Tesla, that describes a current shunt.
Where I am familiar with reverse power relays is when you have multiple paralelled generators or a generator tied to the grid. If the prime mover slows down, the slower generator turns into a motor and consumes power instead of producing power. This motoring action can then damage the prime mover.
Looking at the tech sheets, there are connections to current transformers and potential transformers, but how do you determine the direction of power flow?
Larry
