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    3 Phase AC Vacuum Contactor, 200A, 1140V

    $343.11
    SKU: ATO-VCON-200
    Rated 1140V, 200A ac vacuum contactor is used for frequently switch on and off the normal working current. 3 phase, 36 volt or 220 volt control circuit, 2±0.2 mm open distance, 80±20 N final power, 1500000 times electrical life.

    3 Phase AC Vacuum Contactor, 250A, 1140V

    $364.35
    SKU: ATO-VCON-250
    ATO provides low price 4 pole 3 phase ac vacuum contactor with rated voltage of 1140V and rated current of 250A. 36V/ 110V/ 220V/ 380V control circuit can be selected. 2±0.2 mm open distance, 80±10N final power, AC 50Hz or 60Hz frequency.

    3 Phase AC Vacuum Contactor, 400A, 1140V

    $422.85
    SKU: ATO-VCON-400
    36V/ 110V/ 220V/ 380V coil voltage ac vacuum contactor for sale online is three phase ac contactor. Its main circuit rated voltage is 1140 volt and the rated current is 400 A. The contactor is designed for frequency starting and controlling AC motor in the power system with AC 50Hz - 60Hz. 2±0.5 mm open distance, 120±20 N final power.

    3 Phase AC Vacuum Contactor, 630A, 1140V

    $599.41
    SKU: ATO-VCON-630
    Buy three phase 630A, 1140 volt vacuum contactor at affordable price. Coil voltage 36V, 110V, 220V, 380V are available. The coil has good conductive effect, is not easy to generate heat, and is safe and reliable. AC 50 Hz or 60 Hz frequency, 2±0.5 mm open distance, 190±20 N final power.

    3 Phase AC Vacuum Contactor, 800A, 1140V

    $742.69
    SKU: ATO-VCON-800
    AC 50Hz/ 60Hz vacuum contactor has three enlarged vacuum tubes for better contact performance. 1140V rated voltage, 800A rated current, 190±20N final power. 3 phase ac contactor coil is sensitive to conduction and carries a large instantaneous current.

    9 amp 3/4 Pole DC Contactor, 12V/24V/48V/220V Coil

    $54.69
    SKU: ATO-DCCON-9A
    DC contactor is an electrical controlled device used to switch current on and off, with 3 pole or 4 pole contact form, 9 amp rated current, making and breaking the connection between the power source and the load. 12V, 24V, 48V, 220V coil voltages are available.

    1 Pole Definite Purpose Contactor, 20 amp ~ 40 amp

    $54.44
    SKU: ATO-DPC-1P
    High performance 20A definite purpose contactor for sale online. 25 amp, 30 amp and 40 amp DP contactor are available. Coil voltage 24V, 110V/120V, 208V/240V, 277V for selection. 1 pole air conditioner contactor works at 50/60 Hz, designed for the heating, ventilation, air conditioning and refrigeration (HVAC) industry.

    12 amp 3/4 Pole DC Contactor, 12V/24V/48V/220V Coil

    $54.99
    SKU: ATO-DCCON-12A
    12 amp DC contactor with 3 or 4 pole for sale at low price. 12V, 24V, 48V, 220V coil voltages are optional, rated power up to 7.5 kW (10HP). It is an electrical switching device widely used in the control system of DC electric control, storage battery circuit and capacitance circuit.

    16 amp 2/4 pole Lighting Contactor, 24V/110V/220V Coil

    $58.03
    SKU: ATO-LCON-16
    Low price 16 amp 2 pole lighting contactor with 100,000 cycles, coil voltage 12V/24V DC and 110/220V AC. 2 pole & 4 pole contactors are relay switches, have extra long life and low noise, work at a safer load. Contactor auxiliary contacts for selection. AC contactor is used to control lighting systems, supplies for large-scale industrial and commercial.

    18 amp 3/4 Pole DC Contactor, 12V/24V/48V/220V Coil

    $56.99
    SKU: ATO-DCCON-18A
    3 or 4 pole AC contactor is an electrical switching device to control electric motors, lighting and other electrical loads at 18 amp rated current. Rated power up to 10 kW, contact form 3 NO or 2NO+2NC, coil rated voltage of 12V, 24V, 36V, 48V, 110V, 220V for your choices.

    2 Pole Definite Purpose Contactor, 20 amp ~ 90 amp

    $56.50
    SKU: ATO-DPC-2P
    Low price 2 pole definite purpose contactor is the air conditioner contactor. 20 amp ~ 90 amp HVAC contactor works at 50/60 Hz frequency and provides 24V, 110V/120V, 208V/240V, 277V coil voltage. DP contactor with compact load control, suitable for motors and compressors in resistance heating, air conditioning and refrigeration, and food service equipment.

    20 amp 2/4 pole Lighting Contactor, 24V/110V/220V Coil

    $62.03
    SKU: ATO-LCON-20
    20 amp lighting contactor for sale online. 2 pole and 4 pole ac contactors are available, coil voltage 12V/24V/110/220 modular contactor with rail type has 100,000 cycles, optional auxiliary contacts, low noise and extra long life, provides reliable and convenient lighting control, used in large-scale industrial and commercial.

    25 amp 2/4 pole Lighting Contactor, 24V/110V/220V Coil

    $66.58
    SKU: ATO-LCON-25
    2 pole & 4 pole Lighting contactors are relay switches, offer 25 amp, 100,000 cycles, optional auxiliary contacts and 12V/24V DC, 220V/110V AC coil voltage. Low noise and long life, operate at a safer load. AC contactor price is low. Magnetic contactor used to control lighting systems, supplies for home, large-scale industrial and commercial.

    25 amp 3/4 Pole DC Contactor, 12V/24V/48V/220V Coil

    $64.79
    SKU: ATO-DCCON-25A
    Economical price 25 amp DC contactor with 3 or 4 pole for sale. It is an electrical switching device used to connect and break of the circuit load. 12V, 24V, 48V, 220V coil voltages are optional, rated power up to 15 kW (20HP), can meet the special demand of electric locomotive, diesel locomotive and electric motor car group.

    3 Phase AC Vacuum Contactor, 1000A, 1140V

    $799.51
    SKU: ATO-VCON-1000
    ATO provides 1.14 kV ac vacuum contactor at affordable price. Coil voltage of 36V, 110V, 220V, 380V can be customized. It is a 3 phase contactor with 1000A rated current, 2±0.5 mm open distance, 190±20N final power. The contactor shell is made of high-quality flame-retardant materials with high strength, high temperature resistance and corrosion resistance.

    3 Pole Definite Purpose Contactor, 20 amp ~ 90 amp

    $59.60
    SKU: ATO-DPC-3P
    Buy a 3 pole definite purpose contactor at low cost. It is an ac contactor that has 24V, 110V/120V, 208V/240V, 277V coil voltage and works at 50/60 Hz. Wide current range 20 amp ~ 90 amp DP contactor for selection. Air conditioner contactor is an electrically operated switching device, used for the heating, ventilation, air conditioning and refrigeration (HVAC) industry.

    32 amp 3/4 Pole DC Contactor, 12V/24V/48V/220V Coil

    $66.29
    SKU: ATO-DCCON-32A
    12V 24V 48V 220V DC contactor works to connect and break of the circuit load, which can fully meet the special demand of electric locomotive, diesel locomotive and electric motor car group. 3 pole (3NO) or 4 pole (2NO+2NC) contact form, 32 amp, high performance and low price.

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

    $70.69
    SKU: ATO-LCON-32
    Hot selling 4 pole lighting contactor with coil voltage 220V/110V AC, 100,000 cycles, contactor auxiliary contacts for selection, low noise and long life, ac contactor works at a safer load, used to control the lighting systems, supplies for household appliances, industrial and commercial.

    4 Pole Definite Purpose Contactor, 25 amp ~ 40 amp

    $69.30
    SKU: ATO-DPC-4P
    Get a high performance 4 pole definite purpose contactor at low price. It has 24V, 110V/120V, 208V/240V, 277V coil voltage. 25 amp / 30 amp / 40 amp air conditioner contactor is an electronically controlled switch that is used for switching a power circuit. AC contactor works at 50/60Hz, designed for the heating, ventilation, air conditioning and refrigeration (HVAC) industry.

    40 amp 3/4 Pole DC Contactor, 12V/24V/48V/220V Coil

    $90.89
    SKU: ATO-DCCON-40A
    3 or 4 pole AC contactor is an electrical switching device to control electric motors, lighting and other electrical loads at 40 amp rated current. Rated power up to 30 kW, contact form 3 NO or 2NO+2NC, coil rated voltage of 12V, 24V, 36V, 48V, 110V, 220V for your choices.

    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.