Product description: the new type of bidirectional high-power thyristor is used, and the limit current can reach 100 amperes, which perfectly solves the over-current problem caused by too little resistance of the furnace wire under cooling condition. It can easily adjust the output voltage of the power supply. For example: electric furnace, water heater of adjust heat, lamps and lanterns of adjust light, small motor speed regulation, electric iron adjust temperature. So as to achieve dimming, temperature, pressure control effect. Large appliances with power of less than 10, 000 watts of power are used.