AC 220V 4000W SCR Electric Voltage Regulator Dimmer Temperature Motor Speed Controller With Fan    Feature:      - Voltage: AC 0-220V   - Maximum power: 4000W   - Voltage Regulation: AC 0-220V  - Max current: 20A  - Dimensions: 85(L) x 60(W) x45(H) MM  - Can work for a long time in 3000-4000W with the fan  Description:  - The role of the product access AC 0-220V、 output is connected to the electric wire or electrical appliances、 rotary potentiometer、 can play speed、 pressure、 thermostat. - Using the new two-way high-power thyristor、 because the design maximum current can reach 20A、 a good solution to the problem of over-current electric wire in the case of    cooling caused by the resistance is too small、 can easily adjust the output voltage at DC0 ~ any adjustment between DC220V  Note:  - The load can not exceed the specified maximum power、 otherwise it will burn the module and electrical. - Try using a resistive load、 inductive capacitive load power to be greatly reduced. - Do not try to open or modify regulator.  Package included:  1 x SCR Electric Voltage Regulator With Fan