Item Type: AC Voltage Regulator Material: Cold rolled steel, aluminum alloy, thyristor, PCB Uses: High-power thyristor voltage regulation, speed regulation, temperature regulation, and dimming applications. Household appliances, industrial electrical appliances, scientific test equipment, electrical equipment for factories, schools, etc. ItemParameter Output voltage0-220V adjustable (Voltmeter does not work when the output voltage is lower than 5V) Limit power4000W (adapt to 2000W-3000W resistive load) Regulating range0-220V steplessly adjustable (under load condition) step-down to 0V, step-up 10V Rated current9A Limit current18A Overload protection switchYes Output power indicatorYes Thyristor modelSTMicroelectronics, Thyristor: BTA41-600B/800B Size: Approx.Precautions And Instructions for Use: 1. When the machine is empty, the measured output voltage is a virtual voltage, and a load above 20W must be connected to measure the correct output voltage 2. Input AC power, the output is also AC, not DC. 3. The 4000W mentioned above refers to the limit power when working in a resistive load. The inductive load is 1/3 of the resistive load. The resistive load refers to the tungsten filament lamp, heating wire, etc., and the inductive load refers to the series motor. And so on, there are circuit board electronic products used with caution. 4. The metal shell of this product must be safely grounded 6cm / 2.4in 10cm / 3.9in 9cm / 3.5in 11.5cm / 4.5in Adjustable equipment: motor class: fans, exhaust fans, ceiling fans, snail fans, and other fans without capacitors. Heating category: electric heating wire, electric heating fan, kettle, electric heating pot, heating rod, etc. Dimming category: tungsten lamps. Power tools: angle grinder, electric screwdriver, hand drill, chainsaw, etc. Does not support the regulation of equipment: with circuit board electronic products are not supported, single-phase motors, washing machine motors, dual-value capacitor motors, asynchronous motors, pumps, negative pressure fans, centrifugal fans.