SKU: PRM3 - Power Relay Module


The eGauge Power Relay Module is a versatile device intended to control up to three 240V AC/15 A resistive loads or motors up to 15 FLA (80 LRA). The relays can be opened and closed individually or synchronously, enabling the switching of up to three single-phase loads, one split-phase and one single-phase load, or one three-phase load.


The relay module can be controlled using the eGauge Core or Pro meter (via interactive dashboard, Lua script, or JSON API), as well as using SCPI text-commands via USB and Modbus RTU via RS-485 interface.


Visit the support library product page for more information.


  • Power Relay Module (PRM3)
  • 6' USB Type-A to USB Type-B 2.0
  • 3x 2-pin plugs for relay contacts
  • 1x 4-pin plug for RS-485 interface

Tech Specs

  • 3 12-24 AWG relay contacts each rated for 240V / 15A 50-60Hz (individual and synchronous control)
  • -30 to 70 °C, up to 4,000m altitude
  • Max humidity 80% up to 31 °C
  • Powered by USB or 5V 500mA supply via 2-pin terminal
  • DIN-rail mountable
  • 90 × 72 × 60 (mm) (3.54 × 2.83 × 2.36 (in.))
  • Controlled via Modbus RTU, SCPI or eGauge Meter
  • UL Listed
    • IEC/UL 61010-1 Ed. 3.0 B:2010, File Number E524350
  • FCC certified
    • FCC’s Title 47 CFR Part 15 Subpart B Class B
    • ICES-003 Information Technology Equipment Class B
  • Relay state persists across power outages
  • SCPI (USB) and Modbus (RS-485) controllable
  • eGauge meter controllable using web browser, Lua scripting or JSON API
  • Configurable minimum open and close duration
  • Includes 1.5m USB Type A to Type B cable
  • 2-year Limited Warranty