[Spridgets] circuit breaker

[David Woerpel]

If my old memory recalls correctly out British fuses are rated differently
from U.S. fuses.  British fuses are rated at 35A. That's the blow rating.
They will carry ~17A I believe.  U.S. fuses are rated by the current they
will carry.  I recall something about "slow" blow vs ""fast" blow but don't
remember how that fits the equation.   Can someone verify the horn fuses is
50A?  That's what I have and the 2nd fuses is 35A. Both are Lucas.  Hey,
it's what we did before relays came along.

Dave W
59 :()
59 MGA 1500

"Pay It Forward"



On Wed, Apr 16, 2025, 5:02 PM Rick Fisk via Spridgets <
spridgets at autox.team.net> wrote:

> Jack,
>
> I was doing some simple adding in my head when I came up with the 30A
> number.  The unfused standard headlamps are about 4-5 amps each, the
> parking lamps are probably another 2-3 amps.  I know from personal
> experience that you can safely replace the British 35A fuses with American
> 15A fuses and they don't blow.
>
> Maybe a better way to go would be to fuse the unfused circuits.
>
> Rick
>
>
>
> On Apr 16, 2025, at 5:13 PM, Orkin, Jack L via Spridgets <
> spridgets at autox.team.net> wrote:
>
> 
>
> [image: Attachment thumbnail]
> Paul, I was thinking about the same thing.  I bought a large circuit
> breaker a while ago but never did anything with it because I didn't know
> where to put it or if it was even needed with all the existing fuses.  I
> wonder where a high amperage short could happen that would not be handled
> by the fuses?  Between the alternator and battery?  Or, battery and fuse
> block?   I've only seen something like this on one LBC so I guess not too
> many people are concerned about it!  Breaker shown is a 100 A, Napa/Buss
> 782-3114
>
> After seeing Rick's post, maybe 100A is overkill?
>
> Jack
> ------------------------------
> *From:* Spridgets <spridgets-bounces at autox.team.net> on behalf of Paul
> Van Wig via Spridgets <spridgets at autox.team.net>
> *Sent:* Wednesday, April 16, 2025 1:55 PM
> *To:* Spridgets <spridgets at autox.team.net>
> *Subject:* [External] [Spridgets] Fusible Link
>
> I’m thinking about an overall fuse or circuit breaker to protect the
> wiring harness. But the question is how many amps?
>
>
> Paul Van Wig
> Big Bear/Lakewood, CA
>
> 
>
>
> *1959 Nash Metropolitan "Tiffany" (the wife's fun ride) w/63MGB motor*
> *1960 Bug Eye “Frogari” 1310cc,Kent 286 cam, Webber 45, Datsun 5 speed,4
> wheel disc brakes*
> *1968 Morris Minor Woody RHD "Thomas"*
>
>
>
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