[NextNewell]

The auxiliary solenoids are a safety device to prevent connecting the shorepower and the generator together if a relay jams.

Yes, but then the fuse would blow and cut off the power.

Not necessarily, an example would be if the shorepower went down and you switched to generator power. At that point, your generator could be backfeeding the shorepower, a situation you never want to occur.

The Auxiliary Relay in my 1992 is a Square D D9999D01 Transfer Switch Interlock.  http://www.alliedelec.com/square-d-9999d01/70060531/

If a main contactor gets stuck the interlock keeps the manual switch from causing simultaneous engagement on the opposing main contactor. It is not highly likely this will occur, but is worth preventing.

Thanks Jon. My example was based on an assumption, unfortunately an unstated assumption, that the main shorepower contactor stuck closed, such as from an overload welding the points together or the internal contactor springs breaking, but I didn't say that in the post so I really appreciate you clarifying my post.

So, would it be relatively safe to assume that in an emergency situation the interlock switch could be bypassed?