Devantech multichannel relay module boards devantech usb rly16l the usb rly16l is a low power version of the usb rly16 relay module board 60 5062 the module board containing 8x relays is powered and controlled entirely via standard usb bus and the 8x volt free contact relay outputs have a current rating of up to 16a each the relays are of the single pole changeover spco type and unlike the other relay module boards in the series are latching types meaning that the relays will reta