relays are electrically controlled devices that open or close electrical contacts to effect the operation of other devices in the same or another electrical circuit.
and if you see those metal bits there -- those are huge magnets that bend electrically charged particles, so it can measure how fast they're traveling.
(vi) for electrically initiated explosive trains, the design shall include means to dissipate the electrical energy within the required operational lifetime;
the ssa is electrically connected and mechanically held secure in the 242-contact slot connector
(consider a ssa with a retention mechanism interface) and
"battery means two or more cells which are electrically connected together and fitted with devices necessary for use, for example, case, terminals, marking and protective devices.