Fuse selection guide

In order to enable users to select reasonable fuses when designing; better protect circuits, electrical components and equipment, a special fuse selection guide is formulated for reference by development engineers.

Parameters to be considered when choosing a fuse

1) According to the space where the user installs the fuse in the design circuit, select the appropriate size fuse.

2) According to the installation form required by the user in the design of the circuit, select a fuse with appropriate shape and characteristics.

3) According to the safety certification required by the user's product, decide to select the appropriate safety certification fuse.

   For example: C-UL, VDE, SEMKO, PSE, CCC, KC, BSI.

4) According to the effective circuit voltage of the user's product circuit, determine the rated voltage of the fuse.

5) According to the maximum normal working current of the user's product circuit, the rated current (In) of the fuse is preliminarily selected.

   - Consider the safety decay rate of the fuse.

   - Consider the temperature attenuation rate of the environment where the fuse is used.

6) Consider current pulses

   - Calculate the maximum pulse I2t value generated in the circuit.

   - Calculate the I2t value of the required fuse.

   If the user has pulses in the design circuit and has special requirements, generally choose a slow blow type fuse.

7) Finally select the specifications of the fuse.

8) The selected fuse specification samples are installed in the circuit and tested for normal operation.

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