Adaptor with fail safe mechanism. The FDA
is equipped with an integrated fail-safe mechanism which ensures that a burnout in one loudspeaker does not lead to a failure in the entire system of connected speakers. The FDA
is equipped with a ceramic terminal, a thermal fuse and a heat-resistant high-temperature wiring (10 cm) so that it conforms to both Dutch (NEN 2575) and British (BS 5839) regulations for alarm systems.