The Caloritech™ HE-54 Heat Sink provides support when an SSR has a small voltage drop while conducting. The resulting heat generated must be dissipated by means of a heat sink. Many styles and ratings are available. Current rating for SSR's must be derated depending on ambient temperature and type of heat sink. The HE-54 can handle a single relay up to 50 Amps. Check with factory for design assistance.