The SSR heat sink is designed around a pair of SCR's mounted on a heat-spreading metal base to eliminate thermal fatigue failures. To dissipate the heat developed naturally in a solid state relay due to a nominal voltage drop across the device, it must be mounted on a Finned Heat Sink (FHS), or on a metal plate of adequate size. It is advisable to install a solid state relay where the ambient temperature is relatively low because its current-switching rating is decreased as its tempera...


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