Order your control relays and iec control products today. Contactors, and relays for hvac are available at wholesale and quantity pricing. Control by safety plcs or safety relays abbs afs contactors can be controlled directly by safety plcs or safety relays, or by a power relay depending on size. Hi luke, the only winding a contactor has is the coil,this is fed with a set voltage via the control circuit,most coils are marked with the opperating voltage and can be ac or dc,24volt,110 volt,240 volt,or 415 volt, upon completion of the control circuit the coil is energised and operates as a solinoid and attracts an armature which makes the conection between the contacts, most. The contactor is larger and capable of carrying more amperage than a relay. The main difference between contactors and relays is the loads that they are meant to handle.
Distant control of ac relays, contactors and starters bulletin no. All dil contactor relays have doublebreak contacts. These are devices which handle more than 20 amperes current. This includes power contacts, auxiliary contacts, and contact springs. Top advantages of scr power controllers over contactors. Contactor overloadbimetallic relay overloadsolidstate relay aux. Contactors can break current over a wide range of currents, from a few amperes to thousands of amperes, and voltages from 24 vdc to thousands of volts. A2 iec contactors relays a2 springer controls company 96074 chester road, yulee, fl 32097 904 2250575 fax. To complement the contactors, thermal overloads are offered for each frame size, available in several setting ranges. The enclosure is a frame housing the contacts and the electromagnet. These contactors have a low power consumption for direct control from plc outputs. What is the difference between a contactor and a relay. The product offering starts with minicontactors in a compact 12 amp frame size, followed by midicontactors in up to 100 amp frame sizes, and topped off with the powercontactors which offer up to 800 amp frame sizes. Working of relays a contactor is also a type of relay.
The manual contactor was a big improvement over the knife blade switch. Contactors are used for devices that pass more than 15 amps or loads of more than 3kw. Contactors are used when no overload protection is necessary, and at lower levels of electrical current. The most common for small direct online starters dols is 415vac, as this requires no neutral to be fed to the starter. Contactors and relays whats inside, how they work youtube. Download contactors and relays eaton book pdf free download link or read online here in pdf. Powerio manufactures solid state relays and contactors that are often used to replace mercury contactors. Features bimetallic ambient compensated overload relays available in three basic sizes covering applications up to 900 hp reducing number of different contactoroverload relay combinations that have to be stocked. The contactor relay contacts themselves constitute a considerable safety feature. Contactors can be combined with either manual motor starters of the sm series, providing thermal and magnetic protection up to 100a, or single or threepole thermal.
Contactors and relays perform the same task of switching a circuit. For example, i wanted to use the box switch that originally came with my lathe. The coil energizes the contactor, moving the contacts into position. Contactors, starters and protective relays electromechanical contactors and starters eatons lighting contactors are designed to provide a safe, convenient means for local or remote switching of tungsten incandescent filament or ballast fluorescent and mercury arc lamp loads. Many machines, especially old ones, required the use of relays or contactors in order to make their electrical systems to function. Therefore, this document is intended to describe about a few basic types of relays that are popularly used in typical loadcontrol. Iec industrial control relays for use in 24v, 120v, 220v and 240v applications. Variations of manual contactors are still in use today. The xt iec contactors are powerful, efficient and versatile, and can be combined with our full range of electronic overload relays and bimetal relays. Distant control of ac relays, contactors, and starters.
The sk series was created to fill the need for magnetic contactors with optimized performance and specifications required for this kind of application. This means that with a contactor, when it is deenergized there is typically no connection. Power to energize the generator line contactors is configure 3. Operated application alrt, talrt contactors are mainly used for controlling 3phase motors and more generally for controlling power circuits up to 690 v a. The contacts are the currentcarrying part of the contactor. Other than the low current contacts, they are also setup with normally open contacts. The contactor relay contacts themselves constitute a. Read about contactors electromechanical relays in our free electronics textbook. This is possible thanks to standardized work processes, modularisation and the use of. The basic principle of operation of the contactor and the relay are the same. Two typical manual contactors still in use today engineers eventually made a breakthrough with the magnetic contactor. A solidstate relay ssr is an electronic switching device that switches on or off when a small external voltage is applied across its control terminals. There may be times when youre working on a motor control circuit, where the contactor is located far away from the motor itself. The basic operation of contactors is similar to that of relays but contactor contacts can carry much more current than relays.
How a relay or contactor works and what is contained inside. Catalog afs contactors dedicated for safety applications. Nf contactor relays allow use in all parts of the world and in all network conditions. Magnetic contactors and thermal overload relays sk series. For example, for a 1 second time period for the control output, the scr can switch on and off to provide fine control. Contactors are most commonly used for controlling electric motors. As contactors are used for highcurrent load applications they are designed to control and reduce the arc produced when the heavy motor currents are interrupted. In working voltage 500v ue500v, 100,000 times for gmcd9c40c and. Contactors are almost exclusively designed to operate with normally open form a contacts. Xt iec contactors configuration contactors and starters.
An electromagnetic coil is provided for opening and closing of contacts. Relays and contactors use a variety of technologies to switch signals and power connections. There are posts on the working of relays, types of relays and so on. Instead, take a few moments to see if there is an obvious problem. When the stop push button is operated, the forward contactor drops out, the reverse contactor is energized through the plugging switch, control relay contact and. Contactors and relays eaton pdf book manual free download. The more expensive the electrical gear, the greater the number of relays that will generally be used.
This site is like a library, you could find million book here by using search box in. Read online contactors and relays eaton book pdf free download link book now. In this article, we will explain how each of these devices work and discuss some key selection considerations. All books are in clear copy here, and all files are secure so dont worry about it. With solidstate relays ssr, there are no contacts and switching is totally electronic. Much like a relay, a contactor is an electrically controlled switch. Ssrs consist of a sensor which responds to an appropriate input control signal, a solidstate electronic switching device which switches power to the load circuitry, and a coupling mechanism to enable the control signal to activate this. The same procedure can be used to check both contactors and relays. These dc devices stand out for their reduced power consumption, which makes them more energy efficient and also reduces the size of the power supply units. Relays are classified into several types based on their functionality and application they are implemented for. Both of them are electrically operated switches used for control and switching of loads. However, the basic difference between the relay and contactor is that the.
Xt iec contactors are suitable for global use and cover the. A contactor is an electrical device which is used for switching an electrical circuit on or off. The electromagnet or coil provides the driving force to close the contacts. Relays and contactors use a variety of technologies to switch signals and power. The contacts are opened and closed by exciting this electromagnetic coil. Difference between contactors and relays electrical classroom. Also find hard to find transformers, contactors, and relay replacement parts.
Contactors are used for loads that have high voltages, high currents, or both. Overload relays are designed to imitate on a much smaller scale the heating patterns of the electric motor it is installed in, and interrupt the current once the heat sensing mechanism in the relay reaches a certain temperature. Relay operation all relays operate using the same basic principle. Difference between contactor and relay difference between. How do i connect a contactor and overload to create a.
Enclosures are made of insulating materials such as bakelite, nylon 6, and. However, the basic difference between the relay and contactor is that the contactor is used in applications with higher current carrying capacity, whereas the relay is used for lower current applications. Contactors electromechanical relays electronics textbook. However, because the switch buttons do not hold their position, relays were necessary, i was told. How relays work relay diagrams, relay definitions and. Component ratings provide the flexibility to choose the desired level of protection, up to the rated maximum, and use it without the need for specific tested combinations and confusing tested combination spreadsheets. The decision to use electromechanical or solid state relays depends on an applications electrical requirements, cost constraints and life expectancy. Although they have been explained in earlier posts, their wide use and significance needs to be explained. These classifications include electromagnetic, solid state, high voltage, thermal relays, and so on. In electromechanical relays emr, contacts are opened or closed by a magnetic force. When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name. Applications include lighting circuits, heaters, and transformers.
The scr power control module also provides more accurate control of the process compared to contactors and solidstate relays. Relays on the other hand can and often are both normally open andor normally closed depending on the desired function. Since a contactor should last for years, dont automatically replace one that fails with an identical unit. In particular, large electrical gear as generators, motors and. There are three areas of problems encountered with contactors and relays the contacts, the coil, and the mechanical linkage. Contactors typically have multiple contacts, and those contacts are usually but not always normallyopen, so that power to the load is. Understanding relays page 4 autoshop, all rights reserved. Contactors typically have multiple contacts, and those contacts are usually but not always normallyopen, so that power to the load is shut off when the coil is deenergized. Bl 23j contactor coil and economizing switch circuit schematic. Since the coil clearing contacts are always located. Shop our parts hvac online store for transformers, contactors, and relays hvac supplies and accessories. In summary, contactors operate electromechanically and use a small control current to open and close the.
Contactors and relays contactors dil, overload relays z eaton wiring manual 0611 510 5 5 rated operating current ie a ac3 at 400 v max. Any one of the the three areas can cause a contactor or relay to malfunction. There are various types of contactors, and each type has its own set of features, capabilities, and applications. Both have an external envelope to protect all the internal parts from the external environment. Main catalogue contactors and contactor relays with ring. They both are commonly used in industrial and commercial applications, and. Resistance sensitive relays are devices with input sensitivity that enables. Solenoids, relays, and contactors are all electromechanical switches, but there are some critical differences that make each suitable for different applications. The basics how capacitors work working principle duration. Relays are either electromechanical relays or solidstate relays. If you see from the application point of view, you would have seen contactors placed in control panels of industrial motors or other heavy loads.
An overload relay is made up of a heater paired with normallyclosed contacts that open once the heater gets too hot. Many devices called relays use similar techniques and topologies. By design and construction they ensure potential isolation between the actuating circuit and the operating circuit, in the deenergized state, between the contact input and output. The mini contactor relays range offers various contact combinations and specific connection possibilities. The as contactor relays are efficient and allow you to optimize your equipment design.
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