The solid cap on the single vent fuse holder is a copper alloy, silver-plated to provide efficient current transfer.An integral ring is provided in the top tube casting for opening and closing the fuse holder with conventional disconnect tools from the ground, from a bucket truck or from the pole.The toggle type trunnion casting is a selective silver-plated bronze for efficient current transfer to the lower hinge contacts.A cam shaped projection on each side of the trunnion casting provides high pressure parallel current paths to the lower contacts.
These projections, or pivot pins, are cast full round for smooth rotational operation in the hinge.The link ejector assists in arc interruption during low fault current or excessive overload conditions.A groove in the center minimizes bending stresses in the pigtail to prevent broken strands.A stainless-steel torsion spring on the link ejector helps to rapidly eject the link from the bore of the fuse holder during interruption.
The 200-ampere link ejector has a wider groove area and increased spring force to accommodate the larger links.