There is a removable cartridge that stops the blade. It ruins the blade. The cartridge gets swapped out with a new one in a few minutes (the table top of the saw can be partially opened) and costs about $150 .

It _may_ destroy the blade. I've had mine for about 10 years, and have had two false triggers in that time (both times, dumb mistakes on my part). Neither time has the blade been destroyed.

One of them did require a resharpen though.

It's sacrificial ... So that your finger is not.

AFAIK all sawstop catridges are one time use only and also destroys the disk. This is not really a bug.

IIRC you need to replace the brake cartridge and the blade.