Premium Membership. Study specialized technical articles, electrical guides, and papers. Thank u. I want to command the motor from a PLC output 24 AC and i want to control the speed of the motor with vdc.
Could you please guide me for selection of control relay for starting the motor. The motor data is VAC 50Hz single phase. Also can i use control relay for commanding the motor On and Off. The page before was better because it allowed copying or downloading what I published in PDF now and only lets print it bad that bad serivicio. I was better before. We are going to manu.
I have a two speed motor having twelve 12 input terminals. If yes please do suggest Institutes for the same Regards Sanjul. The starting current is 45Amaximum size of none time delay fuse is 11AWhy it will not blow? How will you calculate the contactor, circuit breaker, thermal overload and size of power cable and control cable for DOL starter when u are give a 3KW induction motor.
What is the basis of above calculation…. Provide International Standard for Calculation…. Thank you. Why the power factor is not included in the calculation although it has been give in the details?
Search for:. More Information. Related EEP's content with sponsored links. It helps you to shape up your technical skills in your everyday life as an electrical engineer.Fuses and Circuit Breakers both serve the same purpose — which is to protect electrical circuits by preventing overloads that can cause fires. They both interrupt the flow of electricity, but in very different ways from each other.
While a fuse is made of a piece of metal that melts when overheated, circuit breakers on the other hand, have internal switch mechanisms that can be tripped by an unsafe surge of electricity. Fuses can be quicker for interrupting the flow of power, but when they melt they must be replaced; circuit breakers on the other hand just need to be reset.N k pharma industries ahmedabad
Fuses come in different types — for both residential and commercial use. The most common type is made from a metal wire or a filament that is enclosed in a glass or ceramic and metal casing. When electricity flows, the fuse will permit the power to pass unobstructed across the filament between circuits.
If overloads occur, the filament melts and stops the flow of electricity. It will take some time for the filament to melt, and therefore any power surge is stopped. When a fuse is blown, it is to be discarded and replaced with a new fuse. There are different voltage and ratings that are available which handle different capacities of electricity. The best fuse for a circuit is usually one that is rated for slightly higher than normal operating current.
Circuit Breakers have two different ways of working — the first is through the use of an electromagnet and the other is through the use of a bi-metal strip. In both instances, when turned on, the breaker allows electrical current to pass from a bottom to an upper terminal across the strip. Once the current reaches any unsafe levels, the magnetic force of the solenoid or strip becomes strong enough to throw a metal lever in the switch mechanism, breaking the current.
The other option that can happen is that the metal strip can bend, throwing the switch and breaking the connection. In order to reset the flow of electricity, the switch can just be turned back on. This reconnects the circuit. Circuit breakers in many cases are found in a cabinet of individual switches known as the breaker box.
This simple switch action allows for an easy turn-off for individual circuits in a house when needed for working on a wiring in the location. Circuit breakers have other applications, such as using for ground fault circuit interrupter, or GFCI. The function of this is to prevent electric shock, rather than just overheating. It breaks the circuit in an outlet if the current gets unbalanced. It can be reset by the touch of a button, and is generally useful in kitchens or bathrooms, where electrocution is a risk from the use of electrical appliances near water sources such as sinks or faucets.
Fuses are more inexpensive, available at nearly any hardware store. They react quickly to overloading, offering more protection to sensitive electronic devices. The only problem in this is that if the circuit is prone to surges that regularly cause fuses to blow, then the quick reaction to the overloading can be a disadvantage.
When fuses are blown, they need to be replaced.Motors are usually protected by both fuses or circuit breakers and by heater coils in a magnetic starter. Fuses open the circuit quickly in case of a massive overload or short circuit. Heater coils provide a delay and open the circuit if the average current, over a period of time, is greater than the circuit is designed for.
In some cases it may be necessary to use delayed action fuses.
How to Size Circuit Breakers and Fuses for Motors
These provide a very short delay to prevent blowing a fuse during the short interval while the motor is accelerating up to its normal speed after being started. Current values in this chart are approximate, and are compiled from data published by several motor manufacturers. They may be a little high or low for a specific motor.
For selection of magnetic starter heater coils, it is better to follow the nameplate current rating of the actual motor to be used rather than depending on this or any other table. Wire and fuse sizes are listed for reference only, and may vary with type of insulation, number of conductors in a cable and other factors. Copies of the code can be ordered through most book stores. Other local ordinances may also apply. For selecting ampere rating of heater coils for magnetic motor starters, select the standard coil closest to the rating on the motor nameplate.
If motor operates in cold environment, the coil with next lower rating may be preferred. If in hot environment, the coil with next larger current rating may work better. For additional information, see Design Data Sheet If converting to Celsius, read the equivalent value in the column to the left.
If converting to Fahrenheit, read the equivalent value in the column to the right. The table was calculated from these formula:. Enter one of these columns with the temperature you wish to convert.
Download Data Sheet. Degree F Email Us. Tel: 1 Have a Question? Full Load Amps.For most of us who work in the electrical design field, the question of circuit protection is omnipresent in our day-to-day efforts.Mtv votar
There are a myriad of circuit protection technologies available that address phenomenon such as high voltage transients, inductive kick-back, capacitive coupling, high inrush currents and ground faults, just to name a few.
However, the most common circuit protection devices guard against over-current situations. As most of us already know, over-current protection is typically achieved by incorporating either a fuse or a circuit breaker within the primary power feed. The biggest question that faces most electrical designers is which one of these devices to select for any given situation. More often than not, our selection of either fuses or circuit breakers is based on past experience and personal preference.
In the context of any given industry, past experience is usually a good guide for this selection process. However, when changing projects or moving to a new job, what may be comfortable to you, may not be appropriate for the new application.Connection of a Single Phase Circuit breaker Panel
So what criteria do we use to select one or the other? The recurring argument that I have heard in favor of circuit breakers is that they are easier to reset after a failure situation has occurred. In these situations, the convenience of resetting the breaker only serves to postpone the inevitable correction or re-design of the circuit. On the other side of the fence, the usual argument in favor of fuses is that they are dirt cheap.
However, if a circuit blows fuses on a regular basis, the accumulated replacement costs associated with labor and down time can make a fuse set considerably more expensive over the long run. Additionally, if a fuse set is specified as an integral part of a power disconnect, then the cost is comparable to the equivalent circuit breaker arrangement.
It should come as no surprise that both fuses and circuit breakers have their pros and cons. Circuit breakers certainly have some very favorable attributes.
Another attractive attribute of breakers is that they are inherently safe. The electrical connections are typically located behind a protective panel, which completely eliminates any possibility of electrocution. This feature is quite valuable, especially in those situations when non-electrical personnel are required to service the equipment.
A third feature is that they usually provide a visual indicator when they have tripped. For many professionals, fuse sets also have a number of desirable attributes. As mentioned previously, they are particularly inexpensive when compared to their breaker counterparts. Wires are usually connected with integral screw-type terminal blocks. In addition to their mechanical simplicity, the electrical flexibility that fuses provide can be a considerable asset, especially when working with unique circuits.
In these cases, the selected fuse can be quickly changed for another unit that is better suited for the application. A good example of this is a machine that has a high power-up surge current.
The original fuse specified may be quite adequate for the run current, but may blow each time the circuit is energized. A fuse set allows the technician to quickly correct the situation at the minimal cost of a few new fuses. The original fuses are simply replaced with time delay, or slow-blow, units carrying the same current rating and the problem is instantaneously corrected.Huawei acl example
In that case, the breaker must be removed and replaced with an entirely new unit with a rating appropriate to the conditions.It is made of porcelain, glass or porcelain. The fuse link or fuse element is a thing metal strip made up of Copper, Silver, Aluminum, Zinc, or alloys. When overload occurs, the fuse element starts to melt immediately and break the connected circuit from the incoming supply.
Thus, it protects the whole circuit. In circuit breaker, electromechanical switch and relay mechanism trip the circuit when an unsafe value of current overload or short circuit attempts to flow in the circuit connected through circuit breaker.
Wire Size and Fuse Ratings for 3-Phase Induction Motors
This way, it protect the connected circuit by discounting it from power supply during faults such as overload or short circuit currents. Bothe Fuse and Circuit breaker are rated in Amperes which can be seen on its nameplate which is known as Rated Current or Nominal Current. We know that both fuse and circuit breaker having the same rated current say 30A will not trip when more than 30A say 32 is flowing through them.
But there is a big difference between fuse and circuit breaker i.
One of the main differences between circuit breaker and fuse is that a 30A rated current for both fuse and circuit breaker, a fuse need A and circuit breaker need A for tripping in 0. It shows very high difference in amperes.
Keep in mind that the full load current of the circuit which has to be protected by fuse should not more than the fuse current rating. Fuse and circuit breaker rating and selection is depends on multiple factors. As a general, we have to use the following formula to select proper fuse rating.
For example, we have to find the circuit breaker of fuse rating in ampere for 10A two pin socket where the load is 1kW and supply voltage is V AC V in US.
Circuit breaker can be reset like simple ON-OFF switch after an automatic operation while fuse should be replaced for post-of operation. One of the major advantages of circuit breaker over fuse is that a circuit breaker can be multiple poles. It can protect multiple lines whereas fuse is a single pole and can be used on single line. At all, as compared to fuse, a circuit breaker responds quicker, reliable in operation, and more sensitive. Your email address will not be published.
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Circuit Breaker. A fuse especially fuse element or fuse link is made up of a piece of metal Copper, Silver, Aluminum, Zinc, or alloys that melts when overheated at specific load. A circuit breaker has an internal electromechanical switch and rely mechanism that is tripped by an unsafe value of specified current in case of overload or short circuit. Provides detection as well as interruption tasks. This is an automatic process.
Provides interruption only. Faults detection is performed by relay inside CB. Fully Automatic Process.
Fuses or Circuit Breakers: Which should you use?
Automatic and Manual.Circuit breakers are not only great insurance for protecting your new motor, but they are also required by the Coast Guard for ungrounded current-carrying condutors. If this goes on for too long, the high level of current will permanently damage the motor, usually resulting in a completely totaled motor. Circuit breakers come in varying amperages, and you want one that has an amperage rating or amperage trip point that is just above the amperage draw of your motor at max speed.
Both Minn Kota and MotorGuide make their own breakers that are rated to break at an amperage level above what their motors draw. As just about all Minn Kota motors pull less than 60 amps at full speed, the Minn Kota circuit breaker is rated at 60 amps. The reasoning is that if 60 amps is being drawn from the Minn Kota motor, it's operating above the level it was designed for, and should be tripped. The exception are the MotorGuide Xi5 80 series, which require 60 amp circuit breakers.
Do you have to get a brand-specific circuit breaker? Definitely not. As long as the breaker is rated for a level slightly above the maximum amperage rating for your motor your should be just fine. Download detailed circuit breaker document. How to wire a circuit breaker. Browse our circuit breakers and related offerings. More fish!
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The order was delivered faster than expected. I will definitely and already have told others that this is the only place to go for trolling motors. Not only did they have the motor I was looking for, but I also saved a lot of money. Oh, and the motor arrived the next day. Keep up the great work, guys! CopyrightTrollingMotors.
Unavailable Sold Out. Guide to Circuit Breakers Fuse and Circuit Breaker Overview Circuit breakers are not only great insurance for protecting your new motor, but they are also required by the Coast Guard for ungrounded current-carrying condutors. Download detailed circuit breaker document How to wire a circuit breaker Browse our circuit breakers and related offerings. Need Help? We'll send your guide right over. What fishermen are saying…. Your Satisfaction is Our Top Priority.Electric motors have a very large amperage.
The wrong breakers and fuses may cause failure and overheat. Low voltage can also cause failure. When the circuit breaker or fuse is the right size, you can test the voltage. Ideally, the voltage at the end of the wire and the starting load requirements will be the same. Simply hook the small or large electric motor to the ends of the wire.
Turn it on. What does the voltage do? Is it dropping?
Does it stay the same? If the voltage drops, then your wires are too small for the motor. This depends on whether or not you use a circuit breaker. The chart below is a general guide to help you choose the right wire. Always talk with a professional when finding the right wires you need.
Additionally, you might need to increase the wire if the voltage drop is too significant. The fuse breaks the circuit when the current is too high. Do you know the full-load-steady-state current when at 25 degrees Celsius? You need to know that number to calculate the right fuse. Look at the power of your appliance or motor and the voltage. There are many types of fuses:. Always round up the rating after doing necessary calculations, or just call us at LN Electric.
We will be happy to help you calculate the right fuse for your needs. Your circuit breakers play a vital role in the primary electricity distribution system. Unfortunately, the simple fuse many times only handles a certain amount of amperage.
This depends entirely on its rating. On the other hand, a circuit breaker can be reset safely if tripped. Most homeowners use circuit breakers instead of fuses in their homes. The fuse tends to melt when overheated. Being able to re-use the circuit breaker is the primary advantage.
Choose the correct breaker or fuse for your motor every time. Selecting the wrong part can result in severe damage, failure, and even personal injury or property damage. Call the experts at LN Electric today. When you need to find the right motor, our impressive inventory has the solution you need.
Our friendly staff will be happy to find you the right products. Leaders in the field, LN Electric has decades of experience and excellent customer service.
We are dedicated to helping our clients find what they need every time, and at an affordable price. Contact us today.
Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Choosing the Right Fuse The fuse breaks the circuit when the current is too high.
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