The composite glass fiber fuse tube is slightly higher, and it is necessary to prevent abnormal fuse phenomenon while being able to effectively protect the circuits of each system. It is a kind of protection appliance with simple structure, convenient use and low price. It is widely used in low-voltage power distribution systems and control circuits. It is mainly used as a short-circuit protection component, and is also often used as an overload protection component for a single electrical device.

General principles for the selection of composite glass fiber fuse tube

(1) The type determined according to the conditions of use.

(2) When selecting specifications, the specifications of the melt should be selected first, and then the specifications should be selected according to the melt.

(3) The melting protection characteristics should be well matched with the overload characteristics of the protected object.

(4) In the power distribution system, all levels should be matched with each other. Generally, the rated current of the upper-level melt is 2 to 3 times larger than the rated current of the next-level melt.

(5) For the protection of the motor fuse, attention should be paid to the influence of the motor starting current. Generally, it is only used as the short-circuit protection of the motor, and the thermal relay should be used for the overload protection.

(6) The rated current should not be less than the rated current of the melt; the rated breaking capacity should be greater than the large short-circuit current that may occur in the circuit.

The manufacturer chooses according to the use occasion (indoor, outdoor), voltage level, rated current, breaking capacity, and related fusing characteristics (current limiting characteristics, etc.). And should pay attention to the following matters:

1. Rated current of fusion tube

The rated current of the melt tube should be equal to or greater than the rated current of the melt

2.the rated current of the melt

The rated current of the melt should be greater than the larger load current, and its reliability coefficient is generally 1.1~2.0, depending on the specific situation, and consider the operability of the upper and lower actions in the same electrical circuit.

It should be pointed out. The fuse tube used to protect the voltage transformer does not need to consider the rated current, because the rated current of the composite glass fiber fuse tube for the voltage transformer is always smaller, for example, the fuse tube fuse rating on the high voltage side of the 6~35kV voltage transformer The current is generally 0.5A.

3.check the breaking capacity

For manufacturers without current limiting function, select the effective value of the short-circuit current impulse current for verification, while the current-limiting fuse tube uses the short-circuit current sub-transient current test.

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