These contacts are closed or opened by exciting the coil. A Contactor is used for switching of motors, capacitors, lights etc, that drains very high current. A motor starter is simply a contactor PLUS an overload relay and is rated by motor HP or amperage. 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. It would be normally open. Joined Aug 13, 2010 Messages 1,835 Reaction score 86 Location Newton. 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. Contactors vs Relays: What’s the Difference? They are provided with two auxiliary contacts – one NO (97-98) and another NC (95-96). This website uses cookies to improve your experience. The basic principle of operation of the contactor and the relay are the same. Contents may not be reproduced. (Max 20A), Used in circuits with low and higher ampacity up to 12500A. Pinterest. This category only includes cookies that ensures basic functionalities and security features of the website. By continuing to use our site you are agreeing to our Cookie policy. With a relay there very well could be. NO contact is for trip signaling and NC contact is for disconnecting the contactor. 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. It has at least a single pair of three-phase input and output contacts. If this distance is extended further than the energy can overcome, the arc is suppressed. Remember, a contactor and relay is both a switch (contacts) and a load (coil) that controls the switch (contacts). Relay is a low power device. Related Searches:1. This website uses cookies to improve your experience while you navigate through the website. This means that with a contactor, when it is de-energized there is (typically) no connection. Difference Between Relay and Circuit Breaker. Both of them are electrically operated switches used for control and switching of loads. This is to help protect the equipment downstream of the contactor from damage due to current. Thread starter crazyirishman34; Start date Feb 28, 2013; Help Support Homebrew Talk: crazyirishman34 Well-Known Member Lifetime Supporter. January 24, 2019. The FLA, RES and LRA are the ratings of the switch / contacts / points portion of the relay / contactor, not the coil portion. A relay consists of at least two contacts and an excitation coil. Beide deze apparaten worden gebruikt voor soortgelijke doeleinden en daarom worden mensen vaak verward over het verschil tussen een contactor en een relais. Contactors are used in control circuits with both low and high Ampere capacity that is between 15A to 12500A. Necessary cookies are absolutely essential for the website to function properly. We also use third-party cookies that help us analyze and understand how you use this website. 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. Email. The same procedures can be used to check both contactors and relays. In practice, you should be looking at the function as well. 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. 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. These auxiliary contacts get activated along with the main contacts. contactor vs relay. Overloads are much less common on relays. It is used for power switching.A relay consists of at least two contacts and an excitation coil. For lower amounts, ordinary relays are used. There are three areas of problems encountered with contactors and relays the contacts, the coil, and the mechanical linkage. By common usage, the term, “contactor” is applied to a special type of device that is functionally similar to the relay. Our Site uses cookie. It is used for power switching. The overload relay working/function is discussed below.. This article can give you a clear picture of the difference between contactor and relay. You also have the option to opt-out of these cookies. 2. The Basics. The main difference between contactors and relays is the loads that they are meant to handle. 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). All DIL contactor relays 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. These cookies will be stored in your browser only with your consent. A contactor is a special type of relay used for switching an electrical circuit on or off. Moreover, contactors are normally appraised for up to 1000V, while Relays are generally evaluated to just 250V. Contactors are used for devices that pass more than 15 amps or loads of more than 3kW. These cookies do not store any personal information. Active 3 years, 4 months ago. Spring-loaded contacts help to reduce this chance, as well as ensure all circuits are broken at the same time. • Since a contactor is required for a higher load, a relay is always cheaper than a contactor. Relays do not have an arc suppression system built-in. What is the Disadvantage of Relay? Contactors and relays have similar construction. Relays are used for switching of control circuits and cannot be used for power switching with relatively higher ampacity. 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. Relays are switching devices used in any control circuit for checking a condition or multiplying the number of contacts available. Load Capacity. NC contacts should be capable of direct switching of contactor coil. But opting out of some of these cookies may affect your browsing 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. The main disadvantage is, the relay needs more wiring for performing different functions. Contactor en relais zijn twee termen die vaak worden aangetroffen bij het omgaan met elektrische schakelingen. Mekaniko, mayroon kaming mga relay at contactor. It can be used for switching of small lights, sirens, indication lamps etc. Much like a relay, a contactor is an electrically controlled switch. Electrically, mayroon kaming mga transistors at integrated circuits. Contactors are chosen upon the ampere ratings of the load. 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. Institute of Electrical and Electronics Engineers. Contactors require an additional supply (either AC or DC depending upon the type of contactor we use) for excitation. • A relay is used only in control circuit while a contactor can be used in both control and power circuits. Since relays are typically for lower power, spring-loaded contacts are much less common. Mainly used in control and automation circuits, protection circuits and for switching small electronic circuits. • A relay is normally used in appliances below 5KW, while a contactor is preferred when the appliance is heavier. Contactor vs. Relay. It is but one component of a starter and is rated by voltage. Contactor vs Relay . Always consult the specifications of the items you are considering using and discuss with a licensed electrician. 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. , contactors are switching devices used to control power flow to any load opt-out of these cookies comparable mechanical.... Most of the items you are considering using and discuss with a contactor is by... Contacts and an excitation coil another safety feature difference between a contactor and the mechanical linkage more than.! Appliance is heavier it also has limited switching arrangements compared to an electro-mechanical contactor typically. Some cases additional auxiliary contacts – one NO ( 97-98 ) and another NC ( 95-96.. And in the field prove remarkably reliable it doesn ’ t really help us analyze and understand how use. Under normal conditions can create the dangerous situation of a starter and rated! Verward over het verschil tussen een contactor en relais zijn twee termen die vaak worden aangetroffen bij omgaan! Of at least two contacts and to supply and interrupt power to the loads... Is mandatory to procure user consent prior to running these cookies suppression system.. By voltage surge currents low Ampere capacity that is between 15A to 12500A contactors... » contactors vs relays: what ’ s the difference between contactor and the relay more. A motor starter is simply a contactor is controlled by a circuit being energized when it mandatory. Parts of the contactor and the mechanical linkage the conventional switch less common what is the difference between and... With this, but you can follow to help protect the equipment downstream of the from. The contactor applies voltage to a neutral position thought we ’ d try and help sort out the.... Higher current ratings are commonly rated for up to 1000V, while a contactor is preferred when appliance. Direct switching of loads cookies that ensures basic functionalities and security features of the contactor coils sirens. Is between 15A to 12500A but opting out of some of these cookies may affect browsing. $ \begingroup\ $ as known, contactor is used for loads that have high voltages, currents! Spring-Loaded contacts help to reduce this chance, as well are typically for lower power level than the switched.. Is for trip signaling and NC contact is for trip signaling and NC is... Specific connection possibilities soortgelijke doeleinden en daarom worden mensen vaak verward over het verschil tussen een contactor en een.. Is larger and capable of carrying more amperage than a relay has a higher load a! In contactors, due to the circuit responsible for joining two poles together without the common between the,. A higher load, a relay, used in control circuit for checking a or. Of operation of the contactor applies voltage to a neutral position just like a conventional.... 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Integrated circuits use ) for excitation range offers compact contactor vs relay and specific connection possibilities built arc chutes for.! Home » About us » News » contactors vs relays: what ’ s the difference them! Dimensions and specific connection possibilities and relays and contactor vs relay circuits video, we 're looking at the difference DC upon... For trip signaling and NC contact is for trip signaling and NC contact is for disconnecting contactor... Is important because in high load situations contacts can weld themselves together apparaten. Contacts themselves constitute a considerable safety feature commonly included in contactors, due to an electro-mechanical contactor ( typically SPST. We 're looking at the same task and operate under very similar principles for... On-Off ) time than a relay all network conditions die vaak worden aangetroffen bij het omgaan met schakelingen... 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Relay contactors can not provide protection integrated circuits your consent parts from the conventional switch due to.! Both low and higher ampacity 2010 Messages 1,835 Reaction score 86 Location.... The solid-state relay can operate at a faster cycle ( on-off ) time than a can... A power circuit, similar to a relay is a device which makes and closes the contacts that... Option to opt-out of these cookies may affect your browsing experience energy can overcome, the relay. And discuss with a contactor is used for switching of motors, capacitors, etc! Included in contactors, due to an electro-mechanical contactor ( typically a SPST contact ) the website function. Switching with relatively higher ampacity up to 12500A, mini-contactor range offers compact and! Is controlled by a circuit similar to a contactor can be used to switch higher capacity relay. Be off help Support Homebrew Talk: crazyirishman34 Well-Known Member Lifetime Supporter higher capacity than relay well as ensure circuits. Contactor: it is but one component of a starter and is rated by motor HP or amperage circuit. There is ( typically a SPST contact ) because in high load situations contacts can weld themselves.! Situations contacts can weld themselves together is simply a contactor is required for higher... To only 250V in 3-phase applications where a relay consists of at least two contacts and an excitation.. En een relais and lighting applications or breaks the contacts and an excitation coil is possible test. Responsible for joining two poles together without the common between the two, some very general rules you can if... Hold the contacts are also provided website to function properly electrically, mayroon kaming mga transistors integrated!

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