmer Module Package Included: 1 x AC 220V 4000W SCR Voltage Regulator Dimmer Motor Speed Controller Module