It is a kind of beautiful high quality SCR voltage power regulator, worry-free regulation, help adjust speed, temperature, voltage and light. Adopt high temperature resistant FR-4 circuit board, original imported SCR chip, full thermal aluminum fin, with precision high voltage capacitor resistance. Separate switch control, freely control the input power and cut off the power. No delay and postponement, with peak voltage absorb circuit, can protect the high power SCR effective. You can try. Specifications: Name: SCR voltage regulator Model: NHT-4000W Material: < p> aluminum Color black Input voltage: < p> AC 220 V Output voltage: 0-220 V Maximum power: 4000W Voltage adjustment range: 0-220 V Rated current: < /p> 9A Max current: < p>18A Main machine size: 115 * 100 * 83mm / 4.53 * 3.94 * 3.27in Item Weight: 459g / 1.01lb Package size: 180 * 100 * 115mm / 7.09 * 3.94 * 4.53in Package weight 522 g / 1.15lb Features: 1. Small: Mini size, portable power and lightweight, sturdy, easy to use. < p> 2. Worry-free regulation < /p> :?High power SCR voltage regulator, worry-free regulation, help adjust speed, temperature, voltage and light. 3. Good inside :?Adopt high temperature resistant FR-4 circuit board, original imported SCR chip, full thermal aluminum fin, with precision high voltage capacitor resistance. < /p> 4. Convenient: < p> Separate switch control, freely control the input power and cut off the power. 5. Good Protection : No delay and postponement, with peak voltage absorb circuit, can protect the high power SCR effective. Anti-surge, anti-spike, RC absorb and multiple protection. 6. Long service life: Outshell flame retardant and insulating agent, high temperature resistant, rust resistant, high pressure against and a sustainability fine. 7. < /p> High security: Adopt multi-functional industrial sockets, link copper parts design, with good contact and security. 8. Humanized installation : Humanized installation hole design, keep flat surface or hung it is decided by yourself. 9. Wide range of use: Quiet work, energy saving, anti-noise stable and with a wide range of use. Suitable for electrical components, such as: electric cooker, water heater, gradual extinguishing heat transfer lamp, small motor, electric soldering temperature and etc.. < /p> Notes: When measuring the output voltage when empty, it is a virtual tension. It must be connected to a load of 20W or more to measure the correct output voltage. AC power input, the output is also AC, DC no. Above mentioned 4000W refers to the ultimate mate power when working under resistive load. The inductive load is 1/3 of the resistive load. The resistive load means than inductive load, such as tungsten filament lamp or heating wire is excited series motor, etc., and electronic products circuit board are used with caution. This product is a metal enclosure and must be safely grounded. Package list: 1 * SCR voltage regulator