A bolt-on fuse, also known as a bolted type fuse or a high-speed fuse, is a type of fuse that is designed to protect high-power electrical circuits. It is commonly used in industrial and commercial applications where large amounts of electrical current need to be controlled and protected. Unlike traditional cartridge fuses, which are inserted into a fuse holder, a bolt-on fuse is directly bolted onto a fuse holder or a fuse block. This design allows for a more secure and reliable connection, as the fuse is physically attached to the holder. Bolt-on fuses are typically used in circuits with high fault currents and require fast response times to protect against short circuits or overloads. They are often found in motor control centers, panelboards, and switchgear. These fuses are available in various voltage and current ratings, and they have a higher interrupting rating compared to other types of fuses. This means they can safely interrupt high fault currents without causing damage to the electrical system. Overall, bolt-on fuses provide a reliable and efficient solution for protecting high-power electrical circuits from overcurrent conditions.