{"id":1287,"date":"2022-09-13T04:34:37","date_gmt":"2022-09-13T04:34:37","guid":{"rendered":"https:\/\/ledask.com\/?p=1287"},"modified":"2022-09-13T13:34:54","modified_gmt":"2022-09-13T13:34:54","slug":"slow-blow-vs-fast-blow-fuse","status":"publish","type":"post","link":"https:\/\/ledask.com\/slow-blow-vs-fast-blow-fuse\/","title":{"rendered":"Slow Blow VS Fast Blow Fuse \u2013 Choosing the Best for Power Circuit Overcurrent Protection\ufffc"},"content":{"rendered":"\n

Fuse devices play important roles in circuits during current surges. They interrupt any inrush current<\/a>, therefore preventing further overflowing current from destroying other circuit components. While there are many types of fuses<\/a>, today, we will only discuss the slow blow VS fast blow fuse. Besides their definition, you’ll also learn the several criteria to consider before choosing or knowing a specific fuse. <\/p>\n\n\n

Slow Blow VS Fast Blow Fuse: Definition<\/strong><\/h2>\n\n\n

A fast blow fuse is a fuse that instantly bursts\/disconnects when you pass high power voltage through it. It is a common type in our day-to-day electrical equipment.<\/p>\n\n\n

\n
\"fast<\/figure><\/div>\n\n\n

(fast blow fuse)<\/p>\n\n\n\n

Conversely, a slow-blow fuse is a fuse that withstands high voltage levels for shorter periods without short-circuiting<\/a> itself. In other words, if the voltage changes suddenly or a short circuit occurs, the fuse will not blow immediately. Instead, it’ll tolerate the high currents, enabling you to switch off the power source or finish a task. <\/p>\n\n\n

Slow Blow VS Fast Blow Fuse: The Uses<\/strong><\/h2>\n\n\n

Generally, a fast fuse is ideal for home appliances<\/a> because of the appliances’ high sensitivity to electricity flow. Often, the fast-blow fuse allows the home appliances to last by immediately shorting itself rather than short-circuiting the electronic circuit.<\/p>\n\n\n

\n
\"home<\/figure><\/div>\n\n\n

(home appliances)<\/p>\n\n\n\n

Contrarily, a slow blow fuse is recommendable in the motor industry. When you start a motor engine, a high electrical current momentarily passes through its electric circuit. Under normal circumstances, the fuse blows. But, using a slow blow fuse enables the circuit to bypass and withstand the high current flow. Thus, the motor starts with ease. <\/p>\n\n\n

Slow Blow VS Fast Blow Fuse: How to select<\/strong><\/h2>\n\n\n

Undeniably, fast-acting and slow fuses perform the same function but differ based on build, structure, and duration of action. Luckily, we have outlined a stepwise means of choosing a suitable fuse for your electrical device. <\/p>\n\n\n

Step One<\/strong><\/h3>\n\n\n

The first identification process depends on the voltage type you aim at protecting. Usually, manufacturers rate fuses by either an AC or DC voltage. Also, some fuses can have a dual rate which means they’ll work for AC and DC voltages<\/a>. But, the ratings of fuses will differ depending on the overall power use. <\/p>\n\n\n

\n
\"AC<\/figure><\/div>\n\n\n

(AC and DC voltage symbols)<\/p>\n\n\n\n

Therefore, select fuses based on a specific power range and voltage of circuits to prevent catastrophic outcomes. <\/p>\n\n\n

Step Two<\/strong><\/h3>\n\n\n

Next, check on the amperage of the circuit (what the fuse protects in all applications like fluorescent lighting and motors). <\/p>\n\n\n\n

A fuse specific to a particular circuit permits the fuses to protect and shield devices from an overload or inrushing current. <\/p>\n\n\n

Step Three<\/strong><\/h3>\n\n\n

Thirdly, select a fuse based on its size. For this criterion, use a fuse holder specific to your type of fuse to fit in your fuse device.<\/p>\n\n\n

\n
\"Slow<\/figure><\/div>\n\n\n

(5-amp fuse holder)<\/p>\n\n\n

Step Four<\/strong><\/h3>\n\n\n

Nowadays, some fuses give you the flexibility of replacing burnt-out parts. So, instead of swapping the whole fuse, see if you can give back the burnt element. <\/p>\n\n\n\n

As we all know, manufacturers make fuse elements<\/a> using replaceable conductive metals. Just ensure you don’t damage the cartridge during the changing process. <\/p>\n\n\n

\n
\"Slow<\/figure><\/div>\n\n\n

(cartridge glass fuse)<\/p>\n\n\n\n

Step Five<\/strong><\/p>\n\n\n\n

Finally, as you buy your fuse, ensure you get one with an inspection window. The observation\/inspection window helps you know if your circuit has some issues, such as if you have a burnt fuse or not. <\/p>\n\n\n

How to Tell if a Fuse Is a Fast- or Slow-Blow?<\/strong><\/h2>\n\n\n

A fuse often sacrifices itself by suffering the damages affected by an increase in an electric current flowing through a circuitry. Thus, it is logical to want to replace it instead of buying the whole device. <\/p>\n\n\n\n

The guideline below will help you distinguish between a slow and fast blow fuse.<\/p>\n\n\n

Step One<\/strong><\/h3>\n\n\n

First, check for stickers or large labels on the fuse. The manufacturers’ labels often indicate the speed of fuse blow.<\/p>\n\n\n

Step Two<\/strong><\/h3>\n\n\n

Secondly, read to see if the manufacturer’s label fuse type is slow or fast. If the writing is S or T, it indicates slow-blow, but if it is F, it refers to a fast-blow fuse. <\/p>\n\n\n

\n
\"Slow<\/figure><\/div>\n\n\n

(labeling on fuses)<\/p>\n\n\n\n

There may be other letters, but they are unique fuses in particular devices. <\/p>\n\n\n\n

Step Three<\/strong><\/p>\n\n\n\n

Then, if you cannot find a label or sticker, feel for any raised letters on the glass tube case. The imprinted letters often house the fuse and show its type. <\/p>\n\n\n\n

Step Four <\/strong><\/p>\n\n\n\n

Next, use a magnifying glass to identify the fuse. Here, you’ll be seeing if its details are an inaccessible location or small in size. <\/p>\n\n\n\n

Step Five<\/strong><\/p>\n\n\n\n

Lastly, check the wire filament in the tube of the fused glass by looking through it. If you see a thick wire with a tiny spring at one end, it’s a slow-acting fuse. However, if there’s a thin fuse wire, then it’s a fast-blow fuse.<\/p>\n\n\n

\n
\"Slow<\/figure><\/div>\n\n\n

(slow blow and fast blow fuses)<\/p>\n\n\n

Conclusion<\/strong><\/h2>\n\n\n

To summarize, fuses help in overcurrent situations or when there are fault currents. Additionally, the different fuse ratings suit different applications. That’s why we have shown you how to distinguish between a slow-blow and a fast-blow fuse for various uses.<\/p>\n\n\n\n

If you still find it hard to differentiate between the two, do not hesitate to contact us<\/a> for professional help.<\/p>\n

<\/div>","protected":false},"excerpt":{"rendered":"

… <\/p>\n

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