--- product_id: 638393870 title: "4000W AC Variable Speed Controller" brand: "sdrgeek" price: "NT$2135" currency: TWD in_stock: true reviews_count: 8 category: "Sdrgeek" url: https://www.desertcart.tw/products/638393870-4000w-ac-variable-speed-controller store_origin: TW region: Taiwan --- # 15A max current 4000W max resistive load 0-220V adjustable output 4000W AC Variable Speed Controller **Brand:** sdrgeek **Price:** NT$2135 **Availability:** ✅ In Stock ## Summary > ⚙️ Master your motor’s rhythm with precision power control! ## Quick Answers - **What is this?** 4000W AC Variable Speed Controller by sdrgeek - **How much does it cost?** NT$2135 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/638393870-4000w-ac-variable-speed-controller) ## Best For - sdrgeek enthusiasts ## Why This Product - Trusted sdrgeek brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Industrial-Grade Safety:** Zero hysteresis with peak absorption circuit protects against spikes and overheating. - • **Precision Power Control:** Seamlessly adjust voltage from 0 to 220V for tailored motor speed and fan airflow. - • **Robust High-Temp Design:** All-aluminum heat sinks and FR-4 circuit boards ensure durability under intense conditions. - • **Compact & Grounded Metal Case:** Sleek, grounded metal housing combines safety with professional-grade reliability. - • **Versatile Appliance Compatibility:** Perfect for fans, routers, heaters, and electric motors—empower your workspace or home setup. ## Overview The SDRGEEK AC Variable Speed Controller offers professional-grade voltage regulation from 0 to 220V with a robust 15A current capacity and up to 4000W power handling for resistive loads. Engineered with high-quality SMD thyristors, aluminum heat sinks, and durable FR-4 circuit boards, it ensures reliable, safe operation for a wide range of appliances including fans, routers, and electric motors. Its metal grounded case and advanced protection circuits deliver industrial-level safety and performance, making it an essential tool for millennial professionals seeking precise control and efficiency in their workspace or smart setups. ## Description AC Variable Speed Controller, 120V~220V 15A 4000W SCR Voltage Controller for Router Fan Electric Motor Rheostat - desertcart.com Review: Great motor speed control - Works very well on my bench grinder converted into a buffer Review: Great fan speed controller - I have two Westinghouse table fans from the 1950s. They move a lot of air but they tend to be a bit noisy. When I want a lot of moving air or I want white noise for a sleep, those fans are great. For TV I want much less airflow and much less noise. This controller works perfectly to slow the fan, reduce the air and cut the noise dramatically. I can use the ON/OFF switch without changing the speed setting and the fan returns to the preset speed from the night before. That's just what I wanted. The watt meter on the controller does not show what wattage of this fan. I don't know why and I really don't care. The controller does what I want it to do. ## Features - 【Powerful Functions】Compatible with 120V/220V power input, the maximum current is 15A, the output voltage is adjustable from 0-220V, and the limit power is 400W. 4000W is the maximum power when working under a resistive load, and the inductive load is 1/3 of the resistive load. - 【High-quality Materials】 imported high-quality SMD thyristors, all-aluminum heat sinks are suitable for high-temperature circuits, FR-4 circuit boards are heat-resistant and durable, and double-sided copper layer welding increases safety. Note: The product is a metal case and must be grounded safely! - 【Safe and Reliable】 With zero hysteresis and zero delay, it has a peak absorption circuit, which can effectively protect the high power thyristor from sweat, spikes and RC absorption. It is also equipped with multifunctional industrial sockets and thickened phosphor bronze fittings. Multiple layers of fortification give you comprehensive security protect. - 【Applicable Appliances】 Our AC motor speed controllers can be widely used in fans, electric stoves, water heaters, small motors, electric irons, tungsten lamps and other electrical appliances. At present, most motors do not support voltage regulation (such as single-phase motors, asynchronous motors, dual-value capacitor motors, etc.), and are not suitable for smart home appliances with complex circuit boards. - 【Please Note】 Not suitable for smart appliances with complex circuit boards. The maximum power of connecting inductive loads (such as fans and routers) is about 1500W, and the limit power of connecting resistive loads (such as electric furnaces and heating wires) is 4000W. Resistive loads refer to tungsten lamps, heating wires, etc., and inductive loads refer to series-excited motors. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0C2VLSVR5 | | Best Sellers Rank | #147,103 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #67 in Electrical Motor Controls | | Brand Name | SDRGEEK | | Color | Black | | Customer Reviews | 4.1 4.1 out of 5 stars (165) | | Display Type | LCD or LED | | Included Components | controller | | Item Dimensions L x W x H | 4.49"L x 3.94"W x 3.15"H | | Item Weight | 1.1 Pounds | | Manufacturer | SDRGEEK | | Material Type | Metal | ## Product Details - **Brand:** SDRGEEK - **Color:** Black - **Item Weight:** 1.1 Pounds - **Material:** Metal - **Product Dimensions:** 4.49"L x 3.94"W x 3.15"H ## Images ![4000W AC Variable Speed Controller - Image 1](https://m.media-amazon.com/images/I/71Bx6q70yBL.jpg) ![4000W AC Variable Speed Controller - Image 2](https://m.media-amazon.com/images/I/71OEWrZ2E9L.jpg) ![4000W AC Variable Speed Controller - Image 3](https://m.media-amazon.com/images/I/710-OKUoDNL.jpg) ![4000W AC Variable Speed Controller - Image 4](https://m.media-amazon.com/images/I/71otU-EjseL.jpg) ![4000W AC Variable Speed Controller - Image 5](https://m.media-amazon.com/images/I/71-78CkEYoL.jpg) ## Available Options This product comes in different **Color, Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great motor speed control *by J***Z on March 11, 2026* Works very well on my bench grinder converted into a buffer ### ⭐⭐⭐⭐⭐ Great fan speed controller *by B***T on July 9, 2024* I have two Westinghouse table fans from the 1950s. They move a lot of air but they tend to be a bit noisy. When I want a lot of moving air or I want white noise for a sleep, those fans are great. For TV I want much less airflow and much less noise. This controller works perfectly to slow the fan, reduce the air and cut the noise dramatically. I can use the ON/OFF switch without changing the speed setting and the fan returns to the preset speed from the night before. That's just what I wanted. The watt meter on the controller does not show what wattage of this fan. I don't know why and I really don't care. The controller does what I want it to do. ### ⭐⭐⭐⭐⭐ Problem Solved! *by S***M on August 2, 2025* I had some issues getting this working, the way I wanted it to. But working with the manufacturer I was satisfied with the solutions they provided. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tw/products/638393870-4000w-ac-variable-speed-controller](https://www.desertcart.tw/products/638393870-4000w-ac-variable-speed-controller) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-05-15*