Those are symbols for power contactors (which are "big" relays used for power distribution).
You see identifiers like GCR (Generator Control Relay) or DPR (Differential Protection Relay).
The double lines without the diagonal represent an "open" contacts.
The ones with the diagonal indicate "closed" contacts.
This doesn't mean the contactor is energized or not. This is just a representation of different conditions for power distribution (APU feeding bus, generator feeding bus, external power....).
I don't normally see prints with these symbols. Is this from the troubleshooting manual or maybe a manufacture's systems guide?
