Also the only time I have seen fire bottles actually blown in an aircraft (S-76) It did open the C/B's?
I've also seen this on an S-76.
The fire bottle squibs on a 76 are fairly hefty devices, and unlike some squibs which when fired, simply use the pressure formed from the explosion, these ones fire a heavy lump of metal which pierces a diaphragm, and they take quite a high amperage to operate.
(The last time I worked on one of these was quite a few years ago, so it's possible that it's been changed since then).
One of my duties was disposing of timex squibs by firing them, (in a specially designed cabinet),and I noticed that the S76 squibs often took far more current than other types, and I ocassionally had some that failed to fire. These duff squibs sometimes blew the CB on the discharge rig.