Fuses In general, there are two types of temperature fuse and current fuse fuse is to play a role in temperature protection, the temperature fuse has high temperature and low temperature protection of the current fuse is from the over flow protection.
Fuses are also known as fuses, and the IEC127 standard defines it as a "fuse-link". It is a kind of electrical components installed in the circuit to ensure the safe operation of the circuit. Fuse The role of the fuse is: when the circuit fails or abnormal, accompanied by rising current, Fuse and the rising current may damage some important devices in the circuit or expensive devices, it is possible to burn the circuit or even cause a fire. If the circuit is properly placed in the fuse, then the fuse will rise in the current to a certain height and a certain time, Fuse their own fuse cut off the current, which play a protective circuit safe operation.
The fuse is an overcurrent protector. Fuses are mainly composed of melt and melt pipe and external filler and other components. When used, the fuse is connected in the protected circuit. Fuse When the current of the protected circuit exceeds the specified value, and after a certain period of time, Fuse the heat generated by the melt itself melts the melt and disconnects the circuit, The
The electrical circuit, the electrical equipment, Fuse and the household electrical appliances are all energized when the overload or short-circuit current passes through the melt, and the melt itself will heat and fuse it. A certain protective effect. With anti-delay characteristics, when the overload current is small, Fuse fuse a long time; overload current, the fuse time is short. Therefore, in a certain overload current range to the current back to normal, the fuse will not blow, you can continue to use. The fuse consists essentially of a melt, a housing, and a support,Fuse where the melt is a key element in controlling the fusing characteristics.
The earliest fuses were invented by Edison a hundred years ago, Fuse because at that time the industrial technology was not developed incandescent lamp is very expensive, so it was originally used to protect the expensive incandescent lamp.
Fuses are made of certain specifications of lead, Fuse tin, antimony, zinc and other metal installed in the electrical circuit on the protection device, it can only allow the normal current through, when the line occurs in the short circuit or overload, due to the thermal effect of current , Fuse The temperature exceeds its melting point, the fuse will be blown, and thus cut off the circuit to ensure the safety of lines and electrical equipment, Fuse to avoid the line due to excessive current caused by a fire accident.
Safe use of the fuse should pay attention to the points
1, can not use too fine fuses, the use of fine fuses, Fuse through the normal current is also easy to blow, resulting in unnecessary accidents;
2, must be selected and meet the needs of the fuse, Fuse the fuse fuse current is usually 1.5 to 2.0 times the rated current. If the sum of the total power of the appliances in the household is more than 1100W, the fuse of 5 amps shall be selected, that is, the fuse with a diameter of 0.98 mm. Fuse When the current exceeds 7.5 amperes to 10 amps, the fuse will automatically Fuses to achieve the purpose of protection;
3, if the choice and use of fuses meet the specifications but often fuse fuse phenomenon, indicating that electrical wiring and electrical equipment problems, should promptly ask the electrician to find the cause, Fuse remove the hidden dangers. Must not be free to replace the thick fuse and simply with copper wire, wire and so on instead.