fuse to breaker

[madpilot]

I am converting my fuses to breakers. I am wondering who sells the buss bar and breaker holder for about 8 breakers. I am looking for the type that mounts under the panel. The wires still looks good but I will probably have my AP rewire them in the future.

[blueldr]

I think you'll find that the parts you're looking for are generally owner produced to fit the installation. I don't believe there is an STC covering this project so you may have to try to get it approved on a "337 one time".
In view of the present situation with the FAA and field approvals,I strongly suggest that you attempt to get it pre approved before "cutting any metal".

[MeeksDigital]

Among many other things, I just had my avionics guy install a new sub-panel with breakers and avionics master switches, in place of the old fuse panel. the plane is almost out of the shop, I'll be happy to send you some photos of the installation when I get it back.

A 337 "field approval" must be obtained - as far as i know there is no STC for breakers. overall it's been fairly simple to get the whole shebang approved.

[cessna170bdriver]

I did mine with a logbook entry as part of my alternator conversion. For a breaker holder, I used a piece of 0.063 2024 sheet aluminum angle wide enough to accomodate the breakers (1.5" as I remember). This part replaced the original fuse holder. I used the trip-free Potter-Brumfield toggle switch breakers. "Trip free" means that the breaker will interrupt an overload even if the switch is held in the ON position. For bus bar, I did the calcs and found that a piece of 1/2" copper tubing flattened in a vice easily handles the load.

I made a second breaker bus for an avionics bus. This bus is wired back to the original Radio Master switch, which is in turn supplied by its own breaker on the main bus. I used push-to-reset push button breakers on this one.

This setup has been trouble free for the last 17 years and 1300+ hours.

Miles

[phantomphixer]

You can always jumper from one breaker to the another with pigtail jumpers using correct size wire and lugs. Worked for Douglas Flight Test for 20 years and that's the way circuit breakers were connected. They used a little more elaborate means of making the connections, but that's the basics. That's what my logbook entry has although breakers are listed on the restoration 337

[FredM]

the quickest and easiest method i've seen is to use a bonding strap. you simply cut it to length with scissors poke a hole in it with an awl where you want the screws to go. takes only a few minutes. works great.