This automatic Synchronous Firing Power Controller requires 540 ohm input impedance. Its AC voltage ranges between 100 v to 220v. Load current of this product ranges between 5A to 40A. Its mechanism involves activation of its silicon controlled rectifier (scr) when the sine wave surpasses zero and the anode becomes positive. Power control by this system is achieved by keeping its scr off for some cycles and on for remaining cycles. Proportion of these on and off cycles plays significant role in delivering power to the load. Standard of this product has been verified on the basis of its service life, strength, precision level and energy consumption rate.