Fuses can be classified according to their operating voltage into high-voltage fuses and low-voltage fuses. Based on the protected object, they can be classified into fuses for protecting transformers and general electrical equipment, fuses for protecting voltage transformers, fuses for protecting power capacitors, fuses for protecting semiconductor components, fuses for protecting motors, and fuses for protecting household appliances, etc. Based on their structure, they can be classified into open-type, semi-enclosed-type, tubular-type, and ejector-type fuses.
Open-type fuses have a simple structure; the fusible element is completely exposed to the air and supported by a porcelain column without a base, making them suitable for low-voltage outdoor use. They produce a significant audible and visual noise when breaking current.
Semi-enclosed-type fuses have the fusible element mounted on a porcelain frame and inserted into a porcelain box with metal sockets at both ends, suitable for low-voltage indoor use. The audible and visual noise produced when breaking current is blocked by the porcelain box.
