Unique Heat Spreader Technlogy Product Available With Heat Sink Solid State Circuit, No Wear and tear Optically Isolted Circuit Available in 124 Channels Compact in Size Compared to Contactors LED indication for easy diagnostics Operating Temperature -20 to 80 C Model For 110 V AC Load available Longer Life Roughly 10 to the power 8 Operates even in area of High Vibration & Noise