Item Type: AC Voltage Regulator_x000D_ Material: Cold rolled steel, aluminum alloy, thyristor, PCB_x000D_ 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._x000D_ ItemParameter_x000D_ Output voltage0-220V adjustable (Voltmeter does not work when the output voltage is lower than 5V)_x000D_ Limit power4000W (adapt to 2000W-3000W resistive load)_x000D_ Regulating range0-220V steplessly adjustable (under load condition) step-down to 0V, step-up 10V_x000D_ Rated current9A_x000D_ Limit current18A_x000D_ Overload protection switchYes_x000D_ Thyristor modelSTMicroelectronics, Thyristor: BTA41-600B/800B_x000D_ Size: Approx._x000D_ 5.3cm / 2.1in_x000D_ 10cm / 3.9in_x000D_ 8.4cm / 3.3in_x000D_ _x000D_ Precautions and Instructions for Use: _x000D_ 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_x000D_ 2. Input AC power, the output is also AC, not DC._x000D_ 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._x000D_ 4. The metal shell of this product must be safely grounded