company news about Common faults and troubleshooting of fuse

A. Melt fusing

1. Normal fusing due to short circuit fault or overload operation.

Troubleshooting: Before installing a new fuse link, first find out the cause of melt fusing. If the cause of fusing is not determined, do not replace the fuse link for trial delivery.

2. If the fuse link is used for too long, the melt will be broken by mistake due to oxidation or high temperature during operation, resulting in changes in melt characteristics.

Troubleshooting: When replacing a new melt, check whether the rated value of the fuse link matches the protected equipment.

3. The fuse link has mechanical damage during installation, which reduces its sectional area and causes false disconnection during operation.

Troubleshooting: When replacing a new fuse link, check whether the fuse link has mechanical damage and whether the fuse tube has cracks.

B.The fuse and power distribution device are burned at the same time, or the connecting wire is burnt and the terminal is burnt

1. Harmonic generation, when the harmonic current enters the distribution device, the current in the circuit increases sharply and burns out.

Elimination method: eliminate the generation of harmonic current.

2. The sectional area of the conductor is too small, and the temperature rise is too high to burn out.

Troubleshooting: increase the wire sectional area.

3. The connecting bolt between the terminal and the wire is not tightened, resulting in arc short circuit.

Troubleshooting: The connecting bolts must be tightened.

C.The temperature rise of fuse contact is too high

1. The contact surface of the fuse is oxidized or the dust is thick. The contact is poor and the temperature rises.

Troubleshooting: wipe the oxide with emery cloth, clean the dust, check whether the contact is in good condition, or replace the full set of fuse.

2. The fuse carrier is not screwed in place, and the contact is poor, and the temperature rises.