Contactors definition of contactors by the free dictionary. Schaltbau gmbh sales memo correct presentation date. Contactor definition of contactor by the free dictionary. Types of construction contracts and their comparison pdf. They can print out blank forms for all the applicants to fill out. These contactors are of the block type design with 3 main poles. For all intent purposes, a contactor is a relay, as shown in figure 2. Since interferencefree disconnection is impossible.
Photo about contactor wiring work in motor control panel. Model gx11 and gx12 contactors feature 12 and 24 vdc highefficiency coil options that can power switch up to 750 vac or vdc. 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. Contactors electromechanical relays electronics textbook. A contactor can carry the normal current for more than 8 hours. Factors of contactors contact design the following factors consider while designing the contactors contacts relay, magnetic and electrical contactor trending up tp 93% off launching official electrical technology store shop now. The following contactor series are supplied by repco. Contactor an electrical device used for frequent closing and opening up to 1,500 operations per hour of power circuits carrying. Stay connected and signup for emails to get the latest specials on equipment. Jan 09, 2012 werners 53 series general purpose contactors are most robust, economical and readily accepted by all segments of industries where a prime mover is involved.
Contactor page 1 of 5 toggle navigation toggle search. Although they have been explained in earlier posts, their wide use and significance needs to be explained. Jennings contactors consist of a vacuum interrupter and an actuator linked together by an insulated actuating rod. All structured data from the file and property namespaces is available under the creative commons cc0 license. There are posts on the working of relays, types of relays and so on. Because they are humfree they are suitable for use in. Contactor definition is a device for repeatedly establishing and interrupting an electric power circuit under normal conditions. Unlike a circuit breaker, the contactor is not intended to interrupt a short circuit current. Electrical contactors, as shown in figure 1, are switches that are turned on and off with electrical power rather than with the direct push of a button or flipping a toggle switch figure 1 electrical contactor figure 2 plugin relay for all intent purposes, a contactor is a relay, as shown in figure 2. Ampere rating maximum motor hp maximum motor kw number of poles open type with metal mounting.
Within the air conditioning oem segment, dp contactors can be grouped into two main categories, depending on the application. 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. Drive contactors type eflg, eh, ehdb drive contactor, general purpose type eg, type aafaetae, and type b contactor. Rated insulation voltage the voltage, on which performs the dielectric test. Contactors are most commonly used for controlling electric motors. A contactor can be close for a long time from 8 hours to many years without interruption. The first three steps for selection will be the same. Air products and controls multivoltage relay module. There are various types of contactors, and each type has its own set of features, capabilities. When the contactor operates there is no mechanical overlap between. In summary, contactors operate electromechanically and use a small control current to open and close the circuit. Motor starters, contactors, and relays all operate on the same basic principle. Contactors and relays contactor relays moeller wiring manual 0208 53 5 the system and the standard european standard en 50011 terminal markings, reference numbers and reference letters for certain contactor relays has a direct bearing on the use and application of the modular system. Contactors are rated by designed load current per contact pole, maximum fault withstand current, duty cycle, design life expectancy, voltage, and coil voltage.
The basics of contactors commercial electric products. Apr 05, 2010 within the air conditioning oem segment, dp contactors can be grouped into two main categories, depending on the application. Buy the item featured in this video at 8003371720 or visit. A contactor is controlled by a circuit which has a much lower power level than the switched circuit. This video outlines the different types of contactors used today in industrial electronics, presented by katie rydzewski for galco tv. Project owners and contractors can both make use of bid forms to outline all of the terms and the conditions of a construction project. Maintenance free vacuum contactors provide fast arc extinction and rapid recovery of dielectric strength. A contactor is a large relay, usually used to switch current to an electric motor or another highpower load. Files are available under licenses specified on their description page. Contactors up to 96 a offer free choice of coil terminal access and can take side and front. If you would like to participate, you can choose to edit the article attached to this page, or visit the project page, where you can join the project and see a list of open tasks. Factors of contactors contact design electrical technology. Electrical contactors, as shown in figure 1, are switches that are turned on and off with electrical power rather than with the direct push of a button or flipping a toggle switch.
For a three phase contactors, the voltage between phases is called rated voltage or operational voltage. Werners 53 series general purpose contactors are most robust, economical and readily accepted by all segments of industries where a prime mover is involved. Electrical contractors provide services that keep our lives running smoothly. Replacement coils are available for some of the 3 pole contactors. All accessories can be used with all type of contactors.
The most essential aspect of the document is its assurance that the. A new salary employee contract template that is being used as a result of the employee being promoted should still have all of the information that is found in a regular employeremployee contract template salary details, legal jurisdiction, signatures, etc. Weg coil for size cwm9 to cwm25 contactors 400vac bca425. However, like any other device, they are not infallible. The switches are available in spno, spnc, spdt and 1no1nc configuration. Download 2d or 3d files according to your needs step, iges.
Jan 04, 20 this video outlines the different types of contactors used today in industrial electronics, presented by katie rydzewski for galco tv. Applications include lighting circuits, heaters, and transformers. This page was last edited on 8 january 2019, at 10. Contactors range from those having a breaking current of several amperes to thousands of amperes and 24 v dc to many kilovolts. Unlike a circuit breaker, the contactor is not intended to interrupt a short circuit.
V5t442 volume 5motor control and protection ca0806eseptember 2016. For example, an ibs contractor might install a smart home system that integrates a home security system with wifi enabled closedcircuit cameras and automated light fixtures that must activate simultaneously during a burglary. Nemarated contactorsmotor starters are generally more rugged than iecrated units. Contactor definition of contactor by merriamwebster. Compact 1 and 2pole dp contactors, which range from 20 a to 40 a, and standard frame dp contactors, from 15 a to 360 a.
Contactors article about contactors by the free dictionary. These low and medium voltage contactors offer the most reliable means of remotely controlling electric power. An electrical relay used to control the flow of power in a circuit. There are different types of construction contracts and their comparison is presented in this article. The term relay is used in the electronics industry and is usually applied to switching. Enclosures are made of insulating materials such as bakelite, nylon 6, and. Ibs contractors must integrate complex systems, comprising different types of technology, to work in concert. Contactors come in many forms with varying capacities and features. Chapter 12 contactors and magnetic control starters. Working of contactors a contactor is also a type of relay. A construction contract is an agreement between two or more parties to execute the construction works as per certain terms and conditions. Ac dc operated with screw terminals af094000 af092200 culus ce application. A general purpose motor control contactor may be suitable for heavy starting duty on large motors. Drive contactors type eflg, eh, ehdb drive contactor, general purpose type eg, type aafaetae, and type b contactor these contact sets for asea brown boveri abb motor starters are normal stock for immediate delivery from repco.
Contactor relays are often used in control and regulating functions. Most contactors are designed to be used in the normally open position. These construction contract templates can be easily customized according to your needs you can add or remove clauses. However, due to oxidation and dust on contacts, temperature may be increased. Contactor types af09 af16 af26 af38 standards ul 508, csa c22.
The basics of contactors contactors are useful in commercial and industrial applications, particularly for controlling large lighting loads and motors. A construction contracts contains general and special conditions of agreement, details of construction. Contactors are used when no overload protection is necessary, and at lower levels of electrical current. Figure 1 electrical contactor figure 2 plugin relay. 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 without singlephase protection up to 420a, to obtain nonreversing or reversing starters. This includes power contacts, auxiliary contacts, and contact springs. Possible to print the page to a pdf file or from your printer. Af09 af38 4pole contactors ac dc operated with screw. These contactors are suitable for controlling 2 separate circuits, i.
Affordable and search from millions of royalty free images, photos and vectors. These relays are usually rated up to 10 or 15 amps. Although they have been explained in earlier posts, their wide use and significance needs to be explained in detail. Ge controls and power electronics for industrial applications. What we need to look at briefly is the operation of the contactor. Several types of contractors qualify as electricians. Relays and contactors use a variety of technologies to switch signals and power connections.
Features of contactors a contactor is a relay that is used for switching power. Contactors synonyms, contactors pronunciation, contactors translation, english dictionary definition of contactors. The electromagnet or coil provides the driving force to close the contacts. If the seriesconnected heaters get too hot from excessive current, the normallyclosed overload contact will open. A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. Large electric motors can be protected from overcurrent damage through the use of overload heaters and overload contacts.
Nemarated contactors motor starters are generally more rugged than iecrated units. The contacts are the currentcarrying part of the contactor. Contactors have features that distinguish it from a standard relay. In most cases, a contactor is designed specifically with high current usage in mind. Numerous construction contract templates are available. Proteus switchgear industrial division stafford park 12 telford shropshire tf3 3bj t. In the last post i took the control circuit through to the contactor coil for the purpose of fault finding. In general, contactors and motor starters are basically the same, but the term motor starter implies that thermal protection for the motor is included. The contactors rated thermal current can be found by 8 hours duty. There are auxiliary switches available for the 3 pole and 4 pole dp contactors which can be snapped to the side of the contactor. Contactors are available with 12vdc, 24vdc, 48vdc and 115vdc. These sample contract templates are available in both word and excel formats. Here are a few of the basic differences that distinguish different types of relay and contactor switches. A contactor is a relay which is capable of switching large electrical loads contactors and relays are operated by applying a voltage to the coil of an electromagnet, which will cause a switch, or several switches to close.
Repco offers a comprehensive line of quality electrical contacts for asea brown boveri abb contactors. Weve sent you a message containing a confirmation link. This article is part of wikiproject electronics, an attempt to provide a standard approach to writing articles about electronics on wikipedia. Working of relays a contactor is also a type of relay. 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 without singlephase. In most cases, the contactor does not simply wear out from normal use.
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