Product Description This is a high-quality, high-power SCR (Silicon Controlled Rectifier) voltage regulator with stepless adjustment, usable for regulating speed, temperature, voltage, and brightness. It utilizes a high-temperature resistant FR-4 circuit board, imported SCR chip, an all-aluminum heatsink, precision resistors, and high-voltage capacitors. Independent switch control allows for free adjustment of input power and power-off. No delay, no hysteresis, and a peak voltage absorption circuit effectively protects the high-power SCR. You can try it out. Product Features: Mini size, portable and lightweight, powerful, and easy to use. High-power SCR voltage regulator with stepless adjustment, allowing for adjustment of speed, temperature, voltage, and brightness. Utilizes a high-temperature resistant FR-4 circuit board, original imported SCR chip, an all-aluminum heatsink, precision resistors, and high-voltage capacitors. Independent switch control allows for free control of input power and power-off. No delay, no hysteresis, and a peak voltage absorption circuit effectively protects the high-power SCR. Features surge protection, spike protection, RC absorption, and other multiple protection functions. Flame-retardant and insulated shell, high temperature resistant, rust-proof, high pressure resistant, and durable. Utilizing a multi-functional industrial socket with thickened copper components, ensuring good contact and reliable safety. User-friendly mounting hole design allows for floor or hanging placement as needed. Quiet operation, energy saving, stable noise reduction, and wide range of applications. Suitable for various electrical components, such as electric furnaces, water heaters, heat exchange lamp dimming, small motors, welding temperatures, etc. Precautions: When measuring the output voltage under no-load conditions, the reading is a virtual voltage. A load of 20W or higher must be connected to measure the correct output voltage. Input AC, output AC, not DC. The 4000W mentioned above refers to the maximum power under resistive loads. The power of inductive loads is 1/3 of the resistive load. Resistive loads refer to inductive loads, such as tungsten filament lamps or heating wires, series motors, and electronic products on circuit boards; extreme caution is required when using these. This product has a metal shell and must be safely grounded. Specifications: Name: SCR Voltage Regulator Model: NHT-4000W Material: Aluminum Color: Black Input Voltage: AC 220V Output Voltage: 0-220V Maximum Power: 4000W Voltage Adjustment Range: 0-220V Rated Current: 9A Maximum Current: 18A Main Unit Dimensions: 115 * 100 * 83mm / 4.53 * 3.94 * 3.27in Product Weight: 459g / 1.01lb Package Dimensions: 180 * 100 * 115mm / 7.09 * 3.94 * 4.53in Package Weight: 522g / Package List: 1.15 lbs, Includes: 1 SCR Voltage Regulator