General purpose relay card with 8 opto-isolated, 120V, 3A signal relays and 8, 3V to 60V, AC/DC, opto-isolated voltage sensing inputs.

This card has 3 powering options:

USB power

     External 5V DC with reverse polarity protection.

     External 7 to 24V DC with reverse polarity protection and regulated 5V output on the external 5V terminal for powering your own hardware.


Two LEDs indicate data transfers between your control hardware and the relay card for help with debugging and testing.

Each relay channel or voltage sensing input has its own LED to indicate status.

The card is also available with additional options fitted. See the order codes table in the datasheet. 

The card is RoHS compliant and CE marked.

Contact us for prices on this board with 2-part connectors, or no connectors at all.

Download datasheet

Quickstart Guide

EasyDAQ is primarily a business-to business seller, supplying products around the world, therefore advertised prices exclude VAT. Customers in the UK and Northern Ireland will be charged VAT  at checkout. 

Operational Parameters
Manufacturer EASYDAQ
Control Interface USB
Relay coil voltage 5V
Relay Channels 8
Relay contact current 1A
Digital input channels 8
Relay Type SIGNAL
Connector SINGLE PART CONNECTORS
Wide Input Voltage YES

USB8VI8SRMx

  • Brand: Easydaq
  • Product Code:USB8VI8SRMx
  • Availability:In Stock
  • £107.60


  • 10 or more £86.08
  • 25 or more £76.40
  • 50 or more £71.66
  • 100 or more £67.36
  • 250 or more £62.95
  • 500 or more £58.32

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Tags: USB8VI8SRMx, Signal-Relay-Board, wide-input-voltage-relay, signal-relay-card, signal-relay, usb-controlled-relay, usb-signal-relay, EasyDAQ,