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This is a 4000W Thyristor SCR Voltage Regulator Temperature Dimmer for Speed / Light (AC 220V). 4000W Thyristor SCR Voltage Regulator is SCR Dimmer which can be used to control 220V Appliances. It can be used as a light dimmer, fan speed controller, stove temperature controller. It is easy and simple to use and can control appliances up to 4000W!Just give AC input to the module and connect the appliance at the output of the module, then use the onboard potentiometer knob to adjust and set the required power output from your 220V DeviceElectric furnace,water heater,lamps,small motor,electric iron.etccan apply to the use of new two-way high-power thyristor; As the current up to, a good solution to the heating wire resistance in the case of cooling is too small to cause over-current problems; can easily adjust the electricity.The output voltage between 0 – 220 volts any adjustment for the use of electrical appliances.Such as furnace, water heaters, heat transfer, light dimming, small motor speed, electric iron thermostat, and so on.High-Power 4000W SCR Voltage Regulator Dimmer Speed Temperature Controller AC 220V 4000W Best For AC Light Fan Dimmer