I purchased this item to use the low voltage control to turn my oil free air compressor on and off. It's easy to install. My air compressor draws about 16 amps at 120VAC single phase. So far this solid state relay is working as expected. It says a cooler is needed. My air compressor only runs for a minute or two at a time, so I haven't noticed any noticeable heat output from this unit. I used a heatsink on the back and just installed it in a 4" square plain back switch box. that seems to give him some warmth. I used a spare 4.5vdc cell phone charger with the end disconnected as the dc source for the control voltage. Seems to be working fine.