Add-A-Circuit These are GREAT! It makes tapping into your fuse box to supply power to your plow controller or plow lights a breeze. Remove the fuse you want to take power from, insert it in the holder, put the holder in place of the original fuse, put the fuse in you need to protect your accessory in the additional space, connect the power wire from your accessory, and you are done. Accessory port has a LIMIT OF 10 AMPS. These are for ATR Micro 2 Fuses ONLY. Scroll through ALL images for comparison to ATM Mini fuses. The Micro 2 ATR is even smaller. How to install.