CF125 Circuit Breakers, DC rated for 125 volts.
They are UL Listed for up to 48 volt systems, but they can be used for 12 or 24 VDC nominal systems as well as AC systems.
They have lugs at both ends which accept up to 1/0 cable.
They can be mounted in one of two ways. You can attach them using # 6-32 mounting screws to the face of the breaker.
They can also be placed on a vertical flat surface with mounting screws
or bolts going through the "U" shaped tabs on the top and bottom