Contactor crossreference 195 catalog 057102200 page 14 mcquay intl note. Magnetic contactor is different from relay and circuit breaker. Sc03 to scn3 smallframe contactors provide snapon fitting of numerous optional units, such as auxiliary contact blocks, coil. The magnetic drive adapts perfectly to this type of apparatus thanks to its precise and linear travel.
Magnetic contactor functions the magnetic field is generated by the electromagnet in the magnetic contractor when the electricity starts flowing in the magnetic contractor. Magnetic contactors and magnetic starters instruction manual magnetic contactors and magnetic starters nstruction manual to ensure proper use of the products listed in this catalog, please be. If the contactors are used to manage volts higher than volts, inert gases and also vacuum is used as frame housing. Umc magnetic contactor series employ a modular design which allows quick. An electrical contactor is a switching device, widely used for the switching of motors, capacitors for power factor correction and lights. Magnetic contactors use a small control current to open and close the circuit. Manual guidelines for contactor inspection and maintenance.
A normally closed nc contact completes the circuit between the fixed contacts and the moving contacts. Motorstarters are action devices that start and stop motors and provide overload protection. This manual is intruduces the types, characteristics, functions and offers product selection advice for lsiss metasol series. Usually, the reason for contactor failure is misapplication. It can also switch on and off the circuit, but its primary function is fault isolation. This means that the contactor can be operated remotely, without the need for putting a person in a potentially dangerous location. Magnetic contactors are a form of electrical relay found on most electrically powered motors. Contactors electromechanical relays electronics textbook.
Motor control centers are designed to meet the requirements of the national electrical code. Optional function unit can be easily added to modify contactor immediately on site. How a magnetic contacor works the function of a contactor or motor starter is simple, when the ac supply goes to the contactor coil, the coil make a strong magnetic field and field pulls the iron core to. What is magnetic contactor and how its works electrical. The sc series is a range of long servicelife and highperformance contactors. Thats why you need to understand the basics of contactors. 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 as to act as a safeguard. Contactors are electrically controlled switching devices used for. Hum can also occur if the pole surfaces are deformed. Main difference between contactor and starter electrical. The magnetic field created is a strong magnetic field that pulls the iron core of the magnetic contractor in the coil and as a result, an electric arc is generated. A magnetic starter is a device designed to provide power to electric motors. When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name. Auxiliary means helper or we can said these are helper contacts in magnetic contact or.
This includes power contacts, auxiliary contacts, and contact springs. Functions composite magnetic switch abbreviated as ms is comprised of a contactor for switching on and o. Motor control fundamentals wiki odesie by tech transfer. While the core of a motor starter is a contactor, its ability to provide overload protection is the trait which makes. Refer to appropriate page for contactor coil voltage. A guide of auxiliary contact s and its uses and working in contactor motor stater. Magnetic contactor the magnetic contactor does not require human intervention and operates electromechanically. If you see from the application point of view, you would have seen contactors placed in control panels of industrial motors. 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. This is one of the most advanced designs of a contactor, which can be operated.
A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24volt coil. The magnetic starter is very similar to the magnetic contactor in design and operation. What is is auxiliary contacts and its working in contactor. The hs series complies with the requirements for control functions for failures. Contactor construction, working principle, application. When current is passed through the contactor, the electromagnet starts to build up, producing a magnetic field. When someone uses a lighting contactor in a motor application, thats a misapplication. Each type of contact has an individual role to play.
Manual motor starters, contactors and overload relays pdf edition nov 2016 english pdf catalogue contactors for capacitor switching english pdf catalogue technical spec. This is the most common type of contactor used in industrial control applications. Fuji electric contactors catalog all world machinery. A magnetic contactor is operated electromechanically without manual intervention. The auxiliary circuit connects to an induction coil, and. They act as a gobetween for direct power sources, and highload. The excited electromagnet produces a magnetic field, causing the contactor core to move the armature. Contactor relays are often used in control and regulating functions. Both have the feature of operating contacts when the coil is.
What is the difference between a contactor and a relay. Both ondelay and interval functions are furnished on the electronic timer block. From this point forward, the term contactor will refer only to an ac magnetic contactor. Auxiliary contact block fits all size contactors03 to n3 snapon mechanical interlock unit can be fixed to equal or.
The use of blowout coils help in stretching and moving the electric arc. Magnetic contactor working principle in english how mc. Advanced motor protection and control fuji duo series. A manual starter is used frequently where the only control function needed is to start and stop the motor. If so the complete contactor needs to be exchanged.
A louder hum will occur if the shading coil does not apply to af is. As the name indicates contactor is used to make or break contacts as like an ordinary onoff switch. Mitsubishis magnetic contactors and magnetic starters. Contactors for capacitor switching motor protection and. The power source into the coil of winding,it like the solenoid operation. A louder hum will occur if the shading coil does not apply to af is broken because the magnet will cause the contactor to chatter. A contactor can stand on its own as a power control device, or as part of a starter. This video explains the principle of operation of contactors. The junction relay for opening and closing the low voltage and minute current is not needed, so this unit is suitable.
Rather, overload heaters are designed to thermally mimic the heating characteristic of the particular electric motor to be protected. Contactors are typically built for and used in 3phase applications where a relay is more commonly used in single phase applications. 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. The fc series contactors are compact and economical contactors designed for use in consumer. Your power is most critical to us and we are available 24x7. Magnetic contactor is common used in automation industry for motor control application. Magnetic contactors and starters general information. Small frame contactors with new functions join the sc series. Contactors and relays perform the same task of switching a circuit. Answer baljeet singh the contactor means the contact to make or break the circuit with useful protection. Magnet is based on an acinput, dcoperated concept, thus allowing the coil to be energized by both ac. Magnetic contactor is a switchgear device like a relay but it has the higher current capacity and hence has some extra use in power circuits.
A new contactor range from abb new generation abb contactors. It includes a contactor as an essential component, while also providing powercutoff, undervoltage, and overload protection. Vacuum contactors utilize vacuum bottle encapsulated contacts to suppress the arc. Magnetic contactors and magnetic starters instruction. The contacts are the currentcarrying part of the contactor. Contactors are used in applications ranging from the light switch to the most complex, automated. Magnetic contactors and magnetic starters exceed your expectations mitsubishis magnetic contactors and magnetic starters, continuously pushing the boundaries.