Contactors

The electrical contactor has been around for over 100 years dating back to the early 1900's and today's modern contactor, though design changes for safety and performance have occurred, has functionally remained the same as its predecessors. The basic unit is comprised of 3 power poles, L1, L2 and L3 of and these poles are normally open. As the need for a more diverse offering has risen, there are now 2 pole, 4 pole and even contactors up to 12 poles (mostly for lighting applications) that are manufactured today.


A magnetic contactor is one of the most simple pieces of electrical components in the market today. The function is simple: power is applied to the coil (this is referred to as the coil voltage), which creates a magnetic field that pulls the contactors armature together. This causes the 3 moving contacts to connect with the 6 fixed contacts thus allowing power to flow from the line side to the load side and onto the piece of equipment that is being operated.


There are endless applications that one would find a contactor being used to operate electrical equipment. For residential applications, 2 and 3-pole contactors are found in HVAC equipment, sewage pumps and outdoor lighting units. In the commerical arena, they can be found in countless applications, such as capacitor banks, isolation, assembly lines and operating motors and compressors.


When choosing the appropriate contactor for your application, it is important to determine both the horsepower and AMP rating needed along with the specific coil (control) voltage required. Confusion often occurs when trying to determine the AMP rating of a contactor as there are numerous different ratings based on the application.  For example, the 2 most common ratings are AC-3 (inductive) and AC-1 (resistive).  Manufacturers often specify their part numbers based off the AC-3 rating, which is the lower and more common rating to be used.  For example, Schneider Electric manufacturers a part number LC1D32, which is a 32 AMP contactor (AC-3), but is also rated for 50 AMP (AC-1). It is important to know which rating is appropriate when sizing for a specific application.

  • WEG BCXMF01 auxiliary WEG BCXMF01 side dimensions

    BCXMF01

    The WEG BCXMF01 single pole auxiliary comes with one normally closed contact, screw terminals and mounts to the front of any CWM series of contactor from 9 to 105 AMPS.  Up to four auxiliaries can be added to the CWM9 through CWM40 series and six...

    MSRP: $12.00
    $5.20
    Add to Cart
  • WEG BCXMF10 auxiliary WEG BCXMF10 side dimensions

    BCXMF10

    The WEG BCXMF10 single pole auxiliary comes with one normally open contact, screw terminals and mounts to the front of any CWM series of contactor from 9 to 105 AMPS.  Up to four auxiliaries can be added to the CWM9 through CWM40 series and six...

    MSRP: $12.00
    $5.20
    Add to Cart
  • WEG CWM40-00-30V24 contactor WEG CWM40-00-30V24 side label

    CWM40-00-30V24

    The WEG CWM40-00-30V24 IEC contactor has a 208-240v50/60Hz AC coil and is rated for 15 horsepower at 230 volt and 30 horsepower at 460 volt in 3-phase applications. This 40 AMP 3 pole contactor comes with screw terminals, DIN rail or base mounting and up...

    MSRP: $164.00
    $83.64
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  • WEG CWM18 10E contactor WEG CWM18 10E side label

    CWM18 10E

    The WEG CWM18 10E IEC contactor is rated for 5 horsepower at 230 volt and 10 horsepower at 460 volt in 3-phase applications and comes with 1 normally open base mounted auxiliary contact. This 18 AMP 3 pole contactor comes with screw terminals, DIN rail...

    MSRP: $103.00
    $52.53
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  • WEG CWM80 contactor WEG CWM80 side label

    CWM80

    The WEG CWM80 IEC contactor is rated for 25 horsepower at 230 volt and 50 horsepower at 460 volt in 3-phase applications. This 80 AMP 3 pole contactor comes with screw terminals, DIN rail or base mounting and up to six additional front mounted auxiliary...

    MSRP: $270.00
    $137.70
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  • WEG CWM40 contactor WEG CWM40 side label

    CWM40

    The WEG CWM40 IEC contactor is rated for 15 horsepower at 230 volt and 30 horsepower at 460 volt in 3-phase applications. This 40 AMP 3 pole contactor comes with screw terminals, DIN rail or base mounting and up to four additional front mounted auxiliary...

    MSRP: $164.00
    $83.64
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  • WEG CWM32 contactor WEG CWM32 side label

    CWM32

    The WEG CWM32 IEC contactor is rated for 10 horsepower at 230 volt and 20 horsepower at 460 volt in 3-phase applications. This 32 AMP 3 pole contactor comes with screw terminals, DIN rail or base mounting and up to four additional front mounted auxiliary...

    MSRP: $140.00
    $71.40
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  • WEG CWM9 contactor WEG CWM9 side label

    CWM9

    The WEG CWM9 IEC contactor is rated for 3 horsepower at 230 volt and 5 horsepower at 460 volt in 3-phase applications and comes with 1 normally open base mounted auxiliary contact. This 9 AMP 3 pole contactor comes with screw terminals, DIN rail or base...

    MSRP: $72.00
    $36.72
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  • WEG CWM12 contactor WEG CWM12 side label

    CWM12

    The WEG CWM12 IEC contactor is rated for 3 horsepower at 230 volt and 7.5 horsepower at 460 volt in 3-phase applications and comes with 1 normally open base mounted auxiliary contact. This 12 AMP 3 pole contactor comes with screw terminals, DIN rail or...

    MSRP: $89.00
    $45.39
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  • WEG CWM12 10E contactor WEG CWM12 10E side label

    CWM12 10E

    The WEG CWM12 10E IEC contactor is rated for 3 horsepower at 230 volt and 7.5 horsepower at 460 volt in 3-phase applications and comes with 1 normally open base mounted auxiliary contact. This 12 AMP 3 pole contactor comes with screw terminals, DIN rail...

    MSRP: $89.00
    $45.39
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  • WEG CWM18 contactor WEG CWM18 side label

    CWM18

    The WEG CWM18 IEC contactor is rated for 5 horsepower at 230 volt and 10 horsepower at 460 volt in 3-phase applications and comes with 1 normally open base mounted auxiliary contact. This 18 AMP 3 pole contactor comes with screw terminals, DIN rail or...

    MSRP: $103.00
    $52.53
    Choose Options
  • WEG CWM9 10E contactor WEG CWM9 10E side label

    CWM9 10E

    The WEG CWM9 10E IEC contactor is rated for 3 horsepower at 230 volt and 5 horsepower at 460 volt in 3-phase applications and comes with 1 normally open base mounted auxiliary contact. This 9 AMP 3 pole contactor comes with screw terminals, DIN rail or...

    MSRP: $72.00
    $36.72
    Choose Options