1Cooling Function: Adopting advanced cooling technology, effectively reducing the temperature of solid state relay, ensuring long term stable operation. 2For Single Phase SSR: This heat sink is suitable for single phase solid state relays, easy to install and replace, convenient for users to debug and maintain. 3Aluminum Material: The heat sink base is made of excellent aluminum material, with good corrosion resistance, oxidation resistance, has a long service life. 4High Efficiency: With reasonable structural design, this single phase relay heat sink base has good heat dissipation effect, with strong practicality. 5Safe Operation: With strict testing, this relay heat dissipation base has high reliability and good security, making it less prone to malfunctions. 1 x Heat Sink Base