1. The low-voltage fuse cannot be used as an overload maintenance of the motor.
2. The additional voltage of the fuse must be greater than or equal to the operating voltage of the distribution line.
3. The additional current of the fuse must be greater than or equal to the additional current of the melt.
4. The breaking capacity of the fuse must be greater than the largest short-circuit current that the distribution line may present.
5. The selection of the additional current of the melt is necessary to meet the normal operating current of the line and the starting current of the motor.
6. For short-circuit maintenance of electric furnace and lighting loads, the extra current of the melt is equal to or slightly greater than the additional current of the load.
7. For a single motor, the extra current of the melt ≥ the additional current of the (1.5-2.5) motor.
8. In the power distribution system, the upper and lower levels should cooperate harmoniously to complete the purpose of selective maintenance. The next level should be smaller than the previous level.
9. The porcelain plug-in fuse should be installed straight, and it is necessary to use a qualified fuse, and the fuse shall not be replaced by other copper wires.
10. The power inlet of the spiral fuse should be connected to the center terminal of the base, and the outgoing wire of the load should be connected to the terminal of the threaded shell.
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