Adequate
heatsinking, including consideration of air temperature and flow, is essential
to the proper operation of a solid state relay. Units should not be mounted in
an enclosed area without proper air flow. Units should also never be mounted to
a plastic base or to a painted surface. Proper thermal transfer gel or pad
should be applied to the heatsink before mounting the relay. Failure to provide
adequate heatsinking will cause a solid state relay to
fail.