company news about Selection method of general purpose fuse

        The selection of general-purpose fuses is mainly determined from the following three aspects:

        (1) Selection of fuse type.

        The type of fuse is mainly selected based on the load situation and the size of the circuit short circuit current. For example, for the protection of lighting circuits or motors with small capacity, it is advisable to use RCIA series plug-in fuses or RM10 series unfilled sealed tubular fuses; For circuits with large short circuit currents or occasions with flammable gases, it is advisable to use RL series spiral fuses with high breaking capacity or RT (including NT) series filled closed tubular fuses; For the protection of silicon rectifier devices and thyristor applications, fast fuses should be used.

The form of fuses should also consider the use environment. For example, tubular fuses are commonly used in large power transformation situations where the capacity is large; Plug-in fuses are commonly used in vibration free situations; Spiral fuses are mostly used for power distribution in machine tools; Electronic equipment generally uses fuse holders.

         (2) Selection of melt rated current.

          a. For resistive loads such as lighting circuits and electrothermal equipment, the rated current of the melt should be equal to or slightly greater than the rated current of the load because its load current is relatively stable and can be used for overload protection and short circuit protection.

          b.The starting current of the motor is large, so it is only suitable to provide short circuit protection for the motor. For the protection of a single motor that operates for a long time, it is considered that the melt cannot be blown when the motor is started.

          c. For fuses that protect multiple motors, considering that the melt will not fuse in the event of a peak current, the rated current of the melt should be equal to or greater than 1.5 to 2.5 times the rated current of the largest motor, plus the sum of the rated currents of the other motors used simultaneously.

          (3) Selection of rated voltage of fuse.

          The rated voltage of the fuse should be equal to or greater than the rated voltage of the circuit in which it is located.