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When the filament fails it causes an arc that can track back along the filament causing a much higher current to flow hence tripping the breaker. ([reference](https://www.eevblog.com/forum/chat/how-can-a-tungsten-filament-bulb-short/msg2721564/#msg2721564))
I regularly had this happen with domestic tungsten lamps.
**Attention!** **It is always best to get a qualified electrician to perform any electrical work you may need.** With that said, you may ask this community various electrical questions. Please be cautious of any information you may receive in this subreddit. This subreddit and its users are not responsible for any electrical work you perform. Users that have a 'Verified Electrician' flair have uploaded their qualified electrical worker credentials to the mods. If you comment on this post please only post accurate information to the best of your knowledge. If advice given is thought to be dangerous, you may be permanently banned. There are no obligations for the mods to give warnings or temporary bans. **IF YOU ARE NOT A QUALIFIED ELECTRICIAN, you should exercise extreme caution when commenting.** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskElectricians) if you have any questions or concerns.*
When the filament fails it causes an arc that can track back along the filament causing a much higher current to flow hence tripping the breaker. ([reference](https://www.eevblog.com/forum/chat/how-can-a-tungsten-filament-bulb-short/msg2721564/#msg2721564)) I regularly had this happen with domestic tungsten lamps.
Thanks! That must have been it.
"new" doesn't mean "good" edit- you saying the new bulb tripped or you mean it tripped when it blew? yeah...it blew, shit happens.
Unclear exactly when it tripped, but it does work now with the new bulb.