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 .
> When the brake is activated, the most recent data is stored into memory and SawStop can download the data from the activated cartridge. This data is very important to our continuing research and development program. If SawStop’s engineers verify the activation was due to contact with skin, you will receive a free replacement cartridge. If you are unsure why the cartridge activated, you can also ship the cartridge for analysis to SawStop’s service engineers. When the cartridge data is downloaded, we then can determine what specifically caused the brake to activate so that further unintended activations can be prevented. The brake cartridge evaluation is free of charge the shipping of the brake cartridge is paid for by the customer.
> When the brake is activated, the most recent data is stored into memory and SawStop can download the data from the activated cartridge. This data is very important to our continuing research and development program. If SawStop’s engineers verify the activation was due to contact with skin, you will receive a free replacement cartridge. If you are unsure why the cartridge activated, you can also ship the cartridge for analysis to SawStop’s service engineers. When the cartridge data is downloaded, we then can determine what specifically caused the brake to activate so that further unintended activations can be prevented. The brake cartridge evaluation is free of charge the shipping of the brake cartridge is paid for by the customer.
https://www.sawstop.com/service-tips/what-to-do-if-the-sawst...