Which of the following is NOT a type of cartridge fuse?

The correct answer is that a screw fuse is not classified as a type of cartridge fuse.

Cartridge fuses are designed to be used in specific holders and are typically cylindrical in shape. They provide a reliable and measurable method of protecting electrical circuits by interrupting the current flow in the event of an overload or short circuit.

In contrast, screw fuses, commonly found in older electrical systems, are equipped with a screw-threaded base that allows them to be directly screwed into a fuse holder or panel. This design is fundamentally different from that of cartridge fuses and is why screw fuses do not fall under the category of cartridge fuses.

The other options, non-time delay and time delay fuses, represent variations within the cartridge fuse category. Non-time delay fuses are designed to blow immediately during overload conditions, while time delay fuses are built to tolerate temporary overloads without blowing, making them suitable for inductive loads that might have momentary surges in current. Understanding these types helps determine the appropriate fuse for specific applications and protects equipment effectively.