What is the role of the DW15 universal circuit breaker? Introduction to the conditions of use and structure

It is said that water and fire are ruthless, so when human beings use water and fire to serve human beings, they will inevitably invent many tools to protect ourselves. Fuses are a kind of equipment to protect circuit safety. This is mainly caused by the current in the circuit when the current is too large. It is mainly to blow the circuit to make the circuit open, so as to protect the circuit from excessive current and protect human safety. So, what is the principle of the fuse, what is the definition of the fuse? Xiaobian this is for everyone to introduce.

The role of the fuse in the circuit

1, the fuse is protected by overcurrent, in fact, is a fuse with arc extinguishing device.

2, the circuit breaker acts as a circuit breaker, and has overload protection, ground protection and leakage protection.

3. A relay is an "automatic switch" that can control a large current with a small current. Therefore, it plays the role of automatic adjustment, safety protection and conversion circuit in the circuit.

What is a fuse disconnector?

We know that the main function of the general isolation switch is to break the small current and change the operation mode. I don't know if you found out that one of them is disconnecting a small current. This is the problem. When the current is large enough, damage to the parts used for isolation in the isolating switch may result, making the switch unusable. It is with this in mind that in order to be able to disconnect large currents, it is more important to protect the isolating switch in the face of large currents, and it is necessary to provide a fuse (equivalent to a fuse) for protection, so that such isolation The switch is referred to as a fuse disconnector. To be more professional, it can be defined as follows: A fuse-type isolating switch needs to meet the following three points:

1. Protect the switch by using a fuse.

2. Isolation switch capable of carrying current under normal circuit conditions (including specified overload) capable of switching on, carrying and breaking current, and under specified abnormal circuit conditions (such as short circuit) and within a specified time.

3. It can provide safe isolation for the circuit, and ensure the circuit breaks and ensure safe operation when it is in the opening position.

Then add some notes about the fuse disconnector. In general, these types of isolating switches are mainly used for conventional circuits to provide protection. Generally, it is not used as a motor to open and close. Because the breakdown current of the motor during starting and stopping is too large, it is easy to cause damage to the fuse type isolating switch. Again, even for the same switch, when the rated heating current of the switch is different, the fuses used are not the same, for example, the HR6 fuse disconnector mentioned at the beginning of the article. When the rated current is 100A, the fuse used is NT00, and when the current is 250A, the fuse used should be NT1. For this, when we purchase the fuse-type disconnector, we need to pay more attention to it, and compare and match the situation to choose the right model to avoid unnecessary trouble.

The above small series introduces the role of the fuse in the circuit and so on, I hope to help you.