1.Supersede the single-phase SSR's cooling effect, dielectric withstanding voltage and current insufficient the disadvantages, and assembly of the inconvenience. 2. Built-in over-temperature protection system, heat sink temperature of 95C or more will be protected, 70C following automatic reversion. 3. Applied load: IR lamp, quartz lamp, heater.4. Small size, high capacity, all in one, best cooling.