Polymer fuse cutout is a kind of electric appliance that disconnects the circuit by the heat generated by the melt when the current exceeds the specified value. It mainly plays the role of protecting the safe operation of the circuit.

When the circuit is faulty or abnormal, with the continuous increase of the current, and the increased current may damage some important components or valuable components in the circuit, it may burn the circuit or even cause a fire. At this time, the circuit breaker acts as a protection. function of the circuit.

How to choose a fuse?

1. Select the type of fuse according to the line requirements and installation conditions. For circuits with small capacity, choose semi-enclosed or unfilled enclosed type; for large short-circuit current, choose filled enclosed type; for semiconductor component protection, choose fast fuse.

2. Select the rated current of the fuse according to the load characteristics.

3. The selection of melts at all levels needs to cooperate with each other. The latter stage is smaller than the previous stage. The currents on the main gate and each branch line are different, and the selection of fuses is also different.

4. Select the rated voltage of the fuse according to the line voltage.

5. The protection melt current of the AC asynchronous motor cannot be selected too small (2~2.5 times the rated current of the motor is recommended). If the selection is too small, it is easy to cause the motor to run out of phase and burn out after the first-phase fuse is blown. It must be equipped with a thermal relay for overload protection.

To sum up

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