8 Channel Relay Module with USB (USB-RLY08-B)

The "USB-RLY08-B" is an eight channel relay module that is powered and controlled via a USB connection using a simple command set. Each high quality relay is rated at 1Amp and the normally open, normally closed and common connections are available via screw terminals.

Not currently available

Our Code: MCU-60087


The USB-RLY08 provides eight volt free contact relay outputs with a current rating of up to 1Amp each. It is powered from any standard USB bus and has an exceptionally low maximum current consumption of approx. 90mA with all relays on. The relays are SPCO (Single Pole Change Over) types. The normally open, normally closed and common pins are all available on the screw terminals.


  • Number of Relay's - 8
  • Power - Powered from standard USB bus
  • Control interface - USB
  • Relay current - Up to 1Amp @30vdc or 60vac. 500mA@110vac. 250mA@250vac
  • Connections - Screw Terminals for N/O N/C and Common contacts.

LED indication

The USB-RLY08 provides a red LED mounted immediately next to each relay to indicate whether it is in a powered state (LED on), there is also two LED's which will flash with USB transactions to and from the module, green indicating reception of data from the PC and yellow the transmission of data to the PC. Finally there is red power LED mounted on the opposite side of the board to the USB connector. 


Full Technical Documentation