A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. Various types of relays are used in control and protection circuits. White paper on different types of relays the relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. Contactors are most commonly used for controlling electric motors. At the same time, it is necessary to ensure that the contact gaps are at least 0. We are a master distributor and valued added reseller of teminal blocks, miniature circuit breakers, enclosures, strain reliefs, interface modules, motor disconnect switches, safety relays, push buttons, european fuses, sensors and foot switches. 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 bimetallic overload relays, with or. Contactors are rated by designed load current per contact pole, maximum fault withstand current, duty cycle, design life expectancy, voltage, and coil voltage. Rotating biological contactors rbcs consist of a series of circular plastic disks mounted on a horizontal central shaft and distanced at 1.
Contactors up to 150 a for ac3 75 kw 400 v and 200 a for ac1 applications. However, most employers offer apprentices pay increases as they progress. Ddefinite purpose contactorsefinite purpose contactors the. The first three steps for selection will be the same. Contactors and relays contactor relays eaton wiring manual 0611 53 55 the system and the standard european standard en 50011 terminal markings, distinctive numbers and reference letters for certain. Emt6 thermistor overload relay for machine protection. Contactors are popularly used with electric motors. Reversing contactors are used primarily for reversing single or threephase motors in applications where running overcurrent protection is either not required or is provided separately. Jul 17, 2017 contactors are used to remotely switch electrical power. Normally 40% of the disks surface is submerged and they. Auxiliary contact modules snap on either side of the type dpa contactors. The coilactuated switch operates exactly like a relay, but a contactor typically handles higher amperages in the switch mechanism itself. Introduction water vapor is the most common undesirable impurity in gas streams. Starter contactor starter contactor aka starter relay is an intermittent duty relay meaning it is designed to be turned on only for short periods of time.
Unlike electrical contactor which we discussed above time delay relays nor not kind of normally open or normally closed type but the time delay operate in the area of closing and opening. A contactor is controlled by a circuit which has a much lower power level. Working of contactors electronic circuits and diagrams. The product offering starts with mini contactors in a compact 12 amp frame size, followed by midi contactors in up to 100 amp frame sizes, and topped off with the power contactors which offer up to 800 amp frame sizes. They usually handle very heavy loads like an electric motor, lighting and heating equipments and so on. Pages contactors 245012 to 245025 reversing contactors 245032 to 245103 1 with low consumption kit la4 dbl see page 245117. If a contactor is bought as an assembled package with an overload relay, it may be. Description of 3 pole and 4 pole contactors a9 a300 all aline contactors can be assembled side by side. Electrical contractors provide services that keep our lives. However, due to mechanical, as well as operational reasons, permanent magnets in synchronous machines are restricted to those with ratings much lower than large turbinedriven generators, which is the subject of this book. Holding circuit contact a normally open holding circuit contact for three wire control is provided on all contactors as standard. Although they have been explained in earlier posts, their wide use and significance needs to be explained in detail. The coil consists of many winds to a wire and is energized by a smaller voltage. Thanks to their extensive approvals, they can be used worldwide and are also ideally suited for use in harsh environments with high temperatures.
Coils can be changed quickly, without a tool, on the type dpa, 5090 a contactors. Contactors and relays contactor relays eaton wiring manual 0611 53 55 the system and the standard european standard en 50011 terminal markings, distinctive numbers and reference letters for certain contactor relays has a direct bearing on the use and application of the modular system. Large electric motors can be protected from overcurrent damage through the use of overload heaters and overload contacts. Every time you turn on a light, fire up a computer or grab a drink from the fridge, you should thank an electrician for delivering the power you need.
Electrical contractors provide services that keep our lives running smoothly. These low power consumption contactors are designed to control motors and other loads. These contacts are in most cases normally open and provide operating power to the load when the contactor coil is energized. Motor starters, contactors, and relays all operate on the same basic principle.
Breakers and switches switches changeover and transfer. Introduction to automation system sariati page 8 1. This course treats the subject of relays and contactors. Compact 1 and 2pole contactors are available, as well as fulls ize devices with 2, 3, or 4 poles. Pdf membrane contactors are mostly dedicated to industrial degassing of liquids, and generally speaking, to gas transfer with fluids. There are various types of contactors, and each type has its own set of features, capabilities, and applications. Tesys d contactors and reversing contactors are available from 9 a to 150 a inductive motor, and from 20 a to 200 a resistive loads in 3pole and 4pole versions. The sw80 series of contactors has been designed for direct current loads, particularly motors as used on small electric vehicles such as industrial trucks, powered invalid cars etc. Sep 24, 20 the sw80 series of contactors has been designed for direct current loads, particularly motors as used on small electric vehicles such as industrial trucks, powered invalid cars etc. Breakers and switches switches changeover and transfer switches. Relays are used to switch relatively small output and current. The range comprises of single pole, onoff types sw80, double pole, onoff types sw82, single pole normally closed types sw85 and paired versions of these for.
A contactor is a large relay, usually used to switch current to an electric motor or another highpower load. Contactor type 3pole lc1 d09 lc1 d12 lc1 d18 4pole lc1 dt20d098 lc1 dt25d128 lc1 dt32d188 reversing contactor type 3pole lc2 d09 lc2 d12 lc2 d18 4pole lc2 dt20 lc2 dt25 lc2 dt32 pages contactors 245012 to 245025 reversing contactors 245032 to 245103 1 with low consumption kit la4 dbl see page 245117. Auxiliary contact blocks description dp20 to dp40, 3 pole and 4 pole con. These relays are usually rated up to 10 or 15 amps. 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. Contactors electromechanical relays electronics textbook. A key feature is that the control circuit powering a contactor is electrically isolated from the. Box lugs are standard on 40 a contactors and larger. Simple catalog numbering for easy and fast ordering flexible with four overload relays. Contactor to switch relatively large output and currents.
Type s contactors are designed for operation at 600 volts, ac 5060 hertz. This includes power contacts, auxiliary contacts, and contact springs. Large iec contactors 100e 104e compact iec contactors 100c 104c the bulletin 100c offers a spacesaving design in a high performance contactor. Altech has been serving the automation and control industry since 1984. Selection guide tesys contactors tesys d contactors. Membrane contactors mc is a phase contacting device for use in gas absorption and stripping degassing processes as well as in biomedical gas transfer processes.
Contactors that are circulating in the market are generally differentiated based on their ability to control ac voltage. Noark electric is a global electrical producer and forms a part of an international. Contactors are used in applications ranging from the light switch to the most complex, automated industrial equipment. Contactors are used by electrical equipment that is frequently turned off and on. There are various types of contactors, and each type has its own set of. The low power consumption contactor is designed to control motors and other loads. A contactor is a relay that is used for switching power. Contactor relays dil two contactor relay series are available as.
Legal overview congressional research service summary federal procurement contracts are commonly divided into two main types fixedprice and costreimbursementthat primarily differ as to whether the government or the contractor assumes the risk of increases in the costs of performance e. The contactor is a voltagecontrolled switching device suitable for systems that frequently turn on and off the acdc circuit. Membrane contactors an overview sciencedirect topics. Sizes 002 contactors use a class 9999 sx11 auxiliary contact as the holding circuit contact. Motor logictm solid state, tesys t communicating solid state, adapted bimetal, and melting alloy types. Contactors, class 8910 types dp and dpa definite purpose contactors are ideal for heating, air conditioning, refrigeration, data processing, and food service equipment. The basics of contactors contactors are useful in commercial and industrial applications, particularly for controlling large lighting loads and motors. They consist of two contactors mechanically and electrically interlocked to prevent line shorts and energization of both contactors simultaneously.
Dile mini contactors for small motors and loads eaton. When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name. We are a master distributor and valued added reseller of teminal blocks, miniature circuit breakers, enclosures, strain reliefs, interface. Sometimes called ice cube relays because they are small and square and with clear plastic like an ice cube. Easy and simple direct mounting beetween contactor and circuit breaker, according to everlink terminal block from 40 to 65 a. Power power coil gets ground from mounting bracket. A general purpose motor control contactor may be suitable for heavy starting duty on large motors. Typically, apprentice electricians earn a lower salary than journeymen do. Contactors paired with an overload relay in this way and used in motor control service are often called starters figure 5. A coil solenoid, when energized, that creates a magnetic field a switch that is closed by the magnetic field generated by. Government agencies paid the top salaries, followed by manufacturing companies.
Several types of contractors qualify as electricians. T earth from the french word terre n neutral s separate c combined. There are different types of contactors, and the various types have their own sets of features, applications, and capabilities. However, like any other device, they are not infallible. In most cases, the contactor does not simply wear out from normal use. In this lesson well introduce the contactor, the principal interaction point between the control and power aspect of an electrically controlled system using motors. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Bulletin 400 definite purpose contactors are compact in size allowing for spacesavings while still supplying you with a highperformance product.
This video outlines the different types of contactors used today in industrial electronics, presented by katie rydzewski for galco tv. Control relays are used to allow or prevent specific operations depending on a defined permissive function. To complement the contactors, thermal overloads are offered for each frame size, available in several setting ranges. The coil of the contactor can be powered indifferently in ac or dc. File e42240, ccn nldx file lr25490, class 3211 04 definite purpose contactors class 8910 types dp, dpa and syd application data bottom tabs top hooks operating tab contactor auxiliary contact installation. Iec standard contactors our bulletin 100c offers spacesaving, highperformance design in 9.
The power circuit is engaged once the manual controller is activated by an operator. All contactors, thermal overload relays, and auxiliary contact blocks bear the ce mark. Mechanical interlocks fitted to operate between two contactors will also cause coil burnout if an attempt is made. Contactors are electromechanical switches that allow you to start and stop the flow of current in one circuit.
Selection guide tesys contactors tesys d low consumption contactors. An exclusive din track mounting option may reduce installation costs. Tech specs curtis dc voltage contactors sw80 bylong. This is a common type of contactor, sold by vans aircraft and others. Principal use is in high power electrical equipment requiring long contact life without maintenance, lowcost, high voltage control or sealed. Although the electric motor may operate on threephase, 480 volt ac power, the contactor coil and the rest of the control circuitry. However, due to mechanical, as well as operational reasons, permanent magnets in synchronous machines are. Air products and controls multivoltage relay module. The basics of contactors commercial electric products. Relays and contactors hvac controls a pdh online course for. Single phase contactors are comes with operating voltage of 230vac. Nhp technical news, issue 3 coil current to be at a higher level than the normal closed state. Features quick connect terminals and binder head screws allow for easy.
On the relay mounted to electromagnetic contactor at factory, marked i type name is not indicated. Type s ac magnetic contactors 3640 class 8502 3640 iec contactors 4142 iec contactors and auxiliary contact blocks 41 input modules and reversing contactors 42 type s ac magnetic starters4350 class 8536 4350 8538 and 8539 45,49. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. Contactors are relays designed for highcurrent applications.
Contactor types, structure and working principle xinli. Due to their compact, spacesaving size, eaton s dile mini contactors are used wherever small motors or loads need to be switched and controlled. This article, which is based on iee guidance notes, is intended to provide information that it is hoped will prove helpful. If the seriesconnected heaters get too hot from excessive current, the normallyclosed overload contact will open. Tesys d contactors and reversing contactors are available from 9 a to 150 a inductive motor, and from 20 a.
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