What type of fuse has its fusible wire wrapped around an insulator?

The type of fuse that features its fusible wire wrapped around an insulator is indeed a slo-blo type fuse. This design allows for a gradual melting of the wire, which helps prevent nuisance blowing in circuits with transient currents or temporary overloads. The insulator serves to support the wire and maintain proper distance from the surrounding materials, thereby ensuring effective operation.

Slo-blo fuses are particularly useful in applications where motors or inductive loads may cause brief inrush currents that exceed the fuse's rated current temporarily. The wrapped configuration enhances the fuse's ability to handle these brief surges without tripping unnecessarily.

In contrast, other types of fuses such as glass fuses and ceramic fuses typically house the fusible material in a protective casing rather than wrapping it around an insulator. Quick blow fuses are designed to melt and break the circuit almost instantaneously when the rated current is exceeded, but they do not utilize the same insulating and wrapping configuration that defines slo-blo fuses. Understanding these distinctions helps in selecting the appropriate fuse type for various electrical applications.