Re: 1156 Bulb Short Protection and Powercab



It's a function of prior-current, I suspect - if the bulb was already seeing significant current(i.e. a couple of locos running at speed), then the filament is already warming, so when the short occurs, it takes less time to light up, and hence acts before the powercab; if the filament was cold (i.e. a single low-current loco crawling into a turnout that is in the wrong position), then the booster sees the short before the filament warms.  That's what I think is going on.

I suppose a chart showing which boosters/systems will benefit from bulb-style protection, and which won't, might be useful, but how many people are still deploying bulb protection?


On 2021-06-16 15:43, Dave Hamernik wrote:
Well I guess wiring up my 1156 bulbs was a bit of an exercise in futility since the powercab responds more quickly. However, the bulbs sometimes do respond first so at the end of the day, they offer an extra level of protection. Not sure why they sometimes light before the powercab but…

Thanks for your response. 

Join to automatically receive all group messages.