High quality: High-performance SCR is used as the internal chip. Thickened metal casing, high temperature resistant, long service life, not less than 60W, less than 60W can not be adjusted. Perfect performance: Power regulator with Knob step voltage adjustment, zero offset, zero delay, fast response. Not suitable for pumps, living vessels or brushless motors that do not support voltage step-down to reduce speed. The AC voltage regulator cover is equipped with a universal multi-purpose socket and a current display. Effectively protect high-performance thyristors from overvoltage and voltage limits with multiple protection Note 1: The above-mentioned 4000W refers to the maximum power when working under ohmic loads. The power under inductive load is 1/3 of the ohmic load. The ohmic load is for Wolframlampt Diew. on the line excitation motor and more. Electronic products with printed circuit boards should be used with caution. Note 2: The measured output voltage is a virtual voltage if there is no load. It must be connected to a load of 20W or more to measure the correct output voltage. The output is a Wehtselstrom metal shell and must be safely grounded. Specification Model: BTA-4000W Input Voltage Power: AC 220V Plug Type: EU Plug Output Voltage: 0-220V continuously adjustable (voltmeter does not work if the output voltage is lower than 5V) 2000 ohmic spirit Lemmer Lester W up to 3000 W) Rated Current: 9A Limit Current: 18A Package Weight: Approx. 507g Package List 1 x 220V Speed Controller