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How do the D65 monitoring relays work?

When voltage is applied to a D65 monitoring relay the relay contacts will activate/change state. When the relays trips, the contacts will change state again, meaning they will go back to the state that the relay would be in with no voltage applied.  What causes the relay trip depends on which version of the D65 you have.  See volume 5 tab 5 for more details. Link below.

http://www.eaton.com/Eaton/ProductsServices/Electrical/Support/Documentation/Catalogs/Volume5/index.htm