Slow Blow Fuse vs Fast Blow Fuse Slow Blow Fuse vs Fast Blow Fuse

There are various types of fuses, for example a slow blow fuse, a fast blow fuse and a two-blade mini fuse. In today’s market, we find a fuse for every electronic need. If you are a beginner or you don’t have any experience whatsoever in electrical work, then you have to learn to distinguish among different types of fuses. Otherwise, you will eventually damage electronic equipment by installing an improper fuse. Hence, it is always recommended to install the same type of fuse originally used for a particular electronic circuit. In this article, we will go over some differences and common usages that exist between a slow blow fuse and a fast blow fuse.

The Definition of a Slow Blow Fuse and a Fast Blow Fuse

A slow blow fuse is defined as a fuse that can tolerate high levels of voltage for a short period without shorting itself. This means that when a short or a sudden change in voltage occurs, a slow blow fuse doesn’t burn immediately but withstands the high current for a short time, giving you the time to do what you were going to do or to turn off the power source. On the contrary, a fast (or quick) blow fuse is a fuse that bursts instantly when high power voltage is passed through it. This fuse is the common fuse we find in much everyday electronic equipment.

Uses for a Slow Blow Fuse and a Fast Blow Fuse

A slow blow fuse is normally used in the motor industry because when you start an engine, at that moment, a high current of electricity is passed through the electronic circuit. Hence, the fuses could be blown. By using a slow blow fuse, you bypass this problem because, as mentioned before, the slow blow fuses withstands that sudden high current flowing from the circuit, enabling the motor to start. So, a slow blow fuse is ideal in such circumstances. By contrast, a fast blow fuse is used in home appliances. Home appliances are very sensitive to changes in the flow of electricity. Therefore, you need a prompt reaction to counter this problem, and this is where a fast blow fuse comes in handy. The fast blow fuse permits the home appliance to survive by instantly shorting itself instead of the electronic circuit.     

    Slow Blow Fuse vs. Fast Blow Fuse

    As you can see, it’s not a matter of which is better but rather which is best for a particular situation. These two kinds of fuses have different characteristics to suit your electronic circumstances. As mentioned at the beginning, make sure to use the same type of fuse when replacing a faulty fuse.   

    An important thing to remember is that if you are unable to differentiate between the two fuses, you need to ask for professional help. Otherwise, you will damage the electronic equipment and, more seriously, you could get electrocuted and suffer serious injury. 

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