Using this switch is straightforward. First, make sure the power is off to avoid any electrical hazards. Then, align the switch with the cut - out size of 33mm X 22mm on your device and fit it in. Connect the 6.4mm spade terminals to the appropriate wires. When the power is on, the red illumination will indicate the switch's status. As for maintenance, keep the rubber splash cover clean to prevent dirt and moisture from getting inside. Check the connections regularly to ensure they are tight. If you notice any issues, such as loose connections or problems with the illumination, turn off the power and contact us for further assistance. Remember, this switch is rated at 250VAC, 20Amp, so don't use it for applications that exceed these ratings.