When the protection objects of windproof fuses are different, the selection of fuse types is also different. For example, for the protection of lighting circuits with small capacity or low-power motors, RC1A series plug-in fuses should be used because of the melting coefficient of the melt. Smaller is conducive to overcurrent protection of the circuit. On the contrary, for the protection of large-capacity circuits or high-power electrical appliances, other overcurrent protection devices must be installed in addition to fuses.
If you encounter a circuit with a large expected short-circuit current or a flammable gas situation, you can consider choosing RL series spiral fuses or RT series high-breaking fuses with high breaking capacity. Otherwise, you can use RM10 series fuses.
Should have good coordination with the overload characteristics of the protected object
Most electrical equipment has a certain overload capacity. Under certain conditions, excessive operation in a small amount and for a short period of time is no problem. For example, when high-power appliances such as air conditioners are started, the current will double and the fuse will You have to adapt to this characteristic, otherwise it will be very troublesome to break the circuit breaker easily.
Overstepping of fuses should be prevented
There must be good coordination between windproof fuses at all levels. Generally, the rated current of the upper level melt is about 2 to 3 times greater than the rated current of the lower level melt. When a fault occurs, the lower level fuse blows first. , and at the same time, after it is blown, the upper-level fuse can automatically recover. Otherwise, once an overlevel fuse occurs, a small wire short circuit may cause a large-scale power outage.
Attention should be paid to the influence of motor starting current
Considering the influence of motor starting current, fuses are generally only used as short-circuit protection of motors, and thermal relays should be used for overload protection.
Correct matching of rated power and melt rated current
The rated power should not be less than the rated current of the melt, and the rated breaking capacity should be greater than the larger short-circuit current that may occur in the circuit.
