The plastic 'paddle' parts form an arc chute/interrupter.
Remote line fail rf transmitter? Monitor? ???
I can't remember the parts but some are self reseting feeding line downstream, 3 strikes before it trips out. It's to limit outage from branches. I am not sure where all they put them, probably the start of the branch lines.
The fuse inside the cylinder is a cable that looks like a piece of wire rope. It's in a spring loaded housing that when the fuse blows it kicks the blown cylinder out of the holder at the top so it is easy for the utility company to find. They reload the cylinder with a new fuse and reuse them. The fuse when it blows sounds like a loud gunshot.
The fuse inside the cylinder is a cable that looks like a piece of wire rope. It's in a spring loaded housing that when the fuse blows it kicks the blown cylinder out of the holder at the top so it is easy for the utility company to find. They reload the cylinder with a new fuse and reuse them. The fuse when it blows sounds like a loud gunshot.