Power Distribution Component Selection

I have completed the fundamentals and club level wiring courses, and I am about 75% of the way through the professional level course. I am working on a plan to rewire my autocross truck, I don't see where the courses address component selection for power distribution. At least not for my case where I don't plan to run a PDM.

I am attempting to plan and select components for the circuit protection for the direct connections to my battery. At the moment, I need:

- 1/0 primary wire to starter and vehicle general power distribution. I am currently planning a 200 A breaker, but will need another fuse or breaker once I step down to my general power distribution.

- #10 AWG to my ECU. Holley is very clear about requiring direct connection to the battery. I have a 40 A breaker for this connection

- #14 AWG to my TCU. Again, I need a direct connection to my battery. This needs 15 A circuit protection

My battery is rear mounted on the truck frame rail, and I am planning to mount breakers like the ones linked below. The issue is they take up quite a bit of space, and I am wondering if there are better solutions. As it stands, I am looking at three separate breakers at the rear, and at least one more in the engine bay to protect the smaller gauge wire supplying the truck fuse panel.

https://www.amazon.com/Tocas-Surface-Mount-Circuit-Breakers-Waterproof/dp/B07D7VHJYK?th=1

Does anyone have a suggestion for a better alternative to these breakers?

I don't know if it's better, but this is the industry standard for aircraft, which have a lot of vibration like race cars....

In our dedicated race car builds, I have typically used aircraft circuit breakers like these:

https://www.aircraftspruce.com/menus/el/circuitbreakers_klixon.html

These would typically be mounted in the cockpit, but I have mounted them near relay locations on firewalls, etc.

That's a good resource!

I could see using something like that in the cab, but I don't think they would work for the primary protection at the battery. Particularly for cases like mine where the battery is mounted remotely in the rear. I prefer to include circuit protection as close to the battery terminals as possible to limit my potential sources of a short-induced fire.

I will be shopping around on that site, though. They have quite a bit that I can see being useful.

Breakers and fuses are to protect the wiring. I would position the breaker(s) near the ECU or TCU, especially if you have a 10ga wire going to the breaker.

Correct. I am trying to protect the wiring from the battery to the ECU/TCU. So I need a fuse/breaker close to the battery.

Once the breaker trips, there will be no current on either side of the breaker. All wiring is protected.

That is only true for an overload or short circuit downstream of the breaker. A short occurring between the battery and the breaker would not trip the circuit protection.

just info, as a v*lvo truck mechanic, in v*olvo use 70 mm red cable for bbox mounted in rear chassis

topology : battery ---- cut off --- power distribution board

Awesome. Thanks!

70mm^2 is a big cable, but not surprising. I've run that size before on prior installs.

Is the cut off in the rear on those?