1Quick in Cooling: The heat sink comes with multi layer design, which has larger contact area with the air, thus largely promoting heat dissipation. 2Stable Operation: Through quick cooling, the high temperature of solid state relay can be easily reduced to better maintain the stable operation. 3Premium Aluminum: Adopting premium aluminum material, the single phase SSR heatsink is not likely to break, and has great durability for long use. 4Good Workmanship: Having been through excellent workmanship, the single phase solid state relay heat sink ensures perfect fitting, very reliable. 5Easy Installation: Designed to have a compact size and a light weight as well, the heat sink accessory is very convenient to install within minutes. 1 xSolid State Relay Heat Sink