This is a 1 AMP Line/Fan replacement fuse for Rainbowair Ozone Generator Models 5200, 5210 and 5401. The fuse is located on the left side of the Ozone Generator as you are looking from the back of the unit. This fuse powers the fan.
This fuse is also used as the High Voltage/Ozone fuse for Rainbowair Model 5600. This fuse is located on the right side of the Ozone Generator as you are looking from the back side of this unit.