1、Adopt high power SCR as the internal chip. 2、Thickening metal shell, high temperature resistant and durable in use. 3、Achieve stepless voltage adjustment by knob. 4、Zero hysteresis, zero delay, fast response. 5、The shell is equipped with a universal multi‑purpose socket and a power indicator. Features: Adopt high power SCR  as the internal chip. Thickening metal shell, high temperature resistant and durable in use. Zero hysteresis, zero delay, fast response. The shell is equipped with a universal multi-purpose socket and a power indicator. Effectively protect high-power thyristor against surge, anti-spike, RC absorption of multiple protection. Specification: Model: BTA-4000W Maximum power: 4000W (fit for 2000W-3000W resistive load) Rated current: 9A Limit current: 18A Package weight: Approx. 507g Package List: Note: 3. The output is AC, not DC. 4. The above mentioned 4000W refers to the maximum power when working under resistive load. The power under inductive load is 1/3 of the resistive load. The resistive load refers to tungsten lamp, heating wire, etc. The inductive load refers to the series excitation motor and more. The electronic products with circuit board should be used with caution. 5. This product has a metal shell and must be grounded safely. 1 x SCR Voltage Regulator