Relays and contactors pdf

These relays are also called as directional relays. More specifically, circuit breakers and fuses are designed to detect when there is too much current in the circuit, while overload relays are designed to detect if a motor is overheating and will open the circuit if the motor gets too hot. Monitoring relays monitor a system conditions such as direction of power and accordingly generates an alarm. Possible to print the page to a pdf file or from your printer. A contactor is an electrical device which is used for switching an electrical circuit on or off.

They are environmentally friendly, versatile, and flexible. The typical symptom is random tack welding of the normallyopen contacts when switching an inductive load or a lamp load with high inrush. Our line includes products from agastat, axicom, cii, hartman, kilovac, oeg, potter and brumfield, products unlimited, and schrack, as well as te. Part 4 overload relays part 5 dc general purpose constant voltage controllers part 6 ac combination motor controllers part 7 magnetic lighting contactors part 8 disconnect devices for use in industrial contr ol equipment annex a maintenance of motor controllers after a fault condition. Ls contactors metasol series contactors ls australia.

Xt iec contactors are suitable for global use and cover the entire output range, from mini contactor relays up to 7 a all the way to vacuum contactors up to 3180 a. All moeller contactor relays have doublebreak contacts. Sometimes called ice cube relays because they are small and square and with clear plastic like an ice cube. Ribu1c enclosed relay 10 amp spdt with 1030 vacdc 120 vac coil ribh1c enclosed relay 10 amp spdt with 1030 vacdc 208277 vac coil ribu1crd ribh1crd red housing ribu1cn4 ribh1cn4 nema 4x housing, ul508 only 10 amp pilot control relays specifications made in usa meets buy american of arra 2009. 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. They are used in large quantities for the indirect. Much like a relay, a contactor is an electrically controlled switch. Iec contactors relays a2 springer controls company 96074 chester road, yulee, fl 32097 904 2250575 fax. Af contactors 3pole contactors and overload relays for. Both of them are electrically operated switches used for control and switching of loads. Both these devices are used for similar purposes and hence people are often confused about the difference between a contactor and a relay.

Contactors and contactor relays to keep things running you need control abb offers a comprehensive selection of contactors for simple and extreme application as well as products with specific purposes. Many devices called relays use similar techniques and topologies, but the terminology can be confusing. Industrial control and systems controllers, contactors and. Gigavac is a leading designer, manufacturer, and worldwide seller of contactors, manual battery disconnect switches, and high voltage relays using vacuum, gas filled, and high voltage reed relay technology. This p roduces a retarding effect on motion of the rotor in either di rection.

A contactor is a large relay, usually used to switch current to an electric motor or another highpower load. Fused control circuit transformer and control relay. The employers liability insurance association demands that, for control systems of powerdriven metalwork. Contactors up to 150 a for ac3 75 kw 400 v and 200 a for ac1 applications. Contactors, and relays for hvac are available at wholesale and quantity pricing. Relays a relay is defined as an electrically controlled device that opens and closes electrical contacts, or activates and deactivates operation of other devices in the same or another electrical circuit. On the other hand, relays are low cost devices when compared to contactors. Generally, the need for proper coil drive applies equally to contactors and telecommunications relays except that increased internal and coil temperature rise due to contact load is seldom an issue in telecommunications applications. The rib relay in a box pilot series includes ribu1c, ribu2c, ribh1c, ribh2c, ribh1s and more has 10a relay contacts and is used to control light electrical loads, dirve power relays or contactors, or sense the voltage being fed to electrical loads. Electrical endurance of main contacts of motor contactors. The components are aiming for spacesaving, flexibility, convenience and easy wiring, installation through various accessories.

Make the most of your energy sm tesys iec contactors and overload relays making highfault shortcircuit current ratings simple the latest development in the tesys family of iec contactors and overload relays is component highfault shortcircuit current ratings sccrs. To complement the contactors, thermal overloads are offered for each frame size, available in several setting ranges. Abb 3pole contactors offer an exhaustive selection of products for simple and extreme applications as well as products with specific purposes. The relays come mounted and prewired in a housing, saving the installer the time, trouble and expense of buying separate components relay, socket, mounting rail, and enclosure and. Breakdown voltages volt amperes coil voltage rating all terminals 60 hz rms contact material electrical life mechanical life open max. Contactors and protection relays schneider electric. The safety cover of magnetic contactor and thermal overload relay is optional. Jun 18, 2018 since relays arent designed for high loads, arcing is less of a concern and arc suppression is much less common on relays. The first three steps for selection will be the same. 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. Two types of relay technology are available, mechanical and solid state. In particular, large electrical gear as generators, motors and.

We constantly seek innovative ways to provide solutions for our global customers. Directly mountable overload relays provided separately. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. Safety features overloads 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 1030seconds. Perhaps the most common industrial use for contactors is the control of electric motors. Enclosed control options include metallic and nonmetallic enclosures with circuit breakers, and north american or european fuses. Designed for a variety of applications, including iec and nema, they can control single or multiple circuits with different voltages, and are fully. The xt iec series includes nonreversing and reversing contactors and starters as well as overload relays and accessories. Our products are crafted with precision and tested rigorously for performance far exceeding industry standards. Solidstate relays and contactors 8 industrial controls product catalog 2017 section contents introduction 82 solidstate switching devices general data 83 solidstate switching devices for resistive loads solidstate relays 3rf21 solidstate relays, singlephase, 22. Contactors, overloads and manual motor starters carlo gavazzi.

Contactors electromechanical relays electronics textbook. Ac and dc contactor system dilm, contactor relays, 3 pole contactors up to 170 a ac3 at 400 v, 4 pole contactors up to 200 a ac1. Contactors and protection relays explore tesys, a range of contactors and protection relays also known as electromagnetic switches offering bestinclass safety for your motor control solutions. Relay locations relays are located throughout the entire vehicle. 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. Also find hard to find transformers, contactors, and relay replacement parts. One of the currentcarrying parts of a relay, switch or connector that is engaged or disengaged to open or close the associated electrical circuits.

Understanding relays page 2 autoshop, all rights reserved. Abb offers a comprehensive selection of contactors for simple and extreme application as well as products with specific purposes. 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. Apart from optional auxiliary lowcurrent contacts, contactors are almost exclusively fitted with normally open form a contacts. A mercurywetted relay is a form of relay, usually a reed relay, in which the contacts are wetted with mercury. For example, an overload relay can trip without a circuit breaker tripping. A contactor is used for switching of motors, capacitors, lights etc, that drains very high current.

How to do contactor wiring for 3 phase induction motor with 3 pole circuit breaker overload relay nonc push button switches in this tutorial post i will tell you about motor contactor wiring and its diagram. Many devices called relays use similar techniques and. Today it makes over 12,500 different products, including step relays, light dependent relays and other products for residential and commercial applications. Motor starters, contactors, and relays all operate on the same basic principle. Unlike relays, contactors are designed with features to control and suppress the arc produced when interrupting heavy motor currents.

Relays are typically integrated into a logic circuit together with other relays. By design and construction they ensure electrical isolation between the actuating circuit and the operating circuit, in the deenergized state, between the contact input and output. If one set of contacts in the relay becomes immobilized, no other contact of the same relay will be able to move. Contactor relays are often used in control and regulating functions. Many devices called relays use similar techniques and topologies. This means that with a contactor, when it is deenergized there is typically no connection. Control and chapterb11 tesys p c rotection omponents from 0. All dil contactor relays have doublebreak contacts.

This document explains each and every relay and its working principle with appropriate figures. Similarly, little is specifically mentioned regarding application of telecommunications type relays. Contactors come in many forms with varying capacities and features. We offer the broadest range of relays and contactors in the world.

The af contactor technology revolutionizes how we use contactors and allows use in all parts of the world and in all network conditions. Relays on the other hand can and often are both normally open andor normally closed depending on the desired function. Hv relay and contactor information with cross reference charts for kilovac te connectivity, jennings, kissling, and cyneryg3 part numbers. Our nema contactors are known for rugged construction, dependable performance, and. In general contactors are intended to control higher levels of current. A wiring diagram is a simplified conventional pictorial representation of an electric circuit. Electrical endurance of contactor relays and auxiliary contacts of motor contactors.

The more expensive the electrical gear, the greater the number of relays that will generally be used. The relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. Difference between contactor and relay compare the. Only some of the relays are explained in this document for making it simple and understandable. Dec 11, 2017 much like a relay, a contactor is an electrically controlled switch. Difference between contactors and relays electrical classroom. If the seriesconnected heaters get too hot from excessive current. Relays and contactors use a variety of technologies to switch signals and power connections. Thermal overload relays for use with tesys k contactors type of product range pages adjustable thermal overload relays for motors tesys lrk from 0.

The xt iec contactors are powerful, efficient and versatile, and can be combined with our full range of electronic overload relays and bimetal relays. Contactors are almost exclusively designed to operate with normally open form a contacts. Threepole contactors to 2000a fourpole contactors to 200a capacitor contactors to 680 kvar mini contactors to 9a relays to 16a thermal overload relays to 630a. They both are commonly used in industrial and commercial applications, and function in almost the exact same way. Rather, the term, contactor is used to describe a type of device that is used very much in the same manner as a relay. Sirius 3ru thermal overload relays sirius 3rb electronic overload relays manual, 122017, a5e03656507420arsac004 9 introduction 1 1. Contactors are comparatively high cost devices when compared to relays. Featuring a conveniently compact size, a mechanical life rated at 10 million operations, and an electrical life ac3 rated in excess of 1 million operations at rated current. Select the relay design and choose a semiconductor relay with higher rated current than the load requires determine the thermal resistance of the proposed heat sink c heck the correct relay size with the aid of the diagram solidstate contactors dlfor switching motors the solidstate contactors for switching motors are intended for. Xt iec overload relays contactors and starters eaton. They are used in large quantities for the indirect control of motors, valves, clutches and heating equipment. Solidstate relays and contactors 8 industrial controls product catalog 2019 section contents introduction 82 solidstate switching devices general data 83 solidstate switching devices for resistive loads solidstate relays 3rf21 solidstate relays, singlephase, 22. The contactor relay contacts themselves constitute a considerable safety feature.

These relays are usually rated up to 10 or 15 amps. They both are commonly used in industrial and commercial applications, and function in almost the. Shop our parts hvac online store for transformers, contactors, and relays hvac supplies and accessories. Contactors and control relays may be conveniently mounted using a 35mm din rail or by affixing with screws to a base plate. It has at least a single pair of threephase input and output contacts. Contactors and relays contactor relays moeller wiring manual 0205 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. 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. Contactor and relay are two terms often encountered when dealing with electric circuits. This application note has been written in response to the numerous application problems resulting from improper relay coil suppression. Contactors, relays, starters contactors d59 magnetic starter stardelta starter thermal relay currentlimiting contact assembly ac contactor for capacitor switching auxiliary contact assembly timedelay block 5. Continuous current ratings for common contactors range from 10 amps to several hundred amps. Since 1954, when it was founded, finder has concentrated its efforts on the manufacture of quality products.

Thermal overload relays for tesys d contactors class 10 a. Wiring diagram book a1 15 b1 b2 16 18 b3 a2 b1 b3 15 supply voltage 16 18 l m h 2 levels b2 l1 f u 1 460 v f u 2 l2 l3 gnd h1 h3 h2 h4 f u 3 x1a f u 4 f u 5 x2a r. Contactors and relays are two closely related terms leading to confusions and misinterpretations most of the times. Afs contactors is part of the abb safety family, and selected sizes are tested together with abbs pluto safety plc and the sentry safety relay. Save space and engineering design time with xt iec series overload relays.

Large electric motors can be protected from overcurrent damage through the use of overload heaters and overload contacts. Other uses include general purpose switching in appliances, fan controls, and vending machines. Highcurrent contacts are made with alloys containing silver. Relays are typically integrated into a logic circuit together with other relays and. Hope that you will get a good idea on this topic once you start reading this information. 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. Relays 2pole air conditioning relays the mars series 903 switching relays are intended for many applications in air conditioning, refrigeration, and heat ing. Ls contactors ls control components are suitable for switching, protecting and starting motors and plants. The functional devices rib relay in a box pilot series controls most building automation systems, bas, hvac, lowhorsepower motor and lighting applications. There are other types of relays are also use in different application in electrical industry such as protective relays, solid state relays. Catalog afs contactors dedicated for safety applications. A mercury relay, sometimes called a mercury displacement relay, or, mercury contactor, is a relay that uses the liquid metal mercury in an insulated sealed container as the switching element. The basic principle of operation of the contactor and the relay are the same.

Relays have small electromagnets when compared to the relatively large electromagnets of contactors and in this regard, contactors consume more power than relays. Pdf english application of relay coil suppression with dc relays. Relays and contactors type 91 general purpose relays type engineering design data magnet coil rating operation in % nom. When a relay is used to switch a large amount of electrical power. A contactor is a heavyduty relay with higher current ratings, used for switching electric motors and lighting loads.