What is the fuse link price related to and matters needing attention

What is the fuse link price related to?
1. For most people who buy fuses, the brand, and quality of fuses are particularly important. In the eyes of manufacturers, the better the quality of fuses, the higher the cost of raw materials and processing, and the price of the final fuses the higher. However, not all good-quality fuses are expensive, and prices vary by manufacturer and supplier.

2. There are too many fuses in the market, that is, oversupply. When many manufacturers and suppliers have too much inventory, the price of fuses will drop; when the supply of products exceeds demand, the price will rise again. And the type of fuse is insufficient and not commonly used, so the price of these products is a bit high, the supply source is sufficient, and the price of this kind of fuse is relatively stable for many circuits.

Precautions for using fuse link
1. Fuse link is connected in series with the line, installed vertically, and installed on each phase line; no fuse is allowed on the neutral line of a two-phase three-wire, or three-phase four-wire circuit.
2. The power inlet end of the spiral fuse should be connected to the center point of the base, and the outlet wire should be connected to the threaded shell; the fuse is used in places with vibration.
3. When the power load is greater than the lighting or electric heating load, tubular fuses should be used.
4. The voltage circuit of the watt-hour meter and the electrical control circuit should be equipped with control fuses.
5. Porcelain plug-in fuses use qualified lead alloy wires or copper wires, and multi-strand fuses must not be used instead of one large fuse.
6. Fuse link should be intact, and the contact should be tight and reliable. Combined with the maintenance of the power distribution device, check the contact, discoloration, deformation, and aging of the fuse, and replace the fuse if necessary.
7. After the fuse is selected, it is also necessary to check whether the selected fuse can protect the wire. If the wire section is too small, it should be increased appropriately.
8. The copper cap of the drop-out fuse should hold more than 3/4 of the upper contact at the melting tube, and there should be no damage or crack on the surface of the melting tube or the melt.
9. All fuses shall not be arbitrarily thickened, or replaced by copper and aluminum wires indiscriminately.
10. For new workshops, apartments, and buildings, multiple watt-hour meters are installed at each entry point. In addition to the main fuse box and fuses installed at the entry point, separate fuses should be installed behind each watt-hour meter.

What are the inspection contents related to the operation and maintenance of high-voltage fuses?
1. For general fuses, it is only necessary to check the contact condition of the fuse contact seat, whether the action indicator has moved, and the fuse with an additional current-limiting resistor in series
the device, it should be checked together with the additional resistor.
2. The fuse used for the protection of a single capacitor bank may malfunction or fail to operate in actual use. The inspection content is the quality of the fuse and the quality of the fuse.
The rated current selection, if it does not meet the requirements, should be replaced.
3. Poor quality fuses have the following conditions:
① The reinforced steel wire and the fuse wire are seriously corroded due to long-term contact with the air, and the mechanical strength is reduced; the fuse end is in poor contact and causes heat.
Natural fusing during normal operation.
② The arc extinguishing performance is poor, and re-ignition occurs during misoperation or breaking, often causing a large number of fuses to blow out one after another.
③ The mechanical strength of the outer tube is poor or the riveting is not good. When breaking a large current, it is often broken or thrown out.