The basics of contactors commercial electric products. French gerleman we understand you want a distributor who offers more than just products and parts. External contaminants on the surface of the contactor magnets can cause the contactor to buzz or hum at. Semantics the differentiation between a relay and a contactor is a subject often debated in some engineering circles. Perhaps the most common industrial use for contactors is the control of electric motors.
Sirius 3rh2 contactor relays with extended operating range. A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24volt coil electromagnet controlling a 230volt motor switch. An exclusive din track mounting option may reduce installation costs. Features of contactors a contactor is a relay that is used for switching power. Electrical contractors provide services that keep our lives. Repco offers a comprehensive line of quality electrical contacts for asea brown boveri abb contactors.
Factors of contactors contact design electrical technology. Although they have been explained in earlier posts, their wide use and significance needs to be explained in detail. Af09 af38 4pole contactors ac dc operated with screw. They can be designed to operate at voltages similar to the control devices that control their state or they can be designed to operate at. The three categories differ in the type of work each electrician performs. Contactors are essentially switches that can be controlled remotely.
Contactors and thermal overload relays conform to the iec standard. They can be designed to operate at voltages similar to the control devices that control their state or they can be designed to operate at voltages similar to the loads that they control. Size 5 contactors, as well as size 6 and size 7 contactors, with normallyopen no poles have a sin gle coil. 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. Were industry experts offering logistical and technical services that help you improve your. They act as a gobetween for direct power sources, and highload. 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. Shop for definite purpose contactors from platt electric supply. The contactors are higher level devices often used with high currents in the range 5 ams tp 500 amps or more. In most cases, the contactor does not simply wear out from normal use. What we need to look at briefly is the operation of the contactor.
Definite purpose contactors definite purpose contactors definite purpose contactors are ideal for heating, air conditioning, refrigeration, data processing and food service equipment. After completing this course, participants should be able to describe the operating principles of magnetic contactors and relays, and explain how both types of devices are used in electrical systems. Figure 1 electrical contactor figure 2 plugin relay. Though their output is used for switching very high loads, they are controlled by a circuit with very less power.
Misunderstandings are rampant in construction work between the contractor and the client so it is advisable to agree on a watertight construction contract. 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. Contactors contactors and reversing contactors types lc p k and lp p k 1 for mains supplies with a high level of interference voltage surge 800 v, use a suppressor module la4ke1fc 50 129 v or. Magnetic contactors are a form of electrical relay found on most electrically powered motors. An electrical relay used to control the flow of power in a circuit. However, like any other device, they are not infallible.
Industrial control and systems controllers, contactors and. Contactor definition of contactor by the free dictionary. Our k3 series compact and iec style contactors offer maximum. Control circuit characteristics contactor type lc1 lc2 lc7 lc8 lp1 lp2. Switches pilot lights signaling lights relays sockets timers contactors terminal blocks circuit breakers contactors 884.
They usually handle very heavy loads like an electric motor, lighting and heating equipments and so on. The armature hinges on aknite edge beadng which requires little main tenance. Contactors definition of contactors by the free dictionary. For requirements according to iec 600771 and iec 600772. Construction types definitions type iafire resistive noncombustible commonly found in highrise buildings and group i occupancies.
When the contactor operates there is no mechanical overlap between. Our k3 series compact and iec style contactors offer maximum performance with a minimal footprint. Apr 05, 2010 one of the main complaints about dp contactors in general is noise. They can be used to interrupt high voltage, capacitive, resistive or inductive loads without. The contactors are of unit construction with all rts assembled on a common frame.
Drive contactors type eflg, eh, ehdb drive contactor, general purpose type eg, type aafaetae, and type b contactor. They act as a gobetween for direct power sources, and highload electrical motors in order to homogenize or balance out changes in electrical frequency which may come from a power supply as well. Many construction projects require the work of all three types of electrical contractors. Contactor definition of contactor by merriamwebster. The following contactor series are supplied by repco. Contactors can be combined with either manual motor starters of the sm series, providing thermal and magnetic. One of the main complaints about dp contactors in general is noise. This manual is intruduces the types, characteristics, functions and offers product selection advice for lsiss metasol. Contactors synonyms, contactors pronunciation, contactors translation, english dictionary definition of contactors. This type of construction in which the building elements listed in ibc table 601 are of noncombustible materials, such as concrete. Possibility of direct connection of the br 6 bimetal relay for protection against overload and in case of phase failure.
Contactors electromechanical relays electronics textbook. New compact 1 and 2pole contactors are available along with full size 2, 3 and 4pole devices. Ax41 auxiliary contact units and ccu41 surge suppressor blocks are designed in order to match miniature version of contactors ex9cs or ex9csr. 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. Contactors and contactor relays with ring tongue terminals. Contactors and contactor assemblies digital asset management. Electrical contractors provide services that keep our lives running smoothly. The physical size of contactors ranges from a device small enough to pick up with one hand, to large devices approximately a meter yard on a side. Contactors have features that distinguish it from a standard relay.
In the last post i took the control circuit through to the contactor coil for the purpose of fault finding. Negotiating the contract type and negotiating prices are closely related and should be considered together. Auxiliary contact modules snap on either side of the type dpa contactors. Contactors and relays is a course designed to familiarize participants with the operation and use of magnetic contactors and relays. The basics of contactors contactors are useful in commercial and industrial applications, particularly for controlling large lighting loads and motors. Factors of contactors contact design the following factors consider while designing the contactors contacts relay, magnetic and electrical contactor. Unlike generalpurpose relays, contactors are designed to be directly connected to high. The objective is to negotiate a contract type and price or estimated cost and fee that will result in reasonable contractor risk and provide the contractor with the greatest incentive for efficient and economical performance. Mar 30, 2014 contactors with correct rating enures long life for the operation. Fourpole contactors, 25 to 125a in ac1 duty power factor correction contactors, 7.
A lump sum contract or a stipulated sum contract will require that the contractor agree to provide specified services for a stipulated or fixed price. Contactor definition is a device for repeatedly establishing and interrupting an electric power circuit under normal conditions. 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. Contactors contactors and reversing contactors types lc p k and lp p k 1 for mains supplies with a high level of interference voltage surge 800 v, use a suppressor module la4ke1fc 50 129 v or lafke1ug 250 v, see page 238. Inside electrical contractors work within the interior of a house or building and outside along the perimeter of the structure. Ac dc compatible coil, reversing contactors tesys d green. Notice and disclaimer the information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Types of construction type i this concrete and steel structure, called fire resistive when first built at the turn of the century, is supposed to confine a fire by its construction. 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.
Notice and disclaimer the information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was. Noark dp contactors provide high performance with both flexibility and reliability. The dila and dilm7 to dilm38 contactors of the dilaxhir22 auxiliary contact are available specially for switching the smallest signals for electronic. The physical size of contactors ranges from a device small enough to pick. They are designed to match numerous applications including. Contactors range from those having a breaking current of several amperes to thousands of amperes and 24 v dc to many kilovolts. For all intent purposes, a contactor is a relay, as shown in figure 2. After completing this course, participants should be able to describe. Coils can be changed quickly, without a tool, on the type dpa, 5090 a contactors.