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Current fuse life

文章出处:Fuses factory Author:Yaxun Electronics Popularity: Time:2017-05-31 22:25 【Big Middle Small
Current fuse life
Factors that affect current fuses:Pulse current, working ambient temperature, contact resistance.

1. Pulse current:
   Impulse shock, will produce thermal cycling,Resulting in the proliferation of the fuse, oxidation, thermal stress, etc., or even accelerated.Fuses will gradually age as the pulse energy and frequency increase.Current fuse impact life,Depending on the pulse I2t the percentage of the fuse itself I2t;Often, it should be less than 20%So that the current fuse can withstand more than 100,000 times the impact.


2. Working environment temperature:
   Excessive ambient temperature is detrimental to the life of the current fuse.Slow-melting fuse such as solder ball,When the temperature is about 160 ° C (150 ° C to 170 ° C), the tin begins to diffuse into the wire;The temperature of the melt of the fast-fused current fuse begins to be about 200 ° C (175 ° C to 225 ° C).With the fuse from the outside to the oxidation,Multiple diffusion, thermal stress fatigue, etc.,The life of the current fuse will be gradually reduced.It is recommended that the delay fuse fuse should not work for more than 150 ℃ for a long time,Fast-blown fuse should not work for more than 175 ~ 225 ℃ for a long time.

3. Contact resistance:
   Current fuse contact with the tube clip,And the length of the connecting wire, the cross-sectional area and so on.Current fuse and pipe clamp contact resistance, damage to life,UL standards,The contact resistance between the current fuse and the clamp is less than 3mΩ.When the contact resistance is large,The tube clamp is not heat but generates heat and transfers to the fuse.

Current fuse life

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