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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 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
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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 CWM18-10-30V18 contactor WEG CWM18-10-30V18 side label

    CWM18-10-30V18

    The WEG CWM18-10-30V18 IEC 110v50Hz/120v60Hz 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...

    MSRP: $103.00
    $52.53
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  • WEG CWM25 contactor WEG CWM25 side label

    CWM25

    The WEG CWM25 IEC contactor is rated for 7.5 horsepower at 230 volt and 15 horsepower at 460 volt in 3-phase applications. This 25 AMP 3 pole contactor comes with screw terminals, DIN rail or base mounting and up to four additional front mounted...

    MSRP: $118.00
    $60.18
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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 CWM9-10-30V47 contactor WEG CWM9-10-30V47 side label

    CWM9-10-30V47

    The WEG CWM9-10-30V47 IEC 415v50Hz/480v60Hz 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...

    MSRP: $72.00
    $36.72
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  • 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 BCXML11 auxiliary WEG BCXML11 side dimensions

    BCXML11

    The WEG BCXML11 two pole auxiliary comes with one normally open and one normally closed contact, screw terminals and mounts to the side of any CWM series of contactor from 9 to 105 AMPS.  Up to two auxiliaries can be added to each side of the CWM9...

    MSRP: $22.00
    $10.92
    Add to Cart
  • WEG BCXML20 auxiliary WEG BCXML20 side dimensions

    BCXML20

    The WEG BCXML20 two pole auxiliary comes with two normally open contacts, screw terminals and mounts to the side of any CWM series of contactor from 9 to 105 AMPS.  Up to two auxiliaries can be added to each side of the CWM9 through CWM105 size...

    MSRP: $22.00
    $10.92
    Add to Cart
  • WEG CWM105 contactor WEG CWM105 side label

    CWM105

    The WEG CWM105 IEC contactor is rated for 40 horsepower at 230 volt and 75 horsepower at 460 volt in 3-phase applications. This 105 AMP 3 pole contactor comes with screw terminals, DIN rail or base mounting and up to six additional front mounted...

    MSRP: $393.00
    $200.43
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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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