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shorts with 1150 bulb MRH product support
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Active Member 64 posts cp5170 Active Member 64 posts
cp5170

I am using a 5a fuse between my power supply and my Digitrax DB150.  I have installed a 1150 bulb in each block.  In one particular block, I will get a short ( bulb lites) and it immediately blows the fuse.  Digitrax say that the bulb creates a high resistance short as opposed to a hard short which will trigger the DB150 to shut down.

 

Anyone experience a similar problem?  If so, your solution please.

 

Thanks...Ken
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UPWilly Prolific poster 1,965 posts
UPWilly

Bulb Specification

Ken,

You state:

Quote:

"I have installed a 1150 bulb in each block."

The bulb type normally recommended for short protection is a number 1156 - 27 watts at 12.8 volts. At full illumination the bulb draws 2.1 amps (at 12.8 volts) - DCC would be applying slightly more voltage.

I cannot find specifications for a number 1150 bub, but if you are using that, I believe it is a headlamp bulb and not a taillight/parking light bulb; hence the resistance may be significantly less, allowing a full 5 amp short to occur.

(I do not currently use DCC, so there may be others with more experience to answer your question, but my comment here will bump this thread to a higher position on the recent posts.)

Bill D.

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N Scale (1:160), not N Gauge. DC (analog), Stapleton PWM Throttle.

Proto-freelance Southwest U.S. 2nd half 20th Century.

Keep on trackin'
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