Hey Adam,
I don’t know much about the Elite / Masso controller, but between the power supply and an axis stepper motor (rotary axis included), there is not simply a fuse and a cable, but a stepper driver. It mainly consists of a driver chip that is controlled by the CNC controller, and a MOSFET driver. To dimensionate your stepper motor, you need the electrical specifiations of this stepper driver, otherwise you might overload it.