USB Relay Controller Board

USB Relay Controller Board at a Glance...

  • 2 Relays Installed on a Circuit Board
      - Non-Expandable ProXR Lite Design
  • Onboard USB Interface Module
      - Connects Directly to a USB Pport
      - Mounts as a Virtual COM Port for Seamless Integration
  • Industry-Leading ProXR Command Set
      - Program in Nearly Any Language
      - Send Precise Relay Commands
      - Toggle, Flash, and Timing Control
  • ProXR AD8 Command Set (Input Support)
      - Read 0-5V Sensors
      - Monitor External Sensors or Contact Closure
      - Use Inputs to Trigger Relays

Selecting the Proper Amperage

To ensure you choose a board with the correct relay amperage for your load requirements, refer to Choosing a Proper Amperage.

Need a 2-channel USB relay for independent device control? These ProXR Lite boards let you switch two relays using a USB Connection.

USB Relay

The USB Relay interfaces directly with a host computer via USB and mounts as a virtual COM port, enabling command-level control of the relay on the board. When communicating over USB, all relay commands are transmitted from a virtual COM port over a direct USB connection to the controller, ensuring stable, high-speed data exchange without additional configuration.

2-Channel USB Relay Series (ProXR Lite)

2-Channel USB Relay Boards are available in the non-expandable ProXR Lite version. While ProXR Lite boards cannot be expanded, they still support the full ProXR Command Set - the industry's most powerful relay control protocol.

- Program in nearly any language.
- Send precise relay commands.
- Control with confidence.

Select Your Relay Amperage

USB Relay Controller BoardWhat amperage relay do you need?

Choose from 5A, 10A, 20A, or 30A relay options based on the load you are switching.
  • 5A / 10A / 20A - SPDT Relays
  • 30A - SPST Relay
Need help selecting the right relay amperage?
Use our Choosing a Proper Amperage to make the right call for your application.

💡 Relay Pros Pro Tip:

If you're controlling high-current loads like motors or heaters, always choose a relay with extra amperage headroom. Running a relay at its maximum rating can shorten its lifespan.