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This controller uses novel bi-directional high-power SCR. It can be very convenient adjust the current up to 25A, and solve the over current problem of the heating wire resistance is too small in the case of cooling causing good. Input supply voltage: 110V- 250V AC.Output voltage:50V-250V. The output voltage is adjusted anywhere between 50V-220V for use with electrical appliances. All products are tested for stability, consistency and reliability.