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I found a picture of how this one works. I think it is a DC relay. One coil pulls the magnet over center one way and the other coil culls it back.
I have some AC relays. Two separate coils. The arm is spring loaded "over the top" latch.
Sorry for the bad drawing. The arm hold to the left or right but does not stay in the middle.
I drew two coils (left and right) they are elector-magnets. That pull the arm over, past center.
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