Low-voltage fuse selection guide

Update date:2018-06-11 Source:MAXGE

A fuse is an electrical device that breaks a circuit when the current exceeds a specified value by melting the melt with heat generated by itself.

The main function of the fuse body in the circuit is to cut off safely and reliably when the circuit fails, thus providing protection for discrete components or the entire circuit. The following are the conditions for users to consider when selecting a fuse link:

fuse selection guide

1.Ambient temperature

The temperature of the air surrounding the fuse directly around the fuse should not be confused with room temperature. Normal operating temperature: -5 °C ~ +40 °C, and its average temperature within 24h does not exceed +35 °C. In many practical applications, the temperature of the fuse-links is quite high because the fuse-links are arranged in different structures of the support/base and the entire fuse is enclosed in the power distribution/control cabinet.



At 20°C ambient temperature, we recommend that the actual operating current of the fuse-link should not exceed the rated current. When choosing a fuse-link, consideration should be given to the environment and working conditions, such as the degree of closure, air flow, connection cable size (length, cross-section), instantaneous peak, etc.; the current carrying capacity of the fuse-link is tested at an ambient temperature of 20°C. The actual use

It is affected by changes in the ambient temperature. The higher the ambient temperature, the higher the operating temperature of the fuse-link and the shorter its lifetime. Conversely, operating at lower temperatures will extend the life of the fuse link.

fuse holder

3Fuse holder (fuse holder)

In many practical applications, fuse-links are mounted on the fuse support/base. They cannot be used as switches - not to switch on or off the load.

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