Glass fuse are fuses of low current rating. These fuses are widely used in electronics, toys and in domestic appliances. The glass fuse consists of a hollow glass tube with two metal caps. The fuse element is connected between the two end caps. 
The transparent glass body makes the fuse element clearly visible from the outside. This makes it easy for the fuse to be checked.
The downside of the glass fuse is that it has low breaking capacity. It is also sensitive to temperature. Hence, it cannot be used in high temperature applications.