I have previously connected 5V 10A relay switches to my Arduino.

But for my new project I need to use a 5V 30A relay switch with my Arduino.

In 10A relay switches, we make connection with Arduino using GND, VCC and IN.

But for 30A switches, there are DC+, DC-, IN.

My question is that, how do I connect my Arduino to the relay using these pins?

  • DC+ = VCC. Dc- = gnd. In = in.
    – Majenko
    Jul 27, 2019 at 8:06
  • @Majenko Thank you! That answered my question. So, how do I close it?
    – Rajat
    Jul 27, 2019 at 8:21
  • You can mark Hobbes' answer as accepted. (Majenko was faster, but he does not seek the merits, obviously) Jul 27, 2019 at 9:37
  • Plus I was in bed and using my phone, so it's easier to just drop a comment so the OP has the answer they need then later, if it's still needed, craft a proper answer. :)
    – Majenko
    Jul 27, 2019 at 10:26

1 Answer 1


From the Amazon page you linked to:

1 dc+ : Dc power supply positive pole
2 dc- :Dc power supply negative pole (i.e. ground)

VCC: positive DC power supply
GND: ground

technically, VCC = the voltage at the collector of a transistor, these days it's used as shorthand for the positive output pin of an IC.

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