Fast fuses classification and their characteristics introduced

Update date:2018-06-26 Source:maxge
  1. Plug-in Case fuse: It is commonly used at the end of the line of 380V and below voltage level, as short-circuit protection of distribution branch or electrical equipment. Screw-type fuses: The upper end of the melt has a fuse indicator. Once the melt is blown, the indicator will pop up. It can be observed through the glass hole in the porcelain cap. It is often used in electrical control equipment of machine tools.

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  2. losed-type fuse    s: Closed-type fuses are divided into two kinds of filler fuses and no-filler fuses, and there are generally used square-shaped ceramic tubes for filler fuses, which contain quartz sand and melt, and have strong breaking capacity and are used for voltage levels below 500V. Current level 1KA or less in the circuit. Non-filled sealed fuses are used to enclose the melt in a closed cylinder with a slightly lower breaking capacity. They are used in power networks below 500V and below 600A or in distribution equipment.



    Fuse Holder

  3. Fast-acting fuses: Fast-acting fuses are mainly used for short-circuit protection of semiconductor rectifying elements or rectifiers. Due to the low overload capability of semiconductor components. It can only withstand large overload currents in a very short period of time, so short-circuit protection is required to have the ability to quickly blow. The structure of the fast fuse is basically the same as that of the packed closed-type fuse, but the material and shape of the melt are different. It is a variable cross-section melt with a V-shaped deep groove punched from a silver sheet           



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  4. Ac contactor: Metallic sodium is used as the melt and has high conductivity at room temperature. When a short-circuit fault occurs in the circuit, the short-circuit current generates a high temperature and the sodium vaporizes rapidly, and the vapor-state sodium exhibits a high-resistance state, thereby limiting the short-circuit current. When the short-circuit current disappears, the temperature drops and the metal sodium restores its original good electrical conductivity. Self-resetting fuses can only limit the short-circuit current and cannot really break the circuit. The advantage is that the melt does not have to be replaced and can be reused


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