side view of item found on RR in Preble Co. Ohio (answer From The Grumpy Old Man) That there is a fuse cut out for power. The "hook" went over the X-arm, with a nail set through the small hole to keep it from wandering and wiring came in through the side holes to connect to the hubs. A fuse was placed across the hubs. The unshown open side was the access door for linemen to get in a service a blown fuse.

el Elektro