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National Control Devices, LLC


USB Relays ProXR Lite

USB Relay

USB Relay Control

USB RelayProXR Lite series USB Relay Controllers allow computer controlled switching using the USB port of your computer.  An NCD USB Relay Board emulates a COM port, allowing you to speak to the relay board using any programming language that supports serial communications.  COM drivers allow you to assign any COM port to the USB Relay Board.  Many of our relay boards support 8-Channels of 8-Bit / 10-Bit Analog to Digital Conversion (A/D).  On-Board ADCs may also be used to directly control the relays, useful for manual relay control applications.  Trigger timers, flashers, relay pulses, for use in a wide variety of computer controlled switching and automation applications.  ProXR Lite is the industry standard for relay control, backed by a company that's been in business since 1995!

Low Cost and Feature Rich

  • USB Interface mounts as a Virtual COM Port on your PC for easy programming and 100% compatibility across ALL operating systems
  • Plug in, open the Virtual COM Port, and start sending commands
  • 5, 10, 20 or 30 amp relays available
  • Control one relay at a time or all relays at once
  • SPDT, SPST, Solid State AC/DC versions available

USB Relay Boards:

Our USB boards offer your choice of 5, 10, 20 or 30 amp mechanical relays and wide variety of solid state relays.  ProXR Lite controllers are available in 1, 2, 4, and 8 channel versions supporting Analog to Digital Conversion on Board. Computer Controlled USB Relays feature the ProXR Command Set allowing for a unified API to control all relay controllers.

Learn More:

USB Relay Controllers: Choosing the Right Controller
Learn to Use ProXR Series Controllers
Learn about Other Interface Options, Including IoT, Ethernet, WiFi, Bluetooth, and More

ProXR Lite Series at a Glance

  • Low-Cost High-Volume Surface Mount Machine-Manufactured Design
  • Based on 5-Year Warranty Designs with Limited Warranty to Lower cost
  • Offers 100% Emulation of ProXR Enhanced Command Set
  • 8-Channel of 8/10-Bit Analog to Digital Conversion
  • Supports 1, 2, 4, or 8 Relays on Bank 1
  • Not Expandable to Save Cost
  • Aggressive Quantity Discounts Available
  • Available with USB, 802.15.4, XSC, or ZigBee Mesh Interface