You don't need a line conditioner. Its meant for more delicate equipment (ie: audio & medical mainly, computer, video, etc.) They are used to clean up the AC power, long with absorbing the surges and sags. (sags are worse the surges)
On another note (different poster)
And new fuses? Like old fuse are worn out and weak? LOL. Breakers get weak after too many trips. Also breakers trip via magnetic and/or thermal overloads.