When the fuse is connected in series in the circuit to be protected. When the circuit short circuit or severe overload, the fuse fuse will fuse automatically, play a protective role, the most common is the fuse. In addition, circuit breakers, commonly known as "air switch", is also a kind of short circuit protection, when the flow, it will automatically trip, play a protective role; fuse, circuit breakers are protective equipment. But they are not the same. Circuit breakers are generic and can be divided into two types: frame type circuit breakers and plastic case circuit breakers. Frame type circuit breakers, commonly known as universal circuit breakers; plastic shell type circuit breakers, commonly known as the beginning of the air. They have short circuit and overload protection, which can be reused. Life is generally in the thousands of times to tens of thousands of times. A fuse is a kind of electrical equipment which is used to fuse the protective circuit by the melt. After the need to replace the melt.

    The difference between fuse and circuit breaker:

    They are identical to the functions of short circuit protection and fuse the principle is the current flowing through a conductor to conductor heating, achieve the conductor after the melting point melting conductor broken off protective circuit with electric appliances and circuit from being burnt. It is an accumulation of heat, so it can also achieve overload protection. Melt is to be replaced once the melt is burned.

    Circuit breaker can achieve short circuit and overload protection, but not the same principle, it is through the bottom of the current magnetic effect (electromagnetic tripping device) to achieve circuit protection, through the thermal effect of the current overload protection (not fuse, many do not replace the device). Specific to the actual, when the circuit of the power load for a long time close to the load of the fuse, the fuse will gradually heating until the fuse. As mentioned above, the fusing of the fuse is the result of the current and the time together to play the role of the protection of the line, it is a one-time. The circuit breaker is in the circuit current sudden increase, more than the load of the circuit breaker, it will automatically disconnect, it is to increase the circuit a transient current protection, such as when a large leakage or short circuit, or transient current greatly when the protection. When identifying the reasons, can continue to use the closing. As mentioned above, the fuse fuse is the result of the current and the time together, and the circuit breaker, as long as the current one of the set value will trip, the time effect can not be considered. Breaker is a common component of low voltage power distribution. There is also a part of the place suitable for use fuse.