Advantages and disadvantages of expulsion fuse cutout

The fuse invented by Edison more than a hundred years ago was used to protect the expensive incandescent lamps at that time. So do you know expulsion fuse cutout? The expulsion fuse cutout is also a kind of fuse. Next, let us take a look at the advantages and disadvantages of expulsion fuse cutout. Here are some answers.

Here is the content list:

• The main advantages and characteristics of expulsion fuse cutout.

• The main shortcomings and weaknesses of expulsion fuse cutout.

The main advantages and characteristics of expulsion fuse cutout.

Good selection of expulsion fuse cutout. The rated current of the upper and lower expulsion fuse cutouts shall be regarded as the upper and lower levels as long as they meet the requirements of the overcurrent selection ratio specified by the national standard and IEC standard of 1.6:1, that is, the rated current of the upper fuse is not less than 1.6 times, the value of the lower Can selectively cut off the fault current.

The expulsion fuse cutout has good current limiting characteristics and high breaking capacity. Under the rated working voltage, the breaking capacity of the expulsion fuse cutout can reach 80-120 kA.

In addition, compared with the circuit breaker, the expulsion fuse cutout has a small size, a large breaking capacity, convenient installation, and flexible use. In addition, the reliability of expulsion fuse cutout is good. Compared with the circuit breaker, the expulsion fuse cutout combination electrical appliance has a simpler internal structure and high reliability during operation.

The operation and maintenance cost of expulsion fuse cutout is low. In the event of a short circuit or overload failure, because the expulsion fuse cutout combined electrical appliance protects the fuse, it is a part of the expulsion fuse cutout that is damaged. You only need to replace the fuse part, which is convenient and quick. The circuit breaker protects the internal trip unit system, and the damage is the internal trip unit. In the case of several consecutive failures, the damage of the expulsion fuse cutout combined electrical appliance is still the melt. At this time, the circuit breaker cannot meet the usage requirements, and a new circuit breaker must be replaced, which is time-consuming and troublesome. Therefore, the operating cost of the expulsion fuse cutout combination appliance is much lower than that of the circuit breaker.

The main shortcomings and weaknesses of expulsion fuse cutout.

First, the expulsion fuse cutout must be replaced after it blows due to a fault. Second, the protection function of expulsion fuse cutout is single, with only a period of overcurrent inverse time characteristic, and this protection is used for overload, short circuit, and ground fault. Third, the expulsion fuse cutout cannot be remotely controlled, it needs to be combined with electric knife switches and switches to be possible.

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