Today's Message Index:
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1. 02:02 AM - Breakers or fuses, the perennial question (Peter Pengilly)
2. 08:27 AM - Re: Breakers or fuses, the perennial question (user9253)
Message 1
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| Subject: | Breakers or fuses, the perennial question |
Bob,
Its good to hear from you again!
I have been pondering the breakers or fuses question in my last couple of p
anel builds. I had several breakers already installed so didn't object to k
eeping them. The last panel had a load of Garmin stuff. In particular a GDU
460 screen. This screen needs some button pushing at power up to get it in
to "Configuration" mode, which is used $a lot$ during the early panel set-u
p stages and also occasionally thereafter. A breaker is more useful on this
power supply to be able to get the unit into config mode easily.
Some of the other devices also did not need to be (and I did not want them
to be) powered up during maintenance activities and do not have an off swit
ch. Therefore, a breaker seemed more suitable for these devices. There are
also things like a stall warner that I hate (AoA is much better) but I must
have due to local regulations, so that is on a breaker.
I have taken the view that I want to use as many fuses as possible and deci
ded that,
*
Everything gets a fuse unless there is a good reason otherwise
*
Anything with an off switch on the unit or in the panel (eg lights) definit
ely gets a fuse
*
Anything that I really don't want powered up during maintenance on other sy
stems gets a breaker
*
Anything that needs powered applied in a controlled manner (eg GDU 460) get
s a breaker
*
Anything that I don't want on very often gets a breaker
I didn't apply these rules strictly enough during the last build and ended
up with too many breakers that were expensive and a pain to install. I also
used some ETA non pullable breakers (for items with off switches) that wer
e small and inexpensive, but more expensive than fuses. I have found it dif
ficult to avoid installing several breakers.
Peter
Message 2
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| Subject: | Re: Breakers or fuses, the perennial question |
I suggest that you use fuses for everything.
Then use miniature toggle switches for those items that you want to shut off.
https://www.mouser.com/datasheet/3/339/1/MN_ToggleSections_DP.pdf
In my plane, I mounted all switches on a rectangular piece of aluminum with a nutplate
at each end.
Then mounted that aluminum behind the instrument panel with two screws.
If necessary to service a switch, remove the two screws and all switches are removed
at once.
Of course the wires are longer to form a service loop.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=517212#517212
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