Maker's Name: 
Where made: 
6.1 × 2.3 × 4.8 cm

This ceramic unit was mounted on switchboards in homes. It contains two brass wipers which slide into sprung clips. A piece of plated Copper wire of suitable diameter is held by screws between the wipers. This fuse wire is in series with an AC mains sub-circuit in the house. 

The wire melts and/or evaporates when the current exceeds the rating of the wire, and breaks the circuit. A fresh piece of wire is then cut to length and replaces the blown fuse, after determining the reason for the fuse blowing.