This is a type of fine quality high power SCR voltage regulator, stepless regulation, helps to adjust speed, temperature, voltage, and light. Adopt high temperature resistant FR-4 circuit board, original imported SCR chip, full aluminum thermal fin, precision resistor with high voltage capacitor. Separate switch, freely control input power and turn off power. No carryover and no delay, with peak voltage absorption circuit. You can have a try. Features: Mini size, portable and lightweight, high power, easy to use. High power SCR voltage regulator, stepless regulation, helps to adjust speed, temperature, voltage and light. Adopt FR-4 high temperature resistant circuit board, original imported SCR chip, fully heat-resistant thermal fin made of aluminum, a precision resistor with a high voltage capacitor. Separate switch, freely control input power and turn off power. No carryover and no delay, with peak voltage absorption circuit. Flame retardant insulating outer shell, high temperature resistant, anti-rust, anti-high pressure and with high durability. Adopt multi-functional industrial socket, thickened copper parts design, with fine contact and safety. Humanized installation hole design, keep a flat place or hang on it is determined by you-even. Quiet work, energy saving, stable anti-noise and with a wide range of applications. Suitable for electrical components, such as: electric stove, water heater, heat transfer lamp dimming, small motor, electric soldering temperature, etc. Notes: When measuring the output voltage when it is empty, it is a virtual voltage. It must be connected to a load of 20W or more to measure the correct output voltage. AC power supply, the output is also AC, not DC. The 4000W mentioned above refers to the ultimate power when working under resistive load. Inductive load is 1/3 of resistive load. Resistive load means that the inductive load such as tungsten filament bulb or heating wire is series-excited motor, etc., and the circuit board electronic products are used with caution. This product is a metal casing and must be safely grounded. Features: Name: SCR voltage regulator Model: NHT-4000W Material: aluminum Color: black Max power: 4000W Rated current: 9A Maximum current: 18A Main machine size: 115 * 100 * 83 mm / 4.53 * 3.94 * 3.27in Item weight: 459 g / 1.01lb Package size: 180 * 100 * 115 mm / 7.09 * 3.94 * 4.53in Package weight: 522 g / 1.15lb Package list: 1 * SCR voltage regulator