Larry can you remove the breaker and open it up?
A lot of larger breakers can be opened up and closed back up with out effecting the calibration.
If you can get the lid off I bet you could figure out what you have for connections.
I have never seen a 4 wire set up, usually two black wires, one goes to neutral and the other is powered to trip the breaker.
Most systems work best if they are kept simple rather than made complicated; therefore simplicity should be a key goal in design and unnecessary complexity should be avoided.