I would say a fuse or line protector.
I know some of the old equipment manuals
that we had at work (hydroelectric since the teens) had information on fusing. Pretty much the fuses ratings were "For XXX amps at 6900 volts wrap a single strand of (standard small Gauge)copper wire so many times around the insulated fuse body being sure to not overlap the windings".
The item you have was probably a correctly sized spring wire soldered to a solid thin copper foil bottom that clamped into a holder of some kind. It was probably a vacuum inside and sealed. The vacuum helped quench the arc. Being clear glass you could see when it was blown.
Most breaker contacts are much more robust than the thin wire spring inside this.
Just my guess.