• USB-IIRO4-DB
  • USB 4 isolated input, 4 relay output unit in a rugged enclosure
  • USB 4 optically isolated inputs, 4 form C relay outputs
  • I/O adapter for USB 1.1 and 2.0 port hosts
  • Small (4"x4"X1.25") rugged industrial enclosure
  • All required power drawn from USB port, no external power adapter required
  • Description
  • Specifications
  • Downloads
  • Ordering Guide
  • Request Quotation


  • The USB-IIRO4-DB Features Include:
    • USB 4 optically isolated inputs, 4 form C relay outputs
    • I/O adapter for USB 1.1 and 2.0 port hosts
    • Small (4"x4"X1.25") rugged industrial enclosure
    • All required power drawn from USB port, no external power adapter required
  • Specification
  • Value
  • Bus Interface/Form factor
  • USB2.0
  • No of Digital I/O
  • 4 Isolated in, 4 Relay out
  • Output Type
  • SPDT Electromechanical Relay
  • Input Source Current/Isolation
  • 31VDC/AC
  • Sink Current/Relay Rating
  • 1A 24VDC/0.5A 125VAC
  • Change of State Detection on input
  • Yes
  • Counter/Timers
  • -
  • Connectors
  • Screw Terminals
  • Size
  • 101.6x101.6x31.75(WxDxHmm)
  • Power Requirements
  • USB 5V
  • Data Sheets (pdf)
  • Technical Manuals (pdf)
  • Product Information
  • Internet Links
  • White Papers
  • USB Communication and I/O Devices: USB has become the standard method of connecting peripherals to modern computer systems. Interworld Electronics has an extensive range of USB to Serial Converters, USB Analogue Data Acquisition and USB Digital I/O devices....
  • Part Numbers
  • USB-IIRO4-DB
  • USB 4 isolated input, 4 relay output unit in a rugged enclosure with screw terminals