--- In [email protected], Christopher Borgmeyer <cborgmeyer@...> wrote:
>
> One of the major advantages of the bulb over the circuit breaker is that the
> bulb will allow other locomotives in the same power district to continue to
> operate during the short.
>
> Chris Borgmeyer
>
> Re: DC Power supply (use automotive bulbs as fuses)
> Posted by: "dhultay" HULTAY@... dhultay
> Tue Nov 29, 2011 10:48 am (PST)
>
>
> However, they will burn-out when a larger amount is drawn from power supply
> (i.e. sustained dead short) preventing melted plastic trucks with derailments.
> It can get costly to replace automotive bulbs if you have alot of derailments
> /dead shorts.
> Advantage over $30 electronic circuit breakers for each power district is
> they tolerate transient shorts better, allowing trains (and other power
> districts) to continue to operate when only minor rough spots are encountered.
>
>
> Dennis H.
> Soon to be in Saratoga NY
_____________________________________________________
They shouldn't burn out. The "dead short" is no different than wiring the bulb
across the posts with nothing else in the circuit. The bulb is going to draw
only so much amperage, which is what makes it such a good protector. Now, if
the voltage exceeds the bulb rating, that is a different story.
I use a 12V automotive bulb in the circuit of the yard throttle for Terminal
District, because the AF circuit breaker is so temperamental. I run this
throttle on the variable voltage post of the AF transformer set at about half
throttle, which prevents excess (15V AC) from reaching the bulb if a short
occurs. I've even had the bulb glow from mysterious overloads, but it has never
burned out from a short, even when I created one as a test.
However, such simple "dated" and inexpensive technology has no place in our
modern world where over developed, over rated, and (especially) over priced
circuit limiters can do the same thing for much more money.
Bob Nicholson _______________________________________________
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