Electrical standards for contactors ac1, ac2, ac3, ac4, dc1, dc2 dc3. The same is true when someone uses a normal operation motor contactor for motor jogging duty. A heating element is a classic example of a resistive load, and tends to be a fairly benign one for any contactor. They are environmentally friendly, versatile, and flexible. Complete order code with coil voltage digit or with voltage digit followed by 60 if 60hz. The thermal overload is supplied as a separate item. For three phase resistive heating applications, zerocrossing three phase ssrs are commonly used. Typical illustration of a threewire control installation. Contactors and contactor assemblies digital asset management. Contact ratings have to do with the main circuit being switched by the contactor. Nema contactor and starter specifications technical data.
Types of electromagnets relays are classified into the following types, depending on whether or not they have a permanent magnet. Types of relays there are different ways to classify relays. All contactors, thermal overload relays, and auxiliary contact blocks bear the ce mark. Motor logictm solid state, tesys t communicating solid state, adapted bimetal, adapted tesystm solid state and melting alloy types. Soon, manual contactors replaced knife blade switches completely, and even today different variations of these types of contactors are being used. Usually, the reason for contactor failure is misapplication. Sizes 002 contactors use a class 9999 sx11 auxiliary contact as the holding circuit contact. A normally open holding circuit contact for three wire control is provided on all contactors as standard. Thats why you need to understand the basics of contactors.
A contactor is a relay that is used for switching power. If you wire this side to the battery the contactor will not work. Variations of manual contactors are still in use today. Every 3 phase contactor has 3 poles, one for each phase, while every single phase contactor has either 1 or 2 poles please see switch terminology. Nemarated contactors motor starters are generally more rugged than iecrated units. A modern building requires the expertise of dozens of different contractors to see it through to completion. 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. Typically applied for switching large blocks of lights at the panelboard these types of lighting contactors can have ratings from 30225 a. Three phase, 480 volt ac power comes into the three normallyopen contacts at the top of the contactor via screw terminals labeled l1, l2, and l3 the l2 terminal is hidden behind a squareshaped snubber circuit connected across the contactor s coil terminals. Enclosures are made of insulating materials such as bakelite, nylon 6, and.
Simple catalog numbering for easy and fast ordering flexible with five overload relays. Auxiliary contact block types lszd can be snapped on contac tors lsdd. An electrical contactor is a switching device, widely used for the switching of motors, capacitors for power factor correction and lights. Cslb descrition of classifications 4 california contractors state license board c7 low voltage systems a communication and low voltage systems contractor installs, services and maintains all types of communication and low voltage systems which are energy limited and do not exceed 91 volts. Holding circuit contact a normally open holding circuit contact for three wire control is provided on all contactors as standard. Contactors and relays contactor relays eaton wiring manual 0611 5 3 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. Apr 29, 2018 the three types of circuits that a contactor might face are predominantly resistive, capacitive or inductive in nature real circuits have all three qualities, but one does tend to dominate. Our nema contactors are known for rugged construction, dependable performance, and long electrical life. For more information on machine safety applications using tesys d and tesys f contactors, refer to catalog mkted208051enus. Contactor construction, working principle, application. Battery contactor power in from battery power out to control unit or main bus wire to vp100200 control unit j5 pin 5 or to master switch. Contactors are most commonly used for controlling electric motors. First, remember that contactors are switching devices, so you will need to familiarize yourself with some of the selection factors for electrical switches. To complement the contactors, thermal overloads are offered for each frame size, available in several setting ranges.
In semiconductor testing, contactor can also refer to the specialized socket that connects the. Although they have been explained in earlier posts, their wide use and significance needs to be explained in detail. Many devices called relays use similar techniques and topologies. The contacts are the currentcarrying part of the contactor. A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. Tesys iec contactors and starters steven engineering. Relays and contactors use a variety of technologies to switch signals and power connections.
The starter design consists of three contactors, an overload relay and a timer for setting the time in star connection to delta connection. Motor starters and contactorslo w v o ltag e eaton. Our motorrated contactors are available from nema size 009, in open and enclosed design for fullvoltage starting of ac motors. Contactors are used by electrical equipment that is frequently turned off and on opening and closing the circuit, such as lights, heaters, and motors. These relays are constructed with electrical, mechanical and magnetic. This is yet another important component of this electrical device. Mar, 2015 in this lesson well introduce the contactor, the principal interaction point between the control and power aspect of an electrically controlled system using motors. C contactor a three phase starter b singlephase starter type 25 nonreversing contactors and starters c306 27 nonreversing starters xtob 30 nonreversing starters c440 eol 65 reversing contactors c 2 5 d n a 2 1 5 a a 1 6 1 8 4 contactor frame size a compact, singlepole. While many individuals have skills in different areas, union regulations often prevent them from working in more than one field. When this post is grounded the contactor is closed. 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 1phase, size 00 to 3 43 2phase and 3 phase, size 00 to 5 44 3 phase, size 6 45 3 phase, size 7 46 3.
Encapsulated dual voltage frequency magnet coils permanently marked with voltage, frequency and part number. A contactor can stand on its own as a power control device, or as part of a starter. 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. The enclosure is a frame housing the contacts and the electromagnet. Ul listed for usa and canada, file e93602 except for bfp09 which is ul recognized for usa and canada, file e93602, with 300v rating maximum. A6 iec contactors relays a6 springer controls company 96074 chester road, yulee, fl 32097 904 2250575 fax. Local manual operation of the complete starter group is also. This is star mode running 230 volts per winding see fig 4. Three types are presently available, differing primarily in method of producing the composite metal. M contactors m mini contactors mini contactors abb mini contactors abb m contactors abb m mini contactors 3pole contactors 3pole mini contactors abb 3pole contactors abb 3pole mini contactors performancedimension optimized mini. Contactors, overloads and manual motor starters carlo gavazzi. This includes power contacts, auxiliary contacts, and contact springs. These configurations and current rating in each configuration ensures that each customer requirement is satisfied.
Electrical standards for contactors ac1, ac2, ac3, ac4. The basics of contactors contactors are useful in commercial and industrial applications, particularly for controlling large lighting loads and motors. Bf50bf95 types are also csa certified, file lr 543321 and lr 5433226. The product offering starts with mini contactors in a compact 12 amp frame.
Ac 5060hz 024 048 110 230 400v ac 60hz 024 60 048 60 120 60 220 60 230 60 460 60 575 60 v. Selection of protection devices for motor feeders and type 2 coordination. Threephase, 480 volt ac power comes into the three normallyopen contacts at the top of the contactor via screw terminals labeled l1, l2, and l3 the l2 terminal is hidden behind a squareshaped snubber circuit connected across the contactors coil terminals. They usually handle very heavy loads like an electric motor, lighting and heating equipments and so on. Effective coordination of the activities of different trades is the. The duty of electrical contractor is categorized by the types of electrical loads used such as inductive, or resistive or capacitive and duty cycle such as plugging or runtime breaking, short circuit breaking etc. Typical illustration of a three wire control installation. The power circuit is engaged once the manual controller is activated by an operator. For starting, star connection used for normal run delta connection used in the motor windings.
The nema selection process always results in a choice of a contactor you can use over a broad range of operating conditions. Tesys f 3 pole contactors suitable for motor control up to a and power switching up to 2600 a. Three phase ssrs are intended to control three phase ac loads, which might otherwise be switched by electromechanical relays, contactors or three phase mercury relays or contactors. We offer a wide array of products with applications across many industries. Ac and dc contactor system dilm, contactor relays, 3 pole contactors up to. The basics of contactors commercial electric products. Motor protection concepts and type 2 coordination charts. Directonline dol motor starter description the direct on line motor starter dol is designed to switch a single or three phase induction motor at rated voltage. Types of relaysoverload protection relay,solid state. The following main utilization categories are the most common ones. It comprises an enclosure in steel or plastic, a contactor, start contact, link wires and stop start buttons. Contactor overvoltage damping sirius controls page 512 cdfeiii003v20en 3 types of protective circuits 3.
Both match a contactor with the job it has to do, but they do so in different ways. Contactors come in many forms with varying capacities and features. When someone uses a lighting contactor in a motor application, thats a misapplication. Contactors threepole contactors with ac control circuit 2. As contactors 3pole contactors and overload relays for. Type s contactors are designed for operation at 600 volts, ac 5060 hertz.
Two typical manual contactors still in use today engineers eventually made a breakthrough with the magnetic contactor. Service at the right time will avoid these kind of problems. An mcb or miniature circuit breaker is an electromagnetic device that embodies complete enclosure in a molded insulating material. Magnetic contactor the magnetic contactor does not require human intervention and operates electromechanically.
We offer a full line of versatile and robust contactors for both iec and nema applications. We also offer a variety of nema contactors with marine certification for many marine and offshore applications. Three contactor systems are often specified with a three position selector switch vfdtestbypass. Contactors are used in applications ranging from the light switch to the most complex, automated industrial equipment. There are various types of contactors, and each type has its own set of.
Model c contactor a threephase starter b singlephase starter type. In this method, the motor should be connected in delta for the normal run. A n 1 9 a n 0 a 5e 005 device type a starter c contactor contactor. Abb two contactor bypass systems can perform all three modes of operation without the three position switch, third contactor and associated wiring. Vfd mode and bypass mode, as they imply, power the motor through one of the two parallel paths.
Tesys f is a range of high current contactors from 115 a to a designed for ac 3 applications and from 200 a to 2600 a for ac1 applications. This type of transformer is categorized on the basis of a number of turns in the primary and secondary windings and the induced emf. As the name indicates contactor is used to make or break contacts as like an ordinary onoff switch. Gray cover, no accessibility, with manual only nib. Contactors three pole contactors with ac control circuit 2. Easy to combine with manual motor starters by using adapter and. However, like any other device, they are not infallible. Premature service on contactors will increase the overall cost while delayed service could cause costly interruptions or breakdowns. There are various types of contactors, and each type has its own set of features, capabilities, and applications. Our contactors can also be used for nonmotor and lighting loads. A contactor is controlled by a circuit which has a much lower power level than the switched circuit.
Integrated building systems contractors integrated building systems ibs electricians also called voicedatavideo electrical vdv contractors primarily work with technologies that make houses and offices functional abodes and workspaces. Types of transformer different types of transformer. Additionally, there are three general things to consider for selecting contactors in particular. Nonpolarized relays nonpolarized relays do not use a permanent magnet in their. Whatever the application, the function of the contactor is always the same. This is one of the most advanced designs of a contactor, which can be operated remotely. The manual contactor was a big improvement over the knife blade switch. When selecting contactors, youll use one of two common standards. The largescale revamp calls for the coordinated skills of all three types of electrical contractors.
Manual guidelines for contactor inspection and maintenance. Solutions are available for every application like motor starter, agriculture pumps, genset applications, street. Direct control by plc removing any use of interface relay and reducing panel power consumption. Contactors electromechanical relays electronics textbook. Different types of relays used in protection system and. 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. Sizes 3 7 contactors use a class 9999 sx6 auxiliary contact as the holding circuit contact. In one type, molten welding permanently bonds the two components.
The following groupings will be used in this technical guide. Mcb miniature circuit breaker, construction, working, types. When the start button is pressed, contactor 1 and 3 will close. The main function of an mcb is to switch the circuit, i. Effective coordination of the activities of different trades is the responsibility of the general contractor, who works as a liaison between the client and the building activity. In most cases, the contactor does not simply wear out from normal use. From standard solutions to custom designs, we offer reliable, costeffective products for mechanical, electrical, digital, analog, miniature, and harsh environment.