A fuse will blow when there is an abnormality in the circuit that causes the temperature and current to rise above the fuse’s melting point. Usually, fuses without quality problems can be blown under working condition. But sometimes the fuse will not be able to blow normally because of some factors and abnormalities, which will easily cause damage to the circuit, electrical products, the next step is to understand what will be affected when the fuse works?

When the fuse is in use, it will be affected by the technical parameters of melting characteristics, rated current, rated voltage, breaking capacity and other factors. Fuse in the actual work of the circuit, but also by the circuit of the ambient temperature, and other aspects of the impact. For example:

1、 the fuse resistance is too large

The initial increase in internal resistance or the increase in internal resistance after aging of the fuse will lead to changes in the heat dissipation conditions of the fuse, which will make the fuse melting time faster.

2、Abnormalities in the holder of the fuse

Fuse connection methods such as single cap/double cap fuse, fuse with pins, card slot, etc., the bracket part is also one of the components of the fuse, but also an important link to ensure the performance of the fuse. If the connection part of the contact resistance increases, the consequences of the same as the increase in internal resistance, the small size of the fuse itself, the internal resistance is larger, and the working voltage is very low, sometimes there will be no current output phenomenon, this is not a problem with the fuse, but other external factors and caused by.

3、The heat dissipation environment of the fuse

Circuit heating/heat dissipation can affect the performance of the fuse, the distance between the fuse and the heating element, the degree of sparseness of the arrangement of components in the circuit, the connecting wires or PC board on the cross-section of the wire and the length of the work of the fuse fraudulent cruelty.

4、Other factors affecting the operation of the fuse

The fuse is connected to the circuit in the wrong way, when the fuse is connected to the circuit in parallel, and can not be effective overload protection of circuits and power equipment, the correct way is connected to the circuit in series.

The fuse resistance value affects the output power and power consumption.
The contact resistance value affects the operating time and speed of the fuse.
Ambient temperature affects fuse operation time and speed
Heat dissipation conditions affect fuse operation time and speed.