Single Channel Relay Board


A relay is a simple electrically triggered mechanical switch.  They are slower than their solid state counterparts but unless you are going to use PWM or need to switch very rapidly for some other reason the speed is more than enough in most cases.  The benefits of using a relay over solid state components like a transistor or mosfet is they can handle higher voltages and can switch both AC and DC.


  • Runs on 5 volts (it is possible to run on 3.3 but is a bit slower)
  • Handles voltage up to 250 VAC and 30VDC
  • Handles current up to 10 A
  • 5 pins broken out (2 are Vcc, 2 are GND, and 1 control)
    • The 2 power lines both need to be powered for the module to work.  It is controlled by an optocoupler chip built in so one powers the chip and one powers the relay.  There are jumpers that are defaulted to closed that tie these two power lines together so as long as these jumpers are not removed it is only necessary to supply voltage to one of them.
  • The relay is completely separated from the microcontroller with an optocoupler to prevent back EMF from possibly damaging or interfering with the controller
  • 2 outputs (one normally open and one normally closed)
  • A 3 slot screw terminal for the load input and outputs
  • An LED to indicate whether the relay has been triggered or not
  • To activate the relay pull the CTRL (control) pin low (to ground)
  • Shipping Weight: 0.0523lbs
  • 3 Units in Stock
  • Manufactured by: WE Electronics

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This product was added to our catalog on Saturday 23 March, 2013.