1: The 4000W mentioned above refers to the maximum power when working under ohmic loads.The power under inductive load is 1/3 of the ohmic load.The ohmic load concerns Diew.on line excitation motor and more.Electronic products with circuit boards should be used with caution.Noticed 2: The measured output voltage is a virtual voltage if there is no load.It must be connected to a load of 20W or more to measure the correct output voltage.The output is a metal shell and must be safely grounded.Product Description Dimmer, AC 220V 9A 4000W SCR Voltage Regulator Motor Fan Regulator Speed Controller Dimmer It is AC, non-DC, this product is a metal shell and must be on the ground in safe mode.Get stepless voltage adjustment by button,Thickening metal shell, high temperature resistant and durable in use.High quality adopt high performance SCR as internal chip. The AC voltage regulator cover is equipped with a universal multi-purpose socket and current display.Effectively protect high-performance thyristors from overvoltage and voltage limits with multiple protection Note Thick metal shell, high temperature resistant and durable in use.Perfect performance stepless voltage regulation with button, zero hysteresis, zero delay, fast reaction.Quick response The AC voltage regulator has a universal multi-use pressure and a current display Multiple protection Effectively protects you with high voltage protection and RC absorption with multiple protection. High quality: Use high-performance SCR as the internal chip.Thickening metal shell, high temperature resistant and durable in use.Perfect performance: stepless voltage adjustment with rotary knob, zero hysteresis, zero delay, fast response. AC 220V 9A 4000W Voltage Regulator SCR Dimmer Regulator The power is at 1/3 of the ohm level.It is the cause of the resistance to the tungsten lamp, the heating wire and the source of the motor of the line exciter and the other ancora.I produce electronics with an electronic schedule which must be used with a cautela.Note 2: the current voltage is set to a virtual voltage when it is not current, must be set to a voltage of 20 W or higher to allow the current voltage to be correct.Dimmerschalter High Quality Specification Model: BTA-4000W input voltage Power: AC 220V Plug type: EU plug Output voltage: 0-220V continuously adjustable (voltmeter does not work if output voltage is lower than 5V) 2000 ohmic spirits Lemmer Lester W up to 3000 W) Rated current: 9A Limit current: 18A Package weight: approx.507g Package List 1 x 220V Speed Controller