Fuses can be divided into high-voltage fusesand low-voltage fuses according to the working voltage of the application. According to the maintenance objectives, it can be divided into maintenance transformers and general electrical equipment, transformers, low-voltage capacitors, semiconductor material components, motors and electrical products. According to the structure, it can be divided into open type, semi-closed type, tube type and spray type fuse.
The open-type fuse has a simple structure, the melt is completely exposed to the air, and is supported by a ceramic column without support, which is suitable for low-voltage outdoor applications. More photocontrol occurs in air.
The fuse of the semi-enclosed fuse is installed on a porcelain shelf and inserted into a porcelain with metal power sockets on both sides, which is suitable for low-voltage room applications. When the current is disconnected, the light control is blocked by the porcelain box.
The fuse of the tubular fuse is installed in the fuse. It is then inserted into the support frame or immediately connected to the power circuit. A fuse is an insulating tube that is completely sealed on both sides with a metal cap or a touch knife. If the insulating tube of the fuse is filled with quartz sand, the current is relatively limited, which can further improve the cutting ability, so it is also called a high cutting ability fuse. If the tube is vacuum packed, it is called a vacuum pump fuse. If the tube is filled with SF6 gas, it is called SF6 fuse, which is dedicated to improving the magnetic blowing characteristics. Because quartz sand, vacuum pump and SF6 gas have good flame retardant properties, this fuse is not only suitable for low voltage, but also for high voltage.
The spray fuse is to install the melt in an insulating tube made of solid gas raw material. The solid gas raw material can be made of electric welder’s anti-white cardboard or organic glass plate raw material. When the short-circuit fault current depends on the melt, the melt immediately melts and causes electrical isolation. The high-temperature electric arc dissolves the solid gas raw materials quickly, resulting in a lot of high-pressure gas, and then the hydrolyzed gas is sprayed out on both sides of the pipeline, and a great light control is transmitted. When the communication current crosses zero, the electric arc is extinguished and the current is interrupted. . The insulating tube is usually mounted on the insulating support frame, producing all the fuses. Sometimes the top of the insulating tube can be moved, and it will fall off immediately after breaking the current. This type of blow-out fuse is often referred to as a drop-out fuse. Generally, it is suitable for outdoor places where the working voltage is higher than 6kV.
In addition, according to the breaking current category, fuses can also be divided into general-purpose fuses, reserve fuses and all-round fuses. Generally, the breaking current range of the fuse is from the range of the load current exceeding 1.6~2 times of the rated current to the larger breaking current. This fuse is suitable for maintenance of distribution transformers and general electrical equipment. The breaking current range of the reserve fuse refers to the range from the load current exceeding 4 to 7 times the rated current to the larger breaking current. The fuse is usually applied in series with the AC contactor. When the load current is lower than 4~7 times of the rated current, the AC contactor completes the breaking maintenance. Suitable for maintenance of electric motors.
With the necessity of industrial development, unique fuses suitable for various regulations are produced, such as electronic device fuses, thermal fuses and resettable fuses.
Post time: Mar-03-2022