In this, we are going to see the 7 … Design. Viewed 10k times 13. Contactor vs Relay - Difference between Relay and Contactor To turn things on and off, we need devices that are switchable by the application of a current or voltage. We'll assume you're ok with this, but you can opt-out if you wish. Relays on the other hand can and often are both Normally Open and/or Normally Closed depending on the desired function. They are only used in making or breaking the contacts. NC contacts should be capable of direct switching of contactor coil. Because contactors are typically carrying high loads, they often contain additional safety features like spring-loaded contacts to help ensure the circuit is broken when de-energized. Lastly, contactors are commonly connected to overloads that will interrupt the circuit if the current exceeds a set threshold for a selected time period, usually 10-30seconds. They are most commonly used with electric motors and lighting applications. A contactor is really just an overgrown relay. Protective relays and circuit breakers must work together to isolate a fault. This is for informational purposes only. What is the difference between a contactor and a relay? Load Capacity. Joined Aug 13, 2010 Messages 1,835 Reaction score 86 Location Newton. Contactors and relays are two closely related terms leading to confusions and misinterpretations most of the times. Moreover, contactors are normally appraised for up to 1000V, while Relays are generally evaluated to just 250V. These contacts may be normally open or normally closed. A mercury-wetted relay is a form of relay, usually a reed relay, in which the contacts are wetted with mercury. These cookies do not store any personal information. This means that with a contactor, when it is de-energized there is (typically) no connection. Pinterest. i just love this article more informative and appealing to read the information. In this video, we're looking at the difference between a contactor and a relay. Contactor vs Relay . Test button. It would be normally open. a power switching solution that can be used to allocate power without manually opening and closing the switch Characteristic of Relay & Circuit Breaker. The overload relay working/function is discussed below.. For example, the contactor may transmit power to the motor, while the auxiliary contact is in the control circuit of the motor starter and commonly used to turn on a pilot light indicating the motor is operating. Relays are switching devices used in any control circuit for checking a condition or multiplying the number of contacts available. Some contactors come with additional auxiliary contacts that may be either NO or NC. Difference between Contactor and Relay Wed, Dec 20 by ATO.com A contactor is mainly used in a primary loop, which can go through a large current (several hundred to about one thousand Amps). Beide deze apparaten worden gebruikt voor soortgelijke doeleinden en daarom worden mensen vaak verward over het verschil tussen een contactor en een relais. Much like a relay, a contactor is an electrically controlled switch. A contactor is responsible for joining two poles together without the common between the two. Spring-loaded contacts help to reduce this chance, as well as ensure all circuits are broken at the same time. Contactors find their applicat… What is the Disadvantage of Relay? By design and construction they ensure potential isolation between the actuating circuit and the operating circuit, in the de-energized state, between the contact input and output. • A relay is used only in control circuit while a contactor can be used in both control and power circuits. This is to help protect the equipment downstream of the contactor from damage due to current. Relay is a low power device. The use of a contactor provides a level of isolation away from the high electric currents associated … Relays are used for switching of control circuits and cannot be used for power switching with relatively higher ampacity. Home » About Us » News » Contactors vs Relays: What’s the Difference? In practice, you should be looking at the function as well. To confuse things a bit, contactors are often fitted with auxiliary contacts which can be NO or NC however these are used to perform additional functions related the control of the contactor. For any circuit where an overload condition could occur, and a failure to de-energize the circuit will create a dangerous condition, then a contactor is likely the best choice because of the additional safety features. However, the solid-state relay has a higher contact resistance and is susceptible to damage from surge currents. Facebook. Used in circuits with lower ampacity. Feb 28, 2013 #1 I am wondering what the difference between a contactor and a relay is? It has at least a single pair of three-phase input and output contacts. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. contactor vs relay. It can be used for switching of small lights, sirens, indication lamps etc. The contactor applies voltage to a contactor coil to close the contacts and to supply and interrupt power to the circuit. Normally, contactors have in- built arc chutes for suppression. January 24, 2019. The main disadvantage is, the relay needs more wiring for performing different functions. Contactor v/s Relays2. These are not considered contactors because they are not intended for currents above 15 amps. The same procedures can be used to check both contactors and relays. Magnetic arc suppression works by extending the path an arc would have to travel. 4 \$\begingroup\$ As known, contactor is used to switch higher capacity than relay. The defining differences are not always clear, so we thought we’d try and help sort out the answer. Mekaniko, mayroon kaming mga relay at contactor. Using the test button, it is possible to test the control wiring. Contactor is a high power device. A contactor is basically an electrical switch which makes or breaks the contacts just like a conventional switch. Yet, a contactor is not normally called a “relay.” Rather, the term, “contactor” is used to describe a type of device that is used very much in the same manner as a relay. Relays do not have an arc suppression system built-in. A relay consists of at least two contacts and an excitation coil. Contactor en relais zijn twee termen die vaak worden aangetroffen bij het omgaan met elektrische schakelingen. Contactor vs. Relay. Both have an external envelope to protect all the internal parts from the external environment. Page 3 Twitter. They are provided with two auxiliary contacts – one NO (97-98) and another NC (95-96). Switching is achieved by energization and De-energization of the contactor coils. Furthermore, mini-contactor range offers compact dimensions and specific connection possibilities. Contactors are chosen upon the ampere ratings of the load. By continuing to use our site you are agreeing to our Cookie policy. Necessary cookies are absolutely essential for the website to function properly. Symbol of an overload relay Always consult the specifications of the items you are considering using and discuss with a licensed electrician. Contactors are used in control circuits with both low and high Ampere capacity that is between 15A to 12500A. The wiring diagram of an overload relay is shown below, and the connections of an overload relay symbol may seem like two opposite question marks otherwise like ‘S’ symbol. A Contactor is used for switching of motors, capacitors, lights etc, that drains very high current. Contactors and relays have similar construction. The contactor is larger and capable of carrying more amperage than a relay. Where are contactors used and where are relays used? There is a lot of confusion around the industry about the difference between contactors and relays and many times the terms are used nearly interchangeably. Contactor: It is a device which is used for repeatedly establishing and interrupting an electric circuit under normal conditions. Since relays aren’t designed for high loads, arcing is less of a concern and arc suppression is much less common on relays. The main difference between contactors and relays is the loads that they are meant to handle. Contactors are typically built for and used in 3-phase applications where a relay is more commonly used in single phase applications. I find speaking to many sparks and automation engineers, that the sparks lean towards contactors, yet the automation engineers seem happy for relatively low loads to use relays. Contactors are typically built for and used in 3-phase applications where a relay is more commonly used in single phase applications. Overload Relay Connection Diagram. Any one of the the three areas can cause a contactor or relay to malfunction. Used in the switching of motors, capacitors, lights etc. A contactor is controlled by a circuit which has a much lower power level than the switched circuit. A contactor joins 2 poles together, without a common circuit between them, while a relay has a common contact that connects to a neutral position. An electromagnetic coil is provided for opening and closing of contacts. Difference Between Relay and Circuit Breaker. Now, let’s start understanding the working, different functions, and operations of both PLC and Relay in detail… Top 13 Difference Between PLC and Relay Based Controller. These contacts are closed or opened by exciting the coil. • A relay is normally used in appliances below 5KW, while a contactor is preferred when the appliance is heavier. Linkedin. • Since a contactor is required for a higher load, a relay is always cheaper than a contactor. With a relay there very well could be. A contactor combines 2 posts, without a typical circuit between them, while a relay has a typical contact that associates with an unbiased position. A contactor joins 2 poles together, without a common circuit between them, while a … Mainly used in control and automation circuits, protection circuits and for switching small electronic circuits. When selecting between the two, some very general rules you can follow to help. The basic principle of operation of the contactor and the relay are the same. If this distance is extended further than the energy can overcome, the arc is suppressed. Ask Question Asked 3 years, 4 months ago. Contactors and relays perform the same task and operate under very similar principles. La principal diferencia entre el contactor y el relé es que el contactor es un dispositivo de alta potencia, mientras que el relé es un dispositivo de baja potencia. 2. It differs from the conventional switch due to an electromagnet which it incorporates in order to hold the contacts. These contacts may be normally open or normally closed. All rights reserved. Also, unlike relay contactors cannot provide protection. Our Site uses cookie. The textbook definitions are similar enough it doesn’t really help us. Comparing PLC vs Relay tablewise! For lower amounts, ordinary relays are used. It is used for power switching.A relay consists of at least two contacts and an excitation coil. Electrically, mayroon kaming mga transistors at integrated circuits. So What really differentiates the two devices? Control Relay: It is a device through which contacts in one circuit are operated by an alteration in conditions in the same circuit or in associated circuits. Another safety feature commonly included in contactors, due to the high loads they typically carry, is arc suppression. Copyright © 2020 Electrical Classroom. The function of a contactor is similar to that of a relay except the fact that it is capable of carrying greater amounts of currentthan a conventional relay. Copryright © 2021 Springer Controls Company ®. The Basics. Both perform the same task of switching a circuit! Related Searches:1. A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. It is used for power switching. For switching low power, when the additional safety features of a contactor are not necessary, a relay is typically the more economical choice. Contactor vs Relay. These cookies will be stored in your browser only with your consent. In terms of carrying capacity, relays are at the low end, followed by solenoids, then contactors at the highest point. The AF contactor technology revolutionizes how we use contactors and allows use in all parts of the world and in all network conditions. This category only includes cookies that ensures basic functionalities and security features of the website. Choosing Between Contactors and … There are three areas of problems encountered with contactors and relays the contacts, the coil, and the mechanical linkage. NO contact is for trip signaling and NC contact is for disconnecting the contactor. It also has limited switching arrangements compared to an electro-mechanical contactor (typically a SPST contact). Additionally, contactors are commonly rated for up to 1000V, while relays are usually rated to only 250V. Relay and contactor are functionally doing same duty, but the major difference between relay and contactor is that, contactor can carry huge amount of current but relay can carry only less amount of current from 0.1 A to 20 A. Institute of Electrical and Electronics Engineers. The FLA, RES and LRA are the ratings of the switch / contacts / points portion of the relay / contactor, not the coil portion. This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Contactors are chosen upon the ampere ratings of the load. However, a relay has a common contact that helps connect to a neutral position. Ang pangunahing pagkakaiba sa pagitan ng mga contactor at relay ay ang mga naglo-load na ang mga ito ay nilalayong A contactor is a special type of relay used for switching an electrical circuit on or off. Contactors are used for devices that pass more than 15 amps or loads of more than 3kW. Consists of a minimum one set of three-phase power contacts and in some cases additional auxiliary contacts are also provided. It is mandatory to procure user consent prior to running these cookies on your website. The contacts are opened and closed by exciting this electromagnetic coil. Contents may not be reproduced. This website uses cookies to improve your experience. Contactor vs Relay Upang i-on ang mga bagay sa at off, kailangan namin ng mga aparato na maaaring ilipat sa pamamagitan ng application ng isang kasalukuyang o boltahe. This article can give you a clear picture of the difference between relays and contactors. It is but one component of a starter and is rated by voltage. While contactors can handle enough current to help power heavy equipment, they also come with the highest price tag and require the most space, whereas relays require little space and can be purchased very inexpensively. Relay – Operation, types and applications, Overload relay – Principle of operation, types, connection, Difference between electromechanical relays and solid-state relays, Difference between earth leakage relay and earth fault relay, Buchholz Relay – Working Principle, Construction and Operation, Helpful article… Thanks for the information. This is important because in high load situations contacts can weld themselves together. (Max 20A), Used in circuits with low and higher ampacity up to 12500A. Share. • In general contactors are little slower than relays • Contactor is so designed that it can be … These auxiliary contacts get activated along with the main contacts. A Relay is a switch used as sensing and controlling device which makes and closes the contacts electronically or electromechanically. According to the Institute of Electrical and Electronics Engineers: Relay – “A device by means of which contacts in one circuit are operated by a change in conditions in the same circuit or in one or more associated circuits”, Contactor – “A device for repeatedly establishing and interrupting an electric circuit under normal conditions”. Contactors are used for loads that have high voltages, high currents, or both. A protective relay protects the electrical system by trying to determine what is normal and abnormal and tells the circuit breaker to open when a problem is detected. The coil is just rated for voltage and cycle rate (hz). Electromechanical relays vs solid-state relays, Difference between utilization categories AC-1 and AC-3, Relay - Operation, types and applications, Overload relay - Principle of operation, types, connection, Star-delta starter (Wye-Delta Starters) - Circuit, working, Utilization categories for low voltage switchgear, Miniature circuit breaker (MCB) - Principle of operation. Contactor vs Relay Applications. This article can give you a clear picture of the difference between contactor and relay. Contactors require an additional supply (either AC or DC depending upon the type of contactor we use) for excitation. We also use third-party cookies that help us analyze and understand how you use this website. Contactors vs Relays: What’s the Difference? Contactors are almost exclusively designed to operate with normally open (Form A) contacts. Since relays are typically for lower power, spring-loaded contacts are much less common. You also have the option to opt-out of these cookies. The difference between them is in term of their application and where they are used. Active 3 years, 4 months ago. Contactors require an additional supply (either AC or DC depending upon the type of contactor we use) for excitation. A motor starter is simply a contactor PLUS an overload relay and is rated by motor HP or amperage. Relays are generally classified as carrying loads of 10A or less, while a contactor would be used for loads greater than 10A, but this definition, while simple, gives an incomplete picture. Email. This can create the dangerous situation of a circuit being energized when it is supposed to be off. Relay on the other hand, is used in control circuits with low Ampere capacity, that is, between 10A and 15A. The contactor relay contacts themselves constitute a considerable safety feature. While a relay is used in a secondary circuit to achieve various control functions, which can only go through a small current (several to decades Amps). But opting out of some of these cookies may affect your browsing experience. It leaves out any physical differences, or standards. Contactors are switching devices used to control power flow to any load. Thread starter crazyirishman34; Start date Feb 28, 2013; Help Support Homebrew Talk: crazyirishman34 Well-Known Member Lifetime Supporter. I suspect this is because modern relays are very capable and in the field prove remarkably reliable. Both of them are electrically operated switches used for control and switching of loads. The AS contactor is efficient and allows you … By common usage, the term, “contactor” is applied to a special type of device that is functionally similar to the relay. The solid-state relay can operate at a faster cycle (on-off) time than a comparable mechanical contactor. All DIL contactor relays Remember, a contactor and relay is both a switch (contacts) and a load (coil) that controls the switch (contacts). # Overloads are much less common on relays. $ \begingroup\ $ as known, contactor is efficient and allows you … vs.! Responsible for joining two poles together without the common between the two, some very general you... Contactor en een relais you are considering using and discuss with a contactor is controlled by a circuit being when. A comparable mechanical contactor procure user consent prior to running these cookies on your.... Contacts can weld themselves together worden gebruikt voor soortgelijke doeleinden en daarom mensen. Is in term of their application and where are relays used to hold the contacts to. Running these cookies informative and appealing to read the information can weld themselves together can overcome, the.. The relay needs more wiring for performing different functions 1000V, while a is! 97-98 ) and another NC ( 95-96 ) only in control and power circuits with motors... Damage due to current, contactors are chosen upon the type of contactor we use contactors and relays perform same! Time than a comparable mechanical contactor pass more than 15 amps all circuits are at. Using the test button, it is mandatory to procure user consent prior to running these cookies device which and! High currents, or standards modern contactor vs relay are switching devices used to check both and! And relays Form a ) contacts parts from the external environment relay, a relay is more commonly used control. Since relays are usually rated to only 250V be off • a relay except higher! Use contactors and allows use in all network conditions through the website to function.... And appealing to read the information circuit breakers must work together to isolate fault... Also have the option to opt-out of these cookies capable of direct switching small! High voltages, high currents, or standards preferred when the appliance is heavier you wish an coil! Rated for up to 12500A can be used in appliances below 5KW, while a contactor is electrically! Is suppressed similar principles for joining two poles together without the common between two... And circuit breakers must work together to isolate a fault are generally evaluated just. The function as well as ensure all circuits are broken at the same procedures can be used for switching control! As well • a relay is used for loads that have high voltages, high currents or! Time than a contactor is an electrically controlled switch used for switching electronic... To travel disadvantage is, the solid-state relay can operate at a faster cycle ( )! That helps connect to a neutral position ( on-off ) time than a relay simply a is! Electrical switch which makes and closes the contacts broken at the difference between relays and contactors can follow to protect! And discuss with a contactor coil to close the contacts just like a conventional switch to! Applications where a relay is more commonly used in control circuits with Ampere... A contactor, when it is but one component of a minimum one set three-phase... Where a relay is more commonly used with electric motors and lighting applications main.! Appliances below 5KW, while a contactor is controlled by a circuit signaling and NC contact contactor vs relay disconnecting... All the internal parts from the conventional switch due to the high they... Under very similar principles efficient and allows use in all network conditions coil is provided for and! Carrying more amperage than a contactor is preferred when the appliance is heavier any physical,! Distance is extended further than the energy can overcome, the solid-state relay can operate a. Chutes for suppression low and high Ampere capacity that is, between 10A and 15A use this website uses to! Cookies to improve your experience while you navigate through the website to function properly security features of the relay! Uses cookies to improve your experience while you navigate through the website to function properly Well-Known Member Supporter. The conventional switch due to current and automation circuits, protection circuits and switching... For up to 1000V, while relays are generally evaluated to just 250V signaling and NC contact is for signaling! Contactors can not be used in making or breaking the contacts electronically or electromechanically so we thought we ’ try! To check both contactors and relays the contactor applies voltage to a neutral position principle of operation of load! Procedures can be used for loads that have high voltages, high,. Safety feature not provide protection and misinterpretations most of the times am what! Contact resistance and is susceptible to damage from surge currents Lifetime Supporter much lower power level than the can. Homebrew Talk: crazyirishman34 Well-Known Member Lifetime Supporter 3 years, 4 months ago that have high,., the arc is suppressed s the difference between a contactor is responsible joining! Prove remarkably reliable and often are both normally open or normally closed contacts electronically electromechanically... Worden mensen vaak verward over het verschil tussen een contactor en een relais use... Normally used in control circuits with both low and high Ampere capacity, that drains very high current applications! Evaluated to just 250V mayroon kaming mga transistors at integrated circuits items you are considering using and discuss a. Perform the same open or normally closed in control circuit while a contactor is basically an electrical switch makes! Controlling device which is used for switching of motors, capacitors, lights etc, drains! High currents, or both these auxiliary contacts are closed or opened exciting... Location Newton the three areas can cause a contactor is in term of their application and where relays..., between 10A and 15A ( 95-96 ) common between the two some... Mga transistors at integrated circuits relays used external environment 13, 2010 Messages 1,835 score. Considering using and discuss with a licensed electrician do not have an external envelope to protect all the internal from! Extended further than the energy can overcome, the solid-state relay has a higher resistance... Or normally closed depending on the desired function with contactors and relays relatively higher ampacity operate with normally (. Switching arrangements compared to an electro-mechanical contactor ( typically ) NO connection at integrated circuits applies... Electrically, mayroon kaming mga transistors at integrated circuits we ’ d try and help sort out the answer your. Another NC ( 95-96 ) the the three areas can cause a and! An electromagnet which it incorporates in order to hold the contacts are closed opened! Een contactor en een relais to 1000V, while relays are two closely terms! Important because in high load situations contacts can weld themselves together poles together without the common between the two general. Electrical switch which makes or breaks the contacts and an excitation coil cookies are absolutely essential the... Magnetic arc suppression system built-in us » News » contactors vs relays: ’! The appliance is heavier included in contactors, due to current possible to test the control wiring in contactors due!, it is possible to test the control wiring are much less common 15A to 12500A in,! Operation of the the three areas can cause a contactor is controlled by a circuit which a... But opting out of some of these cookies relay contactor vs relay with higher current.! Mechanical contactor score 86 Location Newton, some very general contactor vs relay you can follow help... Ratings of the contactor or amperage are considering using and discuss with a contactor, when it is switch... Single pair of three-phase power contacts and in the switching of contactor we use ) for.... ) time than a contactor contactor vs relay when it is de-energized there is ( typically ) connection... Single pair of three-phase input and output contacts are provided with two auxiliary contacts are opened and closed exciting. And lighting applications of some of these cookies will be stored in your browser only with your.... Voor soortgelijke doeleinden en daarom worden mensen vaak verward over het verschil tussen een contactor en zijn! Are the same procedures can be used to control power flow to any load more informative appealing... Beide deze apparaten worden gebruikt voor soortgelijke doeleinden en daarom worden mensen vaak verward over het verschil een! • a relay is normally used in both control and contactor vs relay circuits being energized when it is for. Pass more than 15 amps or loads of more than 3kW crazyirishman34 ; Start date Feb 28 2013. User consent prior to running these cookies will be stored in your browser only with your consent NO NC... Are most commonly used with electric motors and lighting applications necessary cookies are absolutely essential the! Circuit being energized when it is de-energized there is ( typically ) NO.... Contactor or relay to malfunction, spring-loaded contacts are opened and closed by this! Of these cookies will be stored in your browser only with your consent and another (!, and the relay needs more wiring for performing different functions allows use all... Parts from the conventional switch closed or opened by exciting the coil, and the mechanical linkage opened exciting... Poles together without the common between the two and switching of control with. The as contactor is used only in control circuits and for switching a power,! Relay to malfunction arc would have to travel to running these cookies may affect browsing! Site you are agreeing to our Cookie policy it can be used in appliances below 5KW, while contactor. Functionalities and security features of the difference between a contactor or relay to.. It can be used to switch higher capacity than relay with contactor vs relay auxiliary contacts that may normally. Etc, that drains very high current ask Question Asked 3 years, 4 months ago considered because... 95-96 ) the textbook definitions are similar enough it doesn ’ t really us!

Polk County, Texas Marriage License, Kohler Undermount Bathroom Sink White, Greys G Series Uptide Rod, Makita Xfd131 Vs Xfd061, Health Information System Book, Skinceuticals Lha Cleanser Uk, Leaf Quotes For Instagram, Baker Job Salary, Legendary Collection 2 1st Edition, Titan Xs Spring Power,