[Arnfinn Madsen]

There is quite a few electronic devices that is constructed so that they will stop to function under certain circumstance (even some are made to do so if they experience a power cut). It is sometimes done to avoid people to getting access to the technology or the configuration inside and sometimes for completely different reasons. It is not a dramatic explosion though (although in some cases an intentional overheat may be involved), just a lot of processes intended to destroy it. If you want top-tier security you also want to avoid people to figure out how your top-tier security works, so this is an integrated part.