By EECTECH | 07 April 2020 | 0 Comments
Components of fuses
Components of fuses
①According to the protection form, it can be divided into over-current protection and over-heat protection. The fuse used for overcurrent protection is the fuse that is usually said (also called current-limiting fuse). Fuses used for overheating protection are generally called "temperature fuses". Temperature fuse is divided into low melting point alloy type and temperature sensitive trigger type, as well as memory alloy type, etc. (The temperature fuse is to protect the heating appliance or easy heating appliance temperature is too high for protection, for example, hair dryer, electric Irons, rice cookers, electric stoves, transformers, motors, etc.; it responds to the rise in temperature of electrical appliances and does not care about the working current of the circuit. Its working principle is different from "current-limiting fuse").
②According to the scope of use, it can be divided into power fuses, machine tool fuses, electrical instrument fuses (electronic fuses) and automobile fuses.
③According to the volume, it can be divided into large, medium, small and micro.
④According to the rated voltage, it can be divided into high voltage fuse, low voltage fuse and safety voltage fuse.
⑤According to the breaking capacity, it can be divided into high and low breaking capacity fuses.
⑥According to the shape, it can be divided into flat-head tubular fuse (also can be divided into internal welding fuse and external welding fuse), pointed-tip tubular fuse, guillotine fuse, spiral fuse, insert type fuse, flat type Fuses, wrapped fuses and patch fuses.
⑦According to the fusing speed, it can be divided into extra slow fuse (generally expressed by TT), slow fuse (generally expressed by T), medium speed fuse (generally expressed by M), fast fuse (generally expressed by F) And special fast fuse (generally expressed by FF).
⑧ According to the standard, it can be divided into European standard fuse, American standard fuse and Japanese standard fuse.
5. Briefly describe the structure and characteristics of the spiral fuse RL. The spiral fuse RL is equipped with quartz sand in the fuse tube, and the melt is buried in it. When the melt is melted, the arc is sprayed onto the quartz sand and its gap, which can quickly cool down. And extinguished. In order to facilitate monitoring, a color point is installed at one end of the fuse. Different colors indicate different melt currents. When the melt is melted, the color point jumps out, indicating that the melt has melted. Spiral fuse rated current is 5 ~ 200A, mainly used for branch circuits with large short-circuit current or places with flammable gas.
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