FAQ02106 of Solid-state Relays FAQ

Although when the maximum current flows in the rated range, the temperature of the SSR reaches around 80 to 100 degrees, it is not abnormal.

However, pay careful attention to the heat loss. In general, when the ambient temperature is high, the value of switchable load currents decreases.

Switching elements in the SSR such as TRIAC, Thyristor and power transistor produce heat by having residual voltage (voltage lost inside a semiconductor when it turns ON).