• Mark replied to the topic Wiring Diagram symbols in 737 Classic
    Those are internal relays.

    Two lines, normally open.

    Two line with diagonal, normally closed.

    Abbreviations such as GCR, Generator Control Relay.

    UV, Under Voltage.

    OV, Over Voltage.

    These are depictions to simplify the circuit. There doesn't have to be a physical relay. It could be an actual transistor that's doing the job. They could be logic circuits also.

     
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