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What is a fuse-type isolating switch



The main function of the general isolating switch is to disconnect the small current and change the operation mode. One of the items is disconnecting the small current, which is the problem. When the current is large to a certain extent, it may cause damage to the parts used for isolation in the isolation switch, making the switch unusable. With this in mind, in order to be able to disconnect large currents, and more importantly, to protect the isolating switch in the face of large currents, it is necessary to provide a fuse (equivalent to a fuse) for protection, so that such isolation The switch is called a fuse disconnect switch.

The fuse type isolating switch needs to meet the following three points:

1. Protect the switch by using a fuse

2. Under normal circuit conditions (including specified overload), it can turn on, carry and break current, and under specified abnormal circuit conditions (such as short circuit) and within a specified time, an isolating switch that can carry current

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

Points to Note About Fuseddisconnect . Generally speaking, this type of isolating switch is mainly used for conventional lines for protection. Generally, it is not used as a motor switch, because the breakdown current of the motor is too large when it starts and stops, and it is very easy to cause damage to the fuse-type isolating switch. Again, even for the same type of switch, when the rated heating current of the switch is different, the fuses used are different.