Fuse resistance

The definition of fuse resistance: resistors and fuses are similar in material and structure, and fuse-type resistors have both functions. They can be used as resistors at ordinary times. Once the current is abnormal, they will play the role of fuse to protect machinery and equipment.

Definition of fuse resistance: Resistors and fuses are similar in material and structure, and fuse-type resistors have both functions. They can be used as resistors at ordinary times. Once the current is abnormal, they will play the role of fuse to protect machinery and equipment. Because of the dual-purpose function, the cost is reduced accordingly. Fuse resistance can be divided into: metal film fuse resistor, fuse type wire wound resistor, fuse type cement resistor. There are several kinds of power: 1/4W, 1/2W, 1W, 2W. With the increase of power, the appearance size of the product will continue to increase. The resistance of the fuse resistor is generally small, most of which is less than 1 ohm. It often acts as a sampling resistor in the circuit. At the same time, when a surge occurs, or when a large current is generated, it plays a role when the circuit needs to be protected. Protective effects. At the same time, most of the fuse resistors are chip-type, relatively stable chip fuse resistors, generally called Jiebishen fuse resistors, Jiebishen chip fuse resistors. Products are divided into fast fusing and slow fusing.

What is the difference between resistance and resistance fuse

The meaning of the fuse resistor is the partial pressure current limiting, and it is generally connected in series with the load (electrical appliance) to prevent the load (electrical appliance) from burning out and forming a short circuit. It is also the role of insurance. I don’t know my explanation, no, my language skills are poor

The fuse is blown, and it needs to be replaced. The fuse resistance will not be broken, mainly to prevent the circuit from short circuit (short circuit is too dangerous, may cause fire, etc.). As for the resistance value of the insurance resistor, it depends on the actual problem. If it is too large, it will waste a lot of energy on the resistor

The difference between fuse resistance and fuse

The fuse resistor has a function similar to the fuse, that is, it can cut off the current when the circuit is overcurrent, and can also function as a fuse, so many people are easy to confuse, but the load of the resistor has a certain limit, and the current flowing through the resistor will exceed the limit. Burn out the resistor, making the resistor open. This is not the same as the fuse protection.

The fuse must have three functions at the same time: protection function, load-bearing function and safety function, and the fuse resistor cannot perform well in these three aspects.

Protection functions include overload protection and short-circuit protection, that is, when the circuit has an unallowable overcurrent to the limit of short-circuit overcurrent, the fuse must operate within the specified time range to protect the circuit or components, and the insurance Technical parameters such as the starting time and action duration of the resistor cannot be as accurate as the fuse, and the overload current protection cannot be guaranteed, and it can only play a little role in the short-circuit current. (Related reading: Which is the best fuse in Shenzhen)

The load-bearing function of the fuse is guaranteed by the melting heat value, so that the fuse can withstand the pulse impact of a certain energy with the necessary switching times. We need to calculate and evaluate when selecting it. However, the fuse resistance itself does not have similar technical indicators, so it can be used. If it is small, it will be interrupted by the pulse, and if it is used, it will have no protection function.

The safety function, the fuse is guaranteed through the rated voltage, breaking capacity and other indicators, especially through the authoritative third-party safety certification, but the insurance resistor itself is not a safety element, and does not require safety certification, its safety can be imagined However, it is known that the original protection function is insufficient, and it is difficult to ensure that no unsafe phenomena that endanger the surroundings will be generated during the burning process.

The meaning of the fuse resistor is the partial pressure current limiting, and it is generally connected in series with the load (electrical appliance) to prevent the load (electrical appliance) from burning out and forming a short circuit. It is also the role of insurance. I don’t know my explanation, no, my language skills are poor

The fuse is blown, and it needs to be replaced. The fuse resistance will not be broken, mainly to prevent the circuit from short circuit (short circuit is too dangerous, may cause fire, etc.). As for the resistance value of the insurance resistor, it depends on the actual problem. If it is too large, it will waste a lot of energy on the resistor

Can insurance resistors replace resistors?

The load of the resistor has a certain limit, that is to say, if the current flowing through the resistor exceeds the limit, it will be burned out, making the resistor open. In this sense, the resistor has a function similar to a fuse—that is, the circuit is over. It can cut off the current when it flows, which seems to be able to play a role as a fuse. Therefore, some manufacturers replace the fuse in the original design with a cheap fuse resistor in order to reduce costs, and formally give customers a sense of security.

But can the fuse resistor really replace the fuse and play the same role? The answer is obviously no!

As for the safety function, the fuse is guaranteed by the rated voltage, breaking capacity and other indicators, especially through the authoritative third-party safety certification, but the fuse resistor itself is not a safety element, and does not require safety certification, its safety can be It is conceivable that the original protection function is insufficient, and it is difficult to ensure that no unsafe phenomena that endanger the surroundings will occur during the burning process.

In summary, although the fuse resistor has the action of over-current blow-out, it does not really play the same role as the fuse.