Magnetic contactor working principle in english how mc works with animation earth bondhon a contactor is an electrically controlled switch relay used. Its working principle can understand so, when the coil is energized, a static iron core generates electromagnetic force, will be moving iron core is attracted, because the contact system and the movable iron core linkage, the movable iron core drives the three movable contact piece run at the. 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. Rc suppressors free wheel diode suppressors varistor suppressors on the contactor relay dila the coil. There are many type of button as momentary switch, selector switch.
The power circuit is engaged once the manual controller is activated by an. Contactors are electrically controlled switching devices used for switching of e. The magnetic field then uses for opening and closing the switch and for performing the mechanical operation. The power source into the coil of winding,it like the solenoid operation. Magnetic drive pumps circulate a variety of fluids. The working principle of electromagnetic relays is not complicated, and it operates mainly according to the principle of electromagnetic induction.
The contactor may have arced and welded a contact or all contacts. The first three steps for selection will be the same. Push down the bridge at i until mechanically latched. Should all 3 contacts have welded in, the motor will most likely start the minute you turn power on. Thus the switch plays an important role in the relay working. This element uses for interface between machine and human or operator. Working of relayshow relay works,basics,design,construction.
You should hear an audible click, and a humming sound will emit from the contactor. The auxiliary circuit connects to an induction coil, and when current flows through the circuit, the coil generates a magnetic field. Hello,i have a 5hp, 380 volt,3 phase motor that bends reinforcing bars. In most cases, the contactor does not simply wear out from normal use. The enclosure is a frame housing the contacts and the electromagnet. In this post, you will find details about electromagnetic overload relay which is somewhat outdated nowadays, but still, some old air compressor units are having these types of relays.
What we need to look at briefly is the operation of the contactor. Working of relays a contactor is also a type of relay. Magnetic contactor working principle in english how mc. Magnetic contactor working principle in english how mc works with animation earth bondhon a contactor is an electrically controlled. Umc magnetic contactor series employ a modular design which allows quick and simple mounting of. Dualchannel recording dual dash camera with front and rear, 4 time higher than a regular full uhd recording, it is the highest quality possible at this time, which providing the most detail of license plates and road signs for driving. Magnetic contactor magnetic contactor working principle electrical engineering. Scribd is the worlds largest social reading and publishing site. Contactor relays eaton wiring manual 0611 54 5 5 coil connections on the top positioned terminals a1a2 of the contactor diler the following accessories are connected to limit the relay coil switch off breaking voltage peaks. Sep 16, 2016 magnetic contactor magnetic contactor working principle electrical engineering learning engineering september 16, 2016 magnetic contactor magnetic contactor working principle electrical engineering. When the start button is pressed in a magnetic starter, an electromagnet gets energized and the contactor gets engaged. Some contactors may have some form of visual aid or manual actuator that will physically move when the coil is energized. The sc series is a range of long servicelife and highperformance contactors. Although they have been explained in earlier posts, their wide use and significance needs to be explained.
The basics of contactors contactors are useful in commercial and industrial applications, particularly for controlling large lighting loads and motors. The control circuit is connected to any two phases and energized from them only. Hyundai innovative magnetic contactor overload relay. Overload relays are generally of two types one is electromagnetic overload relay and another is thermal overload relay. Sc03 to scn3 smallframe contactors provide snapon fitting of numerous optional units, such as auxiliary contact blocks, coil surge suppressors, and operation counters. A solenoid is similar to a motor because it uses a magnetic field to produce physical movement of the solenoid cylinderbut instead of spinning like a motor output shaft, the. If it welded one contact, it means you will have power to one set of the motor winding the minute power is turned on. How reed switches work magnetically operated switches. The basics of contactors commercial electric products. A guide of auxiliary contact s and its uses and working in contactor motor stater. Magnetic contactor working principle in english how mc works. Magnetic motor starters and magnetic contactors note this mark indicates ec directive compliance.
Maintenance of electromagnetic contactor on electric locomotive. Contactor construction, working principle, application an electrical contactor is a switching device, widely used for the switching of motors, capacitors for power factor correction and lights. Motor starters, contactors, and relays all operate on the same basic principle. However, like any other device, they are not infallible. A choice of fast magnetic or hydraulically delayed switching characteristics stype mo.
Magnetic contactor types directory find a magnetic contactor types. Magnetic contactor magnetic contactor working principle. A magnetic drive pump is a pump that is powered through the use of the science of magnetism rather than electricity from an outside source. The electromagnet or coil provides the driving force to close the contacts. The contacts are the currentcarrying part of the contactor. Find magnetic contactor related suppliers, manufacturers, products and specifications on globalspec a trusted source of magnetic contactor information. Magnetic contactor working principle in english how mc works with animation earth bondhon a contactor is an electrically controlled switch relay used for switching an electrical power circuit. The basics how capacitors work working principle duration.
Contactor for a threephase electric motor, installed on a panel as part of an electrical control system. A simple circuit diagram either of the two start buttons will close the contactor, either of the stop buttons will open the contactor. A remotecontrol circuit is any circuit which has as its load device the operating coil of a magnetic motor starter, a magnetic contactor, or a relay. As shown in the circuit, the current flowing through the coils represented by pins 1 and 3 causes a magnetic field to be aroused. Reliability himc magnetic contactor series employ a modular design which allows quick and simple mounting of auxiliary contact blocks, timers, mechanical latching blocks. Magnetic contactor is common used in automation industry for motor control application. Pdf magnetic contactor 1 pole relay wiring free files. Though their output is used for switching very high loads, they are controlled by a circuit with very less power. Magnetic 3pole application and amperage size coil type coil voltage builtin auxiliary bimetallic amperage size type setting ranges minicontactor.
I purchased this motor in auction and all the wires are missing and the contactor s are not working. Its intensity and direction determine the forces of attraction or repulsion existing between the two magnets. If the motor has not been started yet, the magnetic starter does not receive current. Himc contactor is available in both acdc and 50 hz 60 hz with an electronic circuit which enables operation through severe voltage drop. You can probably see now how a clamshell phone switches on and off when you open or close it. A contactor is an electricallycontrolled switch used for switching an electrical power circuit. When current passes through the electromagnet, a magnetic field is produced, which attracts the moving core of the contactor. Noise free compact design hi series hyundai innovative magnetic contactor overload relay innovative technology, high performance magnetic contactor strong silent small. Wide range of operating voltage 100240v, 265450v, 440575v, ease of. This magnetic field causes the closing of the pins 2 and 4. Switching on the power in the lowvoltage control circuit, the current goes through the coil of the electromagnet to generate a magnetic field. Magnetic contactors, magnetic starters fuji electric fa.
Quite a neat summary of how reed switches are used in practice, and the need to choose the right magnet to avoid the switch going on or off too many times. They usually handle very heavy loads like an electric motor, lighting and heating equipments and so on. The working principle of a dol starter begins with the connection to the 3phase main with the motor. Wide range of operating voltage 100240v, 265450v, 440575v, ease of customer use. A normally closed nc contact completes the circuit between the fixed contacts and the moving contacts.
What is is auxiliary contacts and its working in contactor. In semiconductor testing, contactor can also refer to the specialized socket that connects the device under test. A magnetic contactor has two incoming circuits which include the main circuit to power the load and an auxiliary circuit to operate the contactor itself. Download as ppt, pdf, txt or read online from scribd. They are detachable from a motor so that an operator may work with that motor. Contactors, overloads and manual motor starters minicontactors and overloads up to 20 amps or 7. With the acceleration of globalization in the powerreceiving and distribution equipment market, we offer various powerreceiving and distributing devices that can be used in crossborder markets through our wide range of products that conform to major standards in the world. Printed in the united states of america on acidfree paper. Internationalization compliant with iec, ce, ul, tuv worldwide standards. Himc contactors can be used in various environments by adopting special plasticcti600 v. This video explains the principle of operation of contactors. As you saw in the sketch of the control circuit, we followed the circuit. A contactor is controlled by a circuit which has a much lower power level than the switched circuit. There are posts on the working of relays, types of relays and so on.
Relay logic circuit rlc relay, contactor, switch and timer. In the last post i took the control circuit through to the contactor coil for the purpose of fault finding. Himc contactor maintains noise free operation through the dccontrol method. We are funded by cnbm group, a fortune 500 enterprise. Magnetic contactors are a form of electrical relay found on most electrically. Dc holding, absolutely free of electromagnetic noise. Fundamental relayoperating principles and characteristics 19 singlequantity relays of the electromagneticattraction type here we shall consider plungertype and attractedarmaturetype ac or dc relays that are actuated from either a single current or voltage source. How the contactor operates operating principle of a contactor. When we press the start button, the current flows through contactor coil magnetizing coil and control circuit also.
When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name. Note that one one of the contactor acts as a switch for the start button. Jun 26, 2019 introduction to reed switches, magnets and magnetic fields by stephen day. A contactor is a relay that is used for switching power. Magnetic drive pumps are energy efficient and require no seals or lubricants for operation. It can delivery a big ampere to the loads and very long lasting and high durability. This includes power contacts, auxiliary contacts, and contact springs. The excited electromagnet produces a magnetic field, causing the contactor core to move the armature. It has a normally closed reed switch in the lower part of its body where the keypad is and a magnet in the upper part where the screen is. 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. These relays are usually rated up to 10 or 15 amps. Products with the ce mark can be used for european destinations. Download magnetic contactor 1 pole relay wiring free files.
Shcet3 20 2p 20a 25a household modular contactor over and under voltage relay buy household ac contactor 2 pole contactor magnetic contactor product. In process industries, a contactor is a vessel where two streams interact, for example, air and liquid. What is direct online starter dol working principle pdf. Magnetic contactor free download as powerpoint presentation. A magnetic contactor works by creating a connection between the motor and the electromagnet. Electromagnetic relays are those relay which operates on the principle of electromagnetic attraction. The electric circuits derived from magnetic circuits using the principle of duality are employed to estimate. These contacts is directly proposal to the setting coil and when magnetic contactor coil energize and set. It is a type of a magnetic switch which uses the magnet for creating a magnetic field. A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. Contactor overview function contactors are designed to control 1p, 2p, 3p and 4p circuits up to 100 a. Contactors electromechanical relays electronics textbook. Relays a relay is an electrical switch that uses an electromagnetic solenoid to control the position of a mechanical power contactor. Mcgrawhills national electrical code 2011 handbook, 27th edition article 725.
Shown here is a contactor for a threephase electric motor, installed on a panel as part of an electrical control system at a municipal water treatment plant. Magnetic contactor wiring diagram pdf teknik listrik. Magnetic contactor magnetic contactor working principle electrical engineering learning engineering september 16, 2016. Enclosures are made of insulating materials such as bakelite, nylon 6, and. The current passing through the contactor excites the electromagnet.
A magnetic contactor may be present in a magnetic starter as either stationary or moving, together with a solenoid coil, pressure springs, an electromagnet that is kept in place, magnetic shading coils and a mobile armature. Were selling magnetic contactor for only 1200 per kg. Jul 17, 2017 energize the contactor s coil by turning the control switch to the on position. As the name indicates contactor is used to make or break contacts as like an ordinary onoff switch. Sometimes called ice cube relays because they are small and square and with clear plastic like an ice cube. 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.
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