The new bidirectional high-power thyristor is used, because the current can reach 40 amps, which solves the over-current problem caused by the resistance of the electric furnace wire being too small under cooling.<br> 0-100% (220 volts, 100-level adjustment, non-linear) can be adjusted arbitrarily for electrical appliances. Such as: electric furnace, water heater, dimming of lamps, small motor speed, electric iron temperature.<br> So as to achieve the effects of dimming, temperature and pressure. Available for large appliances with an electric power of less than 2000 watts.<br> Because the power is already large, ordinary household appliances or small factories are sufficient. (This voltage regulator is equipped with bidirectional high-power thyristor, which can be used without adding any components, which is very convenient and practical). Comes with a heat sink.<br> Voltage: AC 220V<br> Maximum Power: 4000W resistive load limit power, it is recommended to use within 2000W for a long time at room temperature<br> Voltage Adjustment: 0-100% (220 volts divided into 100 levels, non-linear)<br> Material: PCB+Metal+Electronic accessories<br> colour: As shown<br> Package Contents:<br> 1 x 4000W Voltage Regulator<br> 1 x Switch Panel<br> 1 x Cable<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.