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8 relays module


Control module with 8 relay + optocoupler, ready to use

  • Logic: 3.3 & 5V
  • Arduino & Raspberry-Pi

More details

This product is no longer in stock

18,03 € tax incl.


Control the world around you with the help of relays

Here is 8 relay board ready to use with your 5 & 3.3 volts based micro controller or nano-computer projects.

This board does offer all the electronic to control and power the 8 relays... each one being able to commute up to 10 Amp under 250V AC (the whole thing protected with optocouplers to keep your Arduino safe and secure). The advanced user will appreciate the JD-VCC <-> VCC jumper which allows to separate the logic control voltage (via VCC) from the relay power supply (JD-VCC, always 5 Volts). You just need to remove the jumper and apply the 5 volts JD-VCC for the relay. Then you power the logic at a different voltage (eg: 3.3V) via the VCC pin.
If you want to work with 5V power supply then just leave the JD-VCC <-> VCC jumper right in place.

Convenient, this board will offer a galvanic isolation between the low voltage components (your Arduino) and the high voltage load (the relay + your load wired to the relay).


The pins follow the standard 2.54mm spacing (like breadboards). Then, you can use molex connector or dupont wires (please see our wire assortment). The power contacts of the relays are routed to 5mm screw terminals (3 contacts terminals).

The board has 4 fixing holes (3mm diameter).


To activate a Rx relay, you have to draw the corresponding INx pin to the ground (GND).
If the potential is not driven to the ground by the microcontroller then the INx pin is pull-up to 5 volts (or ~3.3V if you are powering the logic VCC pin with a 3.3V power supply).

Waring: do NOT WIRE DIRECTLY the INx pins to you Raspberry-Pi (or 3.3v microcontroller) WITHOUT REMOVING the JD-VCC jumper!
With the JD-VCC jumper in place, the INx are pull-up to the ~4.7 volts!.
If you want to use the relay board with 3.3V logic board, you have to remove the JD-VCC jumper and apply 3.3V to the VCC pin. Thereafter the INx pin will be pull-up to 3.3v (via VCC).

Technical details

  • compact module.
  • Indicator LED indicating the relays states.
  • Using a flyback diode
  • Each relay need 63mA under 5 Volts when activated
  • Input pin sinks.
    • VCC = 5 Volts => activating current = 2.0 mA (current sink to the ground)
    • VCC = 3.3 Volts => activating current = 0.5 mA (current sink to the ground)
  • Size: 138 x 56mm (hauteur: 18mm)

Working with higher voltage

Working with a voltage higher than 30V can be dangerous (in case of accidental contact). Higher voltage wiring should be done by skilled people. For safety reason, do not hesitate to ask help to a friend having the required "high voltage" skills.
Even rated for 230V AC, this product is not certified for industrial use or power networks in our country. So we recommend it for low voltage usage to our makers.



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