Launch Complex 37 has been cleared of all but essential personnel today so the battery systems that fire the pyrotechnic elements on Orion can be verified. Launch systems use special bolts to connect stages and fairings together as a full launch vehicle.
Once in flight though, many of those elements have to separate at different points in a mission, so an electrical charge is used to blow the bolts apart. That allows, for example, spent stages to fall away from the rocket while fully fueled stages take over. In the case of Orion, connectors for the fairing over the spacecraft and its connection with the second stage are also held tight using frangible bolts.