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The benefits of utilising a heat sink at a higher temperature. Heatsink sizing is one of the most critical steps when using solid state relays (SSRs). The heatsink provides the necessary thermal dissipation for the power losses in the SSR power unit. This paper gives a detailed thermal analysis of the SSR and heatsink and proposes ways how OEMs can: - Save space in the electrical cabinet - Increase the load current in the SSR - Save on overall system cost.