I am attempting to use this relay, the CC12, to turn the 120VAC power to a motor/motor controller on and off using a 24VDC signal (These voltages are specified in the datasheet.), and I've gotten rather lost as to which connectors to plug into what.

I know that the A1 and A2 input and output are the main power terminals, but other than that, I'm stuck. How would I achieve the result I have described?

I am providing a picture of the contactor here to give more context:

Contactor Top (The A1 and A2 inputs and outputs are on the sides, not shown in the picture.)

EDIT: I realized that a diagram I had included as part of my question didn't actually apply to the screw-terminal version of the contactor (which I have).

  • \$\begingroup\$ Is your motor a 3 phase or only single phase? \$\endgroup\$
    – G36
    Jul 30, 2018 at 19:38
  • \$\begingroup\$ The diagram is confusing but I would say that you can ignore the diagram and connect the 3 phases to the R, S and T terminals and the motor to U, V and W. \$\endgroup\$ Jul 30, 2018 at 19:40
  • 3
    \$\begingroup\$ Also, from what I see here digikey.com/product-detail/en/carlo-gavazzi-inc/CC12SA120/… the coil voltage is 120VAC So it will be impossible to turn it ON via 24VDC \$\endgroup\$
    – G36
    Jul 30, 2018 at 19:41
  • 1
    \$\begingroup\$ L1/L2/L3 is the 3 phase supply and U/V/W to the 3 phase motor. A1 and A2 to supply for the coil to TURN-ON or TURN-OFF the contractor \$\endgroup\$
    – G36
    Jul 30, 2018 at 19:44
  • \$\begingroup\$ The motor controller is single-phase \$\endgroup\$
    – Blapor
    Jul 30, 2018 at 19:44

1 Answer 1


First a few clarifications, the contactor you posted is the CC12SA120, the A120 in that part number indicates a coil operated by 120VAC. So if this particular contactor pictured has a 24VDC coil, then the part should be the CC12SD24.

If you have 24VDC control and the contactor you are trying to connect is the 120VAC coil version then you would have to find a way to change your control voltage (not commenting on because I do not know your control setup), or purchase the correct contactor.

This contactor allows for a 3-phase connection but because of your reply in comment that this application is a single-phase 120VAC motor, you only need to use one set of terminals. I would suggest connecting your supply to L1 and the motor to T1.

  • \$\begingroup\$ Thanks for the well-explained answer! I am unable to change the controls to use 120VAC, but I will likely attempt to order a contactor that is more suited to my needs. \$\endgroup\$
    – Blapor
    Jul 30, 2018 at 20:09
  • \$\begingroup\$ You said I should connect to L1 (in from power outlet) and T1 (out to motor), but there are two power wires, as AC power tends to have, so through which terminal set do I put the second wire? \$\endgroup\$
    – Blapor
    Jul 30, 2018 at 20:31
  • \$\begingroup\$ Also, where would the activation/deactivation signal go? \$\endgroup\$
    – Blapor
    Jul 30, 2018 at 20:33
  • \$\begingroup\$ Neutral and ground always remain connected; you are only connecting/disconnecting the hot wire with the contactor. A1 and A2 are the coil terminals, which is where you connect the control signal. For the contactor your linked, the control terminals take 120VAC to close the contacts. \$\endgroup\$
    – CoreyF
    Jul 30, 2018 at 20:38
  • \$\begingroup\$ Ok, thanks, I think that comment alone gave me a much better understanding of how this works \$\endgroup\$
    – Blapor
    Jul 30, 2018 at 20:44

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