Log In. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action. Click Here to join Eng-Tips and talk with other members! Already a Member? Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free. Register now while it's still free! Already a member? Close this window and log in. Are you an Engineering professional? Join Eng-Tips Forums! Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. Could you tell me what is the fuse value should be? Thank you regards. Why build when you can purchase? Just buy two switchers! For starters, make the fuse blow at a current less than the current limit for your wires on the mains.
Otherwise one of the wires will become the fuse! This sets your maximum fuse value. Calculate your in-rush current when the supply first starts up. This sets your minimum fuse value.
At that point you can select any value in between these limits to meet other requirements. John D. Normally, you size to protect the transformer.This blog will bring you the latest industry news in electrical control panels, helpful Engineering tips, and more. Fuses are an overly abundant electrical component, and they come in all sorts of shapes and sizes.
This would make picking out a replacement easy, except there are so many types of fuses out there that the likelihood of two aesthetically identical fuses having the same operating specs is pretty low. This identity crisis can lead to mistakes in selecting a new or replacement fuse, which puts workers and equipment at risk.
For example, control circuit fuses have a variety of different voltage ratings, ranging from 32 V to V and interrupting ratings of up to kA. As the physical size of these fuses does not vary with voltage or interrupting rating, the most common cause of misapplication is due to improper voltage or interrupting rating selection. When a system fault occurs and an improperly sized fuse tries to interrupt an overcurrent event, there can be adverse consequences. If the fuse is too small in rating, it will trip too easily, leaving you with unexpected down time.
Making the Right Choice. When choosing your fuse sthere are three main things you need to look at: fuse type, voltage rating, and interrupting rating. Finding the right control circuit or supplemental fuse is easy when you take each of these into consideration. There are all kinds of fuse types from time-delays for inductive loads to fast-acting fuses for resistive loads. Making sure you are providing the right style of protection is a matter of first determining what your control circuit requires and then picking the type of fuse that suits that need.
The voltage rating must be equal to or greater than the circuit voltage for the proper application of an overcurrent protective device. If such a device is applied beyond its rating, there may be potential for fire and arcing energy, posing a severe fire risk to other components in the panel and to workers on the outside.
It is important to make sure you know the voltages that will be across your fuses so you can buy a properly rated fuse. Read More. Welcome to the PanelShop. Making the Right Choice When choosing your fuse sthere are three main things you need to look at: fuse type, voltage rating, and interrupting rating. Fuse Type There are all kinds of fuse types from time-delays for inductive loads to fast-acting fuses for resistive loads.
Voltage Rating The voltage rating must be equal to or greater than the circuit voltage for the proper application of an overcurrent protective device. Interrupting Rating The interrupting rating must be equal to or greater than the available short-circuit current. An overcurrent protective device must be able to safely interrupt short-circuit currents to which the equipment can be subjected. If the fault current exceeds a level beyond the capacity of the protective device, the device may rupture, causing additional damage.
Fuse vs. circuit breaker: How to choose the right device for your application
Therefore, it is important to use a fuse that can sustain the largest potential short-circuit currents. Failure to apply fuses with the appropriate interrupting rating can be a serious safety hazard. Ladder Logic Analysis of Signals and Errors. A well-designed control panel is highlighted read more. Recent Posts. Archives January 20 June 7 August 6. Popular Resources.This is an in-depth fuse tutorial explaining everything you need to know about fuses and how to size a fuse.
For your fuse to do its job correctly and protect your wires, it should be rated about 1. Actually, the load of the circuit should have nothing to do with choosing a fuse size.
So you just bought your stuff at Oznium and are getting ready to plan your installation while USPS gets it to your door. One of the first questions to ask when planning your installation is what size wire to use, which will later determine what fuse to use. Current is measured in Amperes, abbreviated to Amps or just the letter A. Add the values and divide by to get your total current in Amps. You can use this value in the fuse size chart above to determine the minimum wire size required.
Put 1. That table tells you that you should have no smaller than 21 gauge wire for your circuit. Fuse rating is the amount of current needed for the fuse to blow or break.
When this happens, it stops the electrical power from flowing through the electrical circuit. The fuse rating is a valuable piece of information because it helps you to protect your electrical circuit and therefore should never be neglected.
Every electrical circuit will need a different amount of electrical current, what is just right for one electrical circuit may be too much or too little for another. Do the right thing and protect your circuit. Hopefully this guide helps you to install all the products here at Oznium quickly and most importantly, safely.
Anyone who needs additional information or has specific or more complex installations, feel free to get in touch or post a question below. I have a question what size fuse in my car car should I run with a W LED high beam and low beam Just want to know what size I should be running to get the most out of my LED headlights whatever information you can give me that would be helpful thank you.
Or If there is some pre installed factory wire and you have changed the lights. If the wire shorts out and has too large a fuse installed it could melt the insulation right off the copper conductor and get so hot that it could start something on fire!
If I misunderstood what you were asking I apologize.How to calculate fuse load
That is only one part of the considerations of properly fuse protecting a circuit. I am installing a 20 amp max marine waterproof 12VDC socket above my rear bumper for accessories such as a tire inflator 15 amps. The cable run from the battery is approximately 15 feet. I want to ensure no power loss to plan on running a 10AWG wire. Is that too much, too low, or about right? MIght install separate fuse box in the engine bay, so can add more accessories later.
My question is How we check fuse rating ok, Like if our fuse is 40A and on the fuse have written 40A by manufacturer but how we check it is 40A I think may be that fuse 50 and 30 A so plese provide answer. To check whether a fuse blows at a certain current, you need to run different currents through it until it blows. I have a similar situation as a previous poster. I want to install an additional 12VDC 15A outlet in my car. Anyway, the pigtail with crimp is usually a 16AWG wire.
The inquiry I get from other people is what is the new outlet going to be used for. TIA for your quick reply. So instead of a 15A fuse, you might want to use a 10A fuse. I have a customer who has a Chinese made track hoe.Fuse is very simple and basic electrical equipment but importancy and uses is everywhere for everyone.
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I wish to read more issues about it! Keep in touch for next and new article. Share your friends and well-wisher, share your idea to worldwide. Different Rating's Fuses Fuse Rating Calculating Guide The function of a fuse is to break a circuit when a current threshold is exceeded. But actually there are numerous calculations are involved for determining an appropriate fuse rating.
Frequently necessary to consider other factors like- including ambient temperature, available energy during fault, inrush current, etc. In order to select the proper rated fuse protective device, the following parameters and criteria need to be considered:. What is the normal operating current of the circuit? What is the operating voltage?Control circuit fuses have a variety of different voltage ratings, ranging from 32 V to V, and interrupting ratings up to kA.
As the physical size of these fuses does not vary with voltage or interrupting rating, the most common cause of misapplication is due to improper voltage or interrupting rating selection.
When a system fault occurs and an improperly sized fuse tries to interrupt an overcurrent event, there can be adverse consequences. This mistake can lead to compromised system integrity—impacting personnel and equipment safety.
Circuit protection calculations can be easier with available online compliance software that helps calculate short-circuit current rating SCCR based on the components used in an electrical panel. Need continuing education credits?
Welcome to the PanelShop.com Blog
Save Your Seat. Three steps to select the right fuse for control circuit protection Fuses are the same size and generally look the same, and this identity crisis can leads to mistakes in selecting a replacement fuse, putting workers and equipment at risk.
By Nick Offerman July 1, Type, voltage, interrupt rating Find the right control circuit or supplemental fuse in three simple steps: Select the fuse type.
Select from time-delay fuses for inductive loads or fast-acting fuses for resistive loads. Select the voltage rating required. The voltage rating must be equal to or greater than the circuit voltage for the proper application of an overcurrent protective device.
The device can have a higher rating, but not a lower one; when an overcurrent protective device is applied beyond its rating, there may be potential for fire and arcing energy, posing a severe fire risk to other components in the panel.
Verify that the interrupting rating of the selected fuse is sufficient for the circuit application. The interrupting rating must be equal to or greater than the available short-circuit current. An overcurrent protective device must be able to safely interrupt short-circuit currents to which the equipment can be subjected. If the fault current exceeds a level beyond the capacity of the protective device, the device may rupture, causing additional damage.
Therefore, it is important to use a fuse that can sustain the largest potential short-circuit currents. Failure to apply fuses with the appropriate interrupting rating can be a serious safety hazard. Short-circuit current ratings Circuit protection calculations can be easier with available online compliance software that helps calculate short-circuit current rating SCCR based on the components used in an electrical panel.If you want to evaluate all reviews before they're published, you can add a few filter terms that would exist in any written review.
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How To Calculate Fuse Rating?
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