Analysis and Maintenance of Common Faults of Fuse

When the melt is blown, it is necessary to carefully analyze the cause of the blow. The possible reasons are:
Normal fuse due to short-circuit fault or overload operation;
If the melt has been used for too long, the melt will be erroneously broken due to oxidation or high temperature during operation, which will change the characteristics of the melt;
The melt is mechanically damaged during installation, which reduces its cross-sectional area and causes false disconnection during operation.

When dismantling the melt, it is required to:
Before installing a new melt, find out the cause of the melt fuse. If the cause of the fuse is not determined, do not disassemble the melt for trial delivery;
When replacing a new melt, check whether the rating of the melt matches the protected equipment;
When replacing a new melt, check the internal burns of the fuse tube. If there is a serious burn, replace the fuse tube at the same time. When the porcelain fusion tube is damaged, it is not allowed to replace it with another material tube. When replacing the melt with the filler-type fuse, pay attention to the filler.

The maintenance work to be carried out when the fuse breaks down is as follows:
Clean the dust and check the contact condition of the contact points;
Check the appearance of the fuse (remove the fuse tube) for damage, deformation, and whether there are any traces of discharge flicker on the porcelain parts;
Check the fuse, whether the melt matches the protected circuit or equipment. If there is any problem, it should be investigated in time;
Pay attention to check the N line in the TN grounding system, the grounding protection line of the equipment, and the use of fuses is not allowed;
When maintaining and inspecting the fuse, you must cut off the power supply according to the requirements of the safety regulations, and it is not allowed to remove the fuse tube when the power is on.