[ToyDB]

Installing a fuse/relay block and circuit breaker.
Anyone aware of a guide to determine what amp circuit breaker to use? (I've searched the web, forums, you tube to no avail.)

Plan on relatively low load accessories such as a couple of lights, front camera, dash cam, etc.

See plenty of folks using 100 amp breakers so that's my inclination but want to double check.

Thanks!

[Dillusion]

Depends on your load from your accessories. Are you making your own relay panel or just looking at one power source for all of the above?

I dont think one relay with lights, camera, dash cam etc is a good idea.

I guess you should decide how much circuits/relays you want. Those should be individually fused. And one big one from the battery feed to all these relays/circuits.

Don't forget to size your wire appropriately.

[ToyDB]

Yes, understand it depends on the load which is why was looking for a guide for breaker amp sizes similar to those for wire and fuse sizes.
Will be installing the breaker along with a fuse and relay block.
Thanks,

[Dillusion]

Not sure how we can guide you without knowing exactly what equipment.

If you following something like the SPOD.

I believe it is 30A per circuit with a 50A main inline fuse.

[gamefreakgc]

You need the circuit breaker to be lower than the max amperage value of the power wire. You also need each accessory to be fused. Here's a simple way to understand it:

Fuses protect the equipment. If say, you dashcam draws a max of 8 amps, a 10 amp fuse will protect it. In case of a malfunction, the fuse blows instead of your dashcam. If you were to install a 5 or 7.5 amp fuse, it'll blow during normal operation though.

Circuit breakers protect the wiring. They are more important than fuses because they protect the wiring from catching fire.. If you have wires with 85 amp capacity, meaning the wire will fail and burn up when it exceeds that capacity, you will want around a 75 amp circuit breaker. That way the breaker trips instead of burning the wire and potentially the entire vehicle.

So to answer the question, you will need to tell use what gauge wire you are using and the max amp load it can handle.

[Dillusion]

Originally Posted by gamefreakgc

they are more important than fuses because they protect the wiring from catching fire..

what?

[gamefreakgc]

Originally Posted by Dillusion

what?

If you exceed the amp load rating of the wire, it overheats to the point of possible combustion. Toyota used fusible links in the engine bay to prevent this from happening. The 100amp fuse for the alternator is a good example. If it ever goes beserk and starts cranking out too much power it trips the fuse and keeps the wiring from melting.

[Dillusion]

Originally Posted by gamefreakgc

If you exceed the amp load rating of the wire, it overheats to the point of possible combustion. Toyota used fusible links in the engine bay to prevent this from happening. The 100amp fuse for the alternator is a good example. If it ever goes beserk and starts cranking out too much power it trips the fuse and keeps the wiring from melting.

And a what do you think a fuse does?

[ElectroBoy]

Originally Posted by gamefreakgc

If you exceed the amp load rating of the wire, it overheats to the point of possible combustion. Toyota used fusible links in the engine bay to prevent this from happening. The 100amp fuse for the alternator is a good example. If it ever goes beserk and starts cranking out too much power it trips the fuse and keeps the wiring from melting.

... and causing a fire.

[gamefreakgc]

Originally Posted by Dillusion

And a what do you think a fuse does?

It blows leaving you stranded in the middle of nowhere. A circuit breaker you just reset.

[ToyDB]

Thank you for the info.

[ToyDB]

Thanks.

[Dillusion]

Originally Posted by gamefreakgc

It blows leaving you stranded in the middle of nowhere. A circuit breaker you just reset.

Thats not what you implied above.

You said circuit breakers are more important than fuses because they prevent fires.

I agree a circuit breaker is easier to reset.

And if you don't carry spare fuses when going into the middle of no where sounds like a personal problem.

[gamefreakgc]

Originally Posted by Dillusion

Thats not what you implied above.

You said circuit breakers are more important than fuses because they prevent fires.

I agree a circuit breaker is easier to reset.

And if you don't carry spare fuses when going into the middle of no where sounds like a personal problem.

Got up on the wrong side of the bed today?

[Dillusion]

Originally Posted by gamefreakgc

Got up on the wrong side of the bed today?

No just preventing misinformation.