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    40 amp 4 pole Lighting Contactor, 110V/220V Coil

    $74.36
    SKU: ATO-LCON-40
    40 amp lighting contactor with 2 operation modes for sale online, magnetic contactor has 100,000 cycles, coil voltage 220V/110V AC, selectable contactor auxiliary contacts. it pperates at a safer load, optimizes the electromagnetic system to reduce the maintenance power, and provides reliable and convenient lighting control.

    50 amp 4 pole Lighting Contactor, 110V/220V Coil

    $78.23
    SKU: ATO-LCON-50
    High performance 50 amp lighting contactor at low price, contactor modular with 220V/110V AC coil voltage, 100,000 cycles, 2 operation modes. 4 pole contactor for ac unit with auxiliary contacts operates at a safer load to control lighting systems for household appliances, industrial and commercial.

    500A DC Contactor, single pole, 12V/24V/48V

    $205.63
    SKU: ATO-DCCON-C500
    500A high current contactor with single pole, designed for direct current loads, IP 50 protection, good quality and long life. They are available with two optional auxiliary contacts, 2A/48V DC or 5A/24V DC.

    600A DC Contactor, single pole, 12V/24V/48V

    $185.32
    SKU: ATO-DCCON-C600
    High current contactor, designed for DC loads, contact circuit rated load current is 600A, one normally open contact which has excellent conductivity. Single pole contactor, cheap price and manufacturer direct sale.

    63 amp 4 pole Lighting Contactor, 110V/220V Coil

    $82.47
    SKU: ATO-LCON-63
    Buy a low price 60 amp lighting contactor online. 4 pole contactor has coil voltage 220V/110V AC, 100,000 cycles, low noise and long life, ac contactor with auxiliary contacts works at safer load, and offers reliable and convenient lighting control, supplies for home appliances, large-scale industrial and commercial.

    800A DC Contactor, 12V/24V/48V

    $123.69
    SKU: ATO-DCCON-C800
    It is a DC contactor with high current, normally open contact type and a rated load current of the contact circuit of 800A. The voltage options include 12V, 24V, 48V, etc. This 800A DC contactor is made of the same material, has good conductivity, sensitive response, low price and guaranteed quality.

    9 Amps 3 Pole AC contactor 24V/110V/220V Coil

    $48.90
    SKU: ATO-ACCON-009
    9 amps 3 pole AC contactor, available with 24V, 110V, 220V coil voltage. It mainly applies to the circuit of AC 50Hz/60Hz, and rated insulation voltage 660V. The rated current is 9A when used at 380V and 7A at 660V, for long distance breaking circuit and frequently starting or control the motor. This bypass contactor frequently start and control AC electromotor.

    9A Star Delta Starter, 4kW/ 7.5kW, 220V/ 380V AC

    $89.99
    SKU: ATO-STAR-09
    Compact size 9A starting current star delta starter for sale. It has short circuit protection, overload protection, missing phase protection and other functions. Y delta motor connection starter at low price consists of 3 contactors and an air delay head for three phase electric induction motor circuit control, contact form 3P+NO or 3P+NC, working at 4kW/ 7.5kW power, 220V or 380V AC voltage.

    100 amp 2/4 pole Lighting Contactor, 110V/220V Coil

    $86.84
    SKU: ATO-LCON-100
    Low cost 100 amp 4 pole lighting contactor is a relay switch, 2 pole contactor is also available with 100,000 cycles, 220V/110V AC coil voltage, and 2NO auxiliary contact. Full-automatic AC contactor optimizes the electromagnetic system to reduce the maintenance power, used to control lighting systems for home appliances, industrial and commercial.

    1000A DC Contactor, 12V/24V/48V

    $208.62
    SKU: ATO-DCCON-C1000
    This 1000A DC contactor has a metal outer surface and adopts environmentally friendly electroplating, which is not only environmentally friendly but also anti-oxidation. The DC contactor with a large current of 1000A can provide 12V, 24V, 48V and other high voltage dc contactor options.

    12 Amps 3 Pole AC Contactor 24V/110V/220V Coil

    $51.46
    SKU: ATO-ACCON-012
    Buy AC contactors from manufacturer at good price, 3 pole contactor relay has the advantage of small volume, light wight and low cost. With coil voltages of 24V/110V or 220V AC, rated current 12A at 380V, 9A at 660V. As a bypass contactor frequently start and control AC electric motors.

    12A Star Delta Starter, 5.5kW/ 10kW, 220V/ 380V AC

    $89.99
    SKU: ATO-STAR-12
    Low price star delta starter for sale, 12 amp rated operational current, 5.5kW/ 10kW (7.5Hp/ 14Hp) power, working at 220V or 380V AC voltage, consists of 3 contactors and an air delay head. This wye delta connection is used for 3 phase induction motor circuit control.

    1500A DC Contactor, 12V/24V/48V

    $233.15
    SKU: ATO-DCCON-C1500
    The coil voltage of this 1500A contactor is 12V DC contactor, 24V DC contactor, 48V DC contactor, etc. This DC contactor with a large current of 1500A is made of selected thermosetting BMC material and has no burning points. Wear-resistant, non-breaking and stable in performance.

    30A High Voltage DC Contactor, 12V/24V coil

    $87.23
    SKU: ATO-DCCON-HV30
    Cheap Price DC contactor relay, normally open (SPST-NO) type , 30 amps rated load current of contact circuit, available with 12V or 24V coils. Magnetic contactor is widely used in the DC 12-900V high voltage field, offers exceptional performance in an extremely small and lightweight device.

    50A High Voltage DC Contactor, 12V/24V coil

    $111.85
    SKU: ATO-DCCON-HV50
    High voltage DC contactor, normally open type (SPST-NO), 50 amps rated load current of contact circuit, available with 12V or 24V coils, the connection of contact and coil need to be nonpolarity. It is widely used in the DC high voltage field, such as electric car, wind power generation, DC power supply control system and so on.

    100A High Voltage DC Contactor, 12V/24V coil

    $118.92
    SKU: ATO-DCCON-HV100
    The ATO-ADH100 contactor is specially design to meet the requirements of high voltage DC switching applications. Available with 12V or 24V coils, SPST-NO contact form, 100A rated load current of contact circuit, DC 12-900V rated load voltage.

    18 Amps 3 Pole AC contactor 24V/110V/220V Coil

    $55.50
    SKU: ATO-ACCON-018
    The good performance AC contactor relay provides 24V, 110V, 220V coil voltage, rated at 18A when used at AC-3 380V, and 12A when used at AC-3 660V. 3 pole contactor with three main normally open contact and one normally open/closed auxiliary contact, and it can frequent start and control the AC motors.

    18A Star Delta Starter, 11kW/ 15kW, 220V/ 380V AC

    $96.39
    SKU: ATO-STAR-18
    Star delta starter for sale at economic price, 18 amp rated operational current, 11kW/ 15kW (15Hp/ 20Hp) power, working at 220V or 380V AC voltage, optional contact form 3P+NO or 3P+NC. This y delta motor connection starter consists of 3 contactors and an air delay head, which is used for 3 phase induction motor circuit control.

    3 Phase AC Vacuum Contactor, 250/400/630A, 7.2kV

    $895.95
    SKU: ATO-VCON-250630
    Cost-effective 7.2kV ac contactor is mainly composed of vacuum switch tube and accessories. Rated current can be chosen from 200A/ 400A/ 630A. The ac contactor allows the operating frequency of 300 time/ h and the power frequency withstand voltage is up to 32kV voltage.

    150A High Voltage DC Contactor, 12V/24V coil

    $154.92
    SKU: ATO-DCCON-HV150
    High voltage contactor, 150A rated load current of contact circuit, operating voltage up to 900V, normally open type (SPST-NO), is specially design to meet the requirements of high voltage DC switching applications.

    A contactor is an automatic electromagnetic switch that closes and disconnects the current through the contacts through electromagnetic force. In addition, the magnetic contactor also has a low pressure release function, which is suitable for frequent operation and running distance control.

    In electrical engineering, because the contactor is a device that can quickly cut off the AC and DC main circuits and can frequently turn on and off high-current control (up to 800A) circuits, it is often used in motors as control objects, and it can also be used as a control object. The electrical contactor is used to control electrical loads such as factory equipment, electric heaters, working mother machines and various power units. The contactor has a large control capacity, which is suitable for frequent operation and long-distance control, and is one of the important components in the automatic control system.

    Contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC). As a high-power switching device, it is widely used in aerospace, aviation, weapons, ships, electronics and other system equipment. The control load current is greater than 25A, and the voltage is 25VDC; 115VAC, 402Hz; 386VAC, 50Hz. The power distribution switch controls the power supply or controls the start-stop control of high-power motors. It is a key device in the equipment and plays an important role.

    How does the contactor work?

    The magnetic contactor is mainly composed of electromagnetic mechanism, contact system and arc extinguishing device. The electromagnetic mechanism is a sensing element, and when it senses a certain electrical signal, it will drive the contacts to close or break. It mainly includes coil, iron core and armature.

    When the contactor coil is energized, the coil current will generate a magnetic field, and the generated magnetic field will make the static iron core generate electromagnetic attraction to attract the moving iron core, and drive the AC contactor point to move, the normally closed contact is disconnected, the normally open contact is closed, and the two are linked. When the coil is powered off, the electromagnetic attraction disappears, and the armature is released under the action of the release spring, so that the contacts are restored, the normally open contacts are disconnected, and the normally closed contacts are closed. The working principle of a DC contactor is somewhat similar to that of a temperature switch.

    5 types of contactors on ATO.com

    DC contactor
    DC contactors

    DC contactor refers to a contactor whose iron core is DC control, and its load can be either DC or AC. The iron core of the DC contactor is different from the AC contactor. It has no eddy current, so it is generally made of mild steel or industrial pure iron into a round shape. Since the attracting coil of the DC contactor is connected to DC, there is no impact starting current, and there is no violent impact of the iron core, so it has a long service life and is suitable for frequent starting and stopping.

    AC contactor
    DC contactors

    AC contactors often use three types of arc extinguishing methods: double-break electric arc extinguishing, longitudinal seam arc extinguishing and grid arc extinguishing. It is used to eliminate the arc generated by the moving and static contacts during the opening and closing process. Contactors with a capacity of more than 10A have arc extinguishing devices. The AC contactor also has auxiliary components such as reaction spring, buffer spring, contact pressure spring, transmission mechanism, base and terminal.

    Vacuum contactor
    Vacuum contactor

    The vacuum contactor uses a vacuum interrupter to extinguish arcs to frequently connect and cut off the normal working current. It is usually used to remotely connect and disconnect medium and low voltage 6kV, 380V (660V, 1140V) with frequent start and stop. ) AC motor.

    Lighting contactor
    Lighting contactor.

    The lighting contactor is a relay switch, providing reliable and convenient lighting control. Magnetic contactors operate at lower but safer loads and optimize the electromagnetic system to reduce maintenance power.

    Definite purpose contactors
    Definite purpose contactor

    ATO has dedicated contactors designed for the heating, ventilation, air conditioning and refrigeration industries.

    What are the main parts of a contactor?

    Taking AC contactor as an example, it consists of electromagnetic mechanism, contact system, arc extinguishing system, reaction force device, bracket and base.

    1. Electromagnetic mechanism

    The composition of the electromagnetic mechanism: It is composed of electromagnetic coil, iron core and armature.

    The function of the electromagnetic mechanism: the closing and opening of the operating contacts.

    2. Contact system

    The magnetic contact is the first opening element of the contactor, which is used to make or break the controlled circuit. The contact system includes main contacts and auxiliary contacts.

    • Main contact: Used in the main circuit with large on-off current.
    • Auxiliary contact: Used to connect or disconnect the control circuit, only a small current can be passed.

    3. Arc extinguishing system

    Contactors with a capacity of more than 10A have arc extinguishing devices, often using longitudinal slit arc extinguishing covers and grid arc extinguishing devices.

    4. Reaction device

    Including spring, transmission mechanism, terminal and shell, etc.

    5. Brackets and bases

    For fixing and installation of contactors.

    Difference between AC contactor and DC contactor

    1. The main difference between AC contactor and DC contactor is in the iron core and coil. There are eddy currents in the electromagnet core of the AC contactor, so the electromagnet cores are made into pieces and stacked together. The electromagnet core of the current contactor is an integral iron core, the coil is slender and the number of turns is particularly large.

    2. The main circuit of the DC contactor is generally two poles, and the DC only has positive and negative poles. The AC contactor has three poles because of the opening and closing of three-phase electricity.

    3. For the AC circuit, when the contactor is disconnected, the overvoltage generated by the circuit is small. At the same time, when the AC arc has a zero-crossing time, the arc will be extinguished and reignited after the zero-crossing, so the AC arc measures are relatively easy. For the DC circuit, when the contactor is disconnected, the overvoltage generated by the circuit is too high, and the arc is not easy to extinguish. It can be seen that compared with the AC contactor, the DC arc extinguishing measures are relatively difficult.

    4. The protection coordination relationship (SCPD) of DC and AC is different, and the parameter table must be carefully consulted when using.

    Why use contactors to control motors?

    When the motor starts, its starting current is very large. Generally, the starting current of the motor should be 5-7 times, and the starting current of the small-capacity motor is larger. When the motor is disconnected, since the motor is an inductive load, a relatively high voltage will be induced at both ends of the switch contacts at the moment of disconnection, thereby breaking down the air gap between the contacts and forming an arc. Therefore, the electrical appliance that controls the breaking motor must have the ability to withstand the impact of the starting current and extinguish the arc when it is disconnected. Therefore, an electrical appliance with the above-mentioned capabilities, such as a contactor or an air switch, is chosen to control the breaking motor.

    The control relay node does not have the above functions, so use the relay node to start the contactor, and use the contactor node to control the motor. In places with a high degree of automation, the contactor is used as the final actuator for the start and stop of the motor due to its low price and reliability. Large motors above 4200KW are also controlled by air switches. This is often used in large industrial enterprises, because at this capacity class, the contactor is not sufficient. The most important thing is that the contactor can meet the closing-opening operation of 300,000 times, and can meet the component life requirements of frequent starting and stopping electrical circuits.