WAZIPOINT WAZIPOINT Engineering Science & Technology: How to Calculate Fuse Rating for Electrical Appliances?

Tuesday, January 31, 2023

How to Calculate Fuse Rating for Electrical Appliances?

How Calculate Fuse Rating
Different Rating's Fuses

Fuse Rating Calculating Guide


The function of a fuse is to break a circuit when a current threshold is exceeded. It’s a single-function device, and historically single-use. Calculating the rating of very basic protection equipment fuse, we use the thump rule just select a fuse rated 150% - 200% of the normal operating current of the specific circuit. But actually, there are numerous calculations are involved in determining an appropriate fuse rating. Frequently necessary to consider other factors- including ambient temperature, available energy during a fault, inrush current, etc.

In order to select the proper rated fuse protective device, the following parameters and criteria need to be considered:

1.    What is the normal operating current of the circuit?
2.    What is the operating voltage?
3.    Is the circuit AC or DC?
4.    What is the operating ambient temperature?
5.    What is the available short-circuit current?
6.    What is the maximum allowable I²t?
7.    Are there in-rush currents available?
8.    Is the protective device being used for short-circuit protection, over-load protection, or both?
9.    What are the physical size limitations?
10.Is the PCB surface mount or thru-hole?
11.Does the fuse need to be "field-replaceable"?
12.Is reset ability an issue?
13.What safety agency approvals are needed?
14.How will I mount the device?
15.What are the cost considerations?

Formula to Calculate the Fuse Rating

Sponsored:
There is a simple and basic formula for working out the fuse rating, voltage or wattage for each appliance:

P=VxI

Where,
P for power in Watts;
V for voltage in volt);
I for current in Amps.

The fuse rating can be calculated by dividing the power used by the appliance by the voltage going into the appliance.

I (Amps) = P (Watts) ÷ V (Voltage).

Fuse Rating Calculation for Motor

A fuse for a machine is rated on the load that the machine carries when running. For example, a 1-HP (746W) motor operating at 115V would draw 746/115 = 6.5A at full load, so theoretically a 10A fuse would be sufficient.

What is Fusing Factor?

Fusing Factor is the ratio of minimum fusing current and current rating of fuse.
Therefore, fusing factor = Minimum fusing current or current rating of the fuse.
The value of fusing factor is always more than 1.

Fuse Size Calculation Formula

Fuse Wire Rating: The melting point and specific resistance of different metals used for fuse wire is as below:


MetalMelting pointSpecific Resistance
Aluminium240oF2.86 μ Ω – cm
Copper2000oF1.72 μ Ω – cm
Lead624oF21.0 μ Ω – cm
Silver1830oF1.64 μ Ω – cm
Tin463oF11.3 μ Ω – cm
Zinc787oF6.1 μ Ω – cm
Many times we have to face some physical places limitation to choose the fuse or circuit breaker mounting sizes.

It is this reason that fuse and circuit breaker manufacturers have created a wide selection of components with varying physical sizes. Typically however, there are a trade-offs that the engineer must consider.

Generally speaking, the smaller the fuse, the less current and/or capabilities that the fuse or circuit breaker may have. For example, a sub-miniature fuse maybe limited to 15A whereas the larger 1/4" x 1 1/4" glass tube fuse can accommodate up to 40A.

Additionally, although the fuse can be smaller, the corresponding fuse holder maybe substantially bigger adding to the consideration.

Get download the pdf copy of full guide to calculate the fuse ratings:

🔻Download🔻
Sponsored:

Read the article details on different type of Fuses and their uses

41 comments:

  1. Fuse is very simple and basic electrical equipment but importancy and uses is everywhere for everyone.

    ReplyDelete
  2. Thank you, I've just been looking for information about this topic for ages and yours is the best I have came upon so far.
    But, what in regards to the conclusion? Are you sure concerning the
    source?

    ReplyDelete
  3. I got what you intend, thanks for putting up. Woh I am pleased to find
    this website through google.

    ReplyDelete
  4. You can definitely see your expertise in the work you write.

    The world hopes for even more passionate writers like you who aren't afraid to say how
    they believe. Always go after your heart.

    ReplyDelete
  5. Does your blog have a contact page? I'm having a tough time locating it but, I'd like to shoot you an e-mail.
    I've got some suggestions for your blog you might be interested in hearing.

    Either way, great website and I look forward
    to seeing it expand over time. It is the best time to make some plans for
    the longer term and it is time to be happy. I’ve
    learn this put up and if I could I desire to counsel you
    some interesting things or suggestions. Maybe you could write subsequent
    articles relating to this article. I desire to learn even more issues
    about it! It is appropriate time to make some
    plans for the future and it is time to be happy.
    I have learn this put up and if I may I wish to recommend you few attention-grabbing things or tips.
    Perhaps you can write subsequent articles regarding
    this article. I wish to read more issues about it!
    http://foxnews.co.uk

    ReplyDelete
  6. Good information on fuse and their selection, We Every Spare Parts are well known supplier of fuses, kindly look at our collection in the link below:

    URL: https://everyspareparts.com/

    ReplyDelete
  7. One can see how efficient you are with what you write. Great work

    ReplyDelete
  8. It is a great choice for those who enjoy the design of an Xbox. Its high-quality construction and unique color options are just two of the benefits of a Dream brand modded controller. Source to know about 7 best electric nail files - household utilities.

    ReplyDelete
  9. Thank you so much for sharing this post. I’ve been looking for exactly this and you made it possible. It is very useful to me for electrical tagging. Sending much gratitude.

    ReplyDelete
  10. Watch and Download world's famous drama series Kurulus Osman in English on link below
    👇
    Kurulus Osman in English

    📢Get free .com domain name and start your own website
    Free .com domain name

    Crypto trading online course
    Join on link below
    Crypto quantum leap

    📒 Read Home doctor book online
    Then you will be a doctor for your family
    Home Doctor Book

    💰Create own NFTs and earn 1000$
    Complete guide
    Create NFT

    Join online YouTube course
    And be a professional YouTuber
    Tube Mastery and Monetization by matt

    🦷Steel Bite Pro
    Best product for
    Teeth pain, cavities,teeth whitening and other oral health issues with money back guarantee
    Steel Bite Pro

    ReplyDelete
  11. I am glad to be here and read your very interesting article, it was very informative and helpful information for me. keep it up. The Riddler Jacket The Batman

    ReplyDelete
  12. I am glad to be here and travisscottshop read your very interesting article.

    ReplyDelete
  13. https://charlidameliomerch.shop/Teeth pain, cavities,teeth whitening and other oral health issues with money back guarantee

    ReplyDelete
  14. Thanks for sharing superb information.https://chukkabootsmaker.com/ I’m impressed by the details that you have on this website.

    ReplyDelete
  15. This is the best post I have ever seen. Very clear and simple. Mid-portion Is quite interesting though. Keep doing this. I will visit your site again. https://trapstarshop.co.uk/

    ReplyDelete
  16. Thank you for helping people get the information they need.https://playboyclothing.net/

    ReplyDelete
  17. I really fell happy to read this chromeheartsoutfit.com post thanks for sharing this very good post.

    ReplyDelete
  18. Thanks for this. This is the simplest explanation I can understand given the tons of Explanation here.
    click here

    ReplyDelete
  19. I'm truly glad to say it's an intriguing post to read shophoodies. I get new information from your article.

    ReplyDelete
  20. shophoodies Actually quite glad to say, your post is extremely fascinating to read.

    ReplyDelete
  21. I read this article.Shop Here I think You put a great deal of exertion to make this article.

    ReplyDelete
  22. Ah thanks for this, I was scratching my head for hours, wondering how to calculate fuse rating.

    ReplyDelete
  23. The maximum safe current rating for any electrical appliance is the amount of current that could result in a fire.

    ReplyDelete
  24. The maximum safe current rating for any electrical appliance is the amount of current that could result in a fire.

    ReplyDelete
  25. Oh my goodness! a fantastic post dude. https://famoushoodies.com/ Thanks However My business is experiencing issue with ur rss .

    ReplyDelete
  26. This comment has been removed by the author.

    ReplyDelete
  27. Actually quite glad to say, your post is extremely fascinating to read.nikehoods.comgreat website you have got here.

    ReplyDelete
  28. The Assignment Helpline respects your blog; keep it up.We really enjoy reading your blog.This blog contains the aforementioned information on e-learning.
    Auditing assignment help

    ReplyDelete
  29. Today I was searching to hire someone to take my online class because I am doing an online course on Electronics. But I don't have enough know-how about that. After reading your post, I got my actual points and checklist, which will help me to pass my test. Thanks for sharing.

    ReplyDelete
  30. Today I was searching to hire someone to take my online class because I am doing an online course on Electronics. But I don't have enough know-how about that. After reading your post, I got my actual points and checklist, which will help me to pass my test. Thanks for sharing.

    ReplyDelete
  31. Manufacturers use a simple equation to calculate fuse ratings:
    Wattage = Voltage x Current (amps) The current (amps) is what we really want to know from this equation. Pay someone to do my online class
    Watts / Voltage = Amps. Assume we need to determine the fuse rating of a washing machine.

    850/120 = 7.08 amps.

    ReplyDelete
  32. Thanks for sharing this amazing and informative post. keep sharing with us.
    American leather jacket

    ReplyDelete
  33. articles that are nice and very interesting I like to read the articles you make. Kevin Costner Quilted Jacket

    ReplyDelete
  34. love the content of this blog and the positive you have. Thanks!
    gothic steampunk tailcoat mens

    ReplyDelete
  35. We are not limited to excellent prices. We provide our customers with stylish and comfortable jackets that catch the eye of everyone around you. We offer our customers the trendiest jackets from all over the world.
    Supreme NY Varsity Red Leather Jacket

    ReplyDelete

WAZIPOINT:
Thank you very much to visit and valuable comments on this blog post. Keep in touch for next and new article. Share your friends and well-wisher, share your idea to worldwide.

You may like the following pages