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Fuse principle

Hits: Date:2016-06-07 14:23:39

    Basic introduction

    brief introduction

    Fuse is based on the current value over a period of time, with its own heat produced by melting the melt, so that the circuit is disconnected; the use of this principle made a kind of current protection device. Fuse is widely used in high and low voltage power distribution systems and control systems and electrical equipment, as a short circuit and over current protection, is one of the most widely used protective devices.

    Fuse is an over current protector. The fuse is mainly composed of the melt and the melting pipe, as well as the filler and other parts. When in use, the fuse in series in the circuit to be protected, when the protected circuit current exceeds the specified value, and after a certain time, produced by melt heat fusing, the circuit disconnected, so as to protect the role. Electrical fuse with metal conductor as a melt and broken circuit of series in the circuit, when the overload or short circuit current through the melt, melt heating and fusing, and to the power system, all kinds of electrical equipment and household electrical appliances plays a protective role. With anti time delay characteristic, when the overload current is over, the fusing time is long; the overload current is large, the fuse time is short. Therefore, in a certain range of overload current to the current return to normal, the fuse will not fuse, you can continue to use. The fuse is mainly composed of 3 parts, including the melt, the outer shell and the supporting seat, and the melt is the key element to control the fusing characteristics.

    In the import and export tariff, classified into 8535 or 8536.

    working principle

The metal conductor is used as the melt in series in the circuit, when the overload or short circuit current passes through the fuse, the fuse is blown out, thereby breaking the circuit. The fuse has the advantages of simple structure and convenient use, and is widely used in the electric power system, all kinds of electrical equipment and household appliances.

    characteristic

    Melt rated current is not equal to the rated current of the fuse, and the rated current of the fuse should be selected according to the load current of the protected equipment.

    The fuse is mainly composed of 3 parts, including the melt, the outer shell and the supporting seat, and the melt is the key element to control the fusing characteristics. The material, size and shape of the melt determine the fusing characteristics. Melt materials are divided into two types, which are low melting point and high melting point. Low melting point materials such as lead and lead alloy, the melting point of low to fuse, due to the resistivity is bigger, so made the melt section size larger, melting metal vapor more applies only to low off the ability to fuse. High melting point materials such as copper, silver, high melting point, not easy to fuse, but due to the low resistance can be made than the section size of the low melting point melt smaller and less metal vapor generated when the fuse for in high breaking capacity fuses. The shape of the melt is divided into two types, which are filamentous and ribbon. Changing the shape of the variable cross section can significantly change the     fusing characteristics of the fuse.

   Fuse has the anti time delay characteristic, namely the overload current hour, the fuse time is long; the overload current is big, the fuse time is short. Therefore, in a certain overload current range, when the current return to normal, the fuse will not fuse, can continue to use. Fuse has a variety of fusing characteristic curve, it can be applied to different types of protection of the needs of the object.

     effect

     Electrical components installed in the circuit to ensure the safe operation of the circuit.

When the circuit is faulty or abnormal, with the rising of the current, and the current is likely to damage the circuit in some of the important devices or valuable devices, it may also cause the burning of the circuit. If the circuit correctly placed fuse, then fuse will be in current abnormally elevated to a certain height and, its fuse to cut off the current, thus the safe operation of the protection circuit. Cut off current, so as to protect the safe operation of the circuit.

     In order to prevent the occur leapfrog fuse, the expansion of the scope of the accident, on the lower level, i.e., the power supply trunk and branch) line fuse room should have good cooperation. Selection of the superior (mains) fuse melt rated current ratio (power line), Junior 1 ~ 2 differential. Commonly used fuse tube fuse R1 series, spiral type fuse RLl series, packing seal type fuse RT0 series and fast fuse RSO, RS3 series, etc..


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