High capacity heat sinks are suitable for heating, power control, lighting and motion applications. Designed for use with single, dual and three-phase solid-state relays, the HS Series are rated at 0.25, 0.36, 0.7 and 1.0ºC per watt. The black anodized heat sinks' thermal ratings are based on convection cooling in a typical ambient temperature range of 68 to 140ºF (20 to 60ºC).Crydom_IN