These are combination Carling circuit breaker/switch and
Zoro had them on sale for $5 off. They normally cost
about $12 each. Back in the old days (late 1960's ) when I first
used them on the Chaparral 2F they cost $35 each.
Later they got up to over $60 each. These are made in Mexico.

However this will greatly simplify your wiring as no need
for a separate switch and circuit breaker.

This was tricky to lay out. Normally it would be done
on a mill with DRO or an NC mill. The hole placing must
be plus or minus about .020".

I have neither so I made a scale dwg in Rhino
and adjusted the size so it would print on paper full size.
I then  used a center punch to mark all the holes.
Took less than 3 hours.

It will be installed on the new lower RV4 panel.

The one you see here will be gone.

I will also use old fashion steam gage volt and
amp meters on  the lower panel. I am not fond of EFIS's

You can lose all your instruments with one EFIS failure.

Just me.

Paul Lamar


These breakers are in common use on yachts and can be found in serious marine stores.

Capt. Dave in Fort Lauderdale



Gotta have backups and backups for those- I built mine with EFIS, dual GPS, backup vacuum steam gauges, VOR/ILS, and a backup electrical bus. And thanks to LEDs, a total amp draw with everything on of 9.9 amps.

With a 350 CCA 35 AH battery, I can fly for about 3 hours if the alternator quits. And, my tablet will last 12 hours- I am coming home one way or another.

All it takes is planning-


Kevin Alderman
A&P, GROL, ASEL
Comm/Inst


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