SMART-Net Relay 20A

The Reliable Controls SMART-Net™ Relay 20A provides controls contractors with a compact, multi-channel, line voltage relay solution that saves time and money.

Purchase Products


Compact Design

  • For installation into small electrical wiring bays within unitary equipment.
  • Installs onto standard electrical box with 1/2" NPT and lock nut.

Easy Programming (Requires RC-Studio Software)

  • Map up to 4 objects from the system to the SMART-Net Relay's outputs.

Connection and Addressing

  • Accepts wires 14-26 AWG (Low Voltage).
  • Four-wire SMART-Net connection.
  • Configure network address using 4-pole DIP switch.
  • Valid addresses are 1–16.

Easy Line Voltage Wiring

  • Ships with 16 inch, 12 AWG, color-coded flying leads with pre-stripped ends.
  • Flying leads exit though a ½” NPT threaded conduit hub which offers connection to a junction box.
  • Readily meets electrical code requirements to separate Class 1 and Class 2 voltages.

Hand/Off/Auto Switches with Status LEDs (for -H models)

  • 3-position slide switches provide Hand/Off/Auto (HOA) override of each relay.
  • Status LEDs for each relay shows if the relay is on or off.
  • Allows for wiring verification without connection to software.

Optional Relays

  • Up to 4, 20 Amp 347 VAC line wire switched mechanical relays.

Status LED

  • The status LED indicates connection status and correct operation.


  • 5 years.


  • CE.
  • EN 60730-1.
  • UL 60730-1 Listed.
  • WEEE.
RoHS 2 Certified

Tech Specs

Supply Voltages

  • 5 VDC @ 20mA (from controller to SMART-Net).
  • 24 VAC @1 VA (from external power supply).

Wiring Terminals (Low Voltage)

  • 14 to 26 AWG (2.08 mm2 to 0.13 mm2) for SMART-Net and 24 VDC supply.
  • Stranded or solid core.
  • Copper conductors only.

Wiring Terminals (Line Voltage)

  • 16 inch, flying lead 12 AWG (3.31 mm2) stranded core for Relays and Ground.
  • Color coded wires.


  • Up to 4 latching mechanical relays 24 VAC to 347 VAC 20 Amp.
  • Range On/Off.
  • Zero cross controlled.
  • Tungsten load (TV-20 class), 25k cycles.
  • Electronic ballast load (NEMA410), 6k cycles.
  • Capacitive load (IEC60669-1), 5k cycles.
  • Expected life resistive load 100k cycles.

Relay Load UL/cUL Rating

  • 277V, 20A Resistive, 30k cycles.
  • 347V, 15A Resisitive, 30k cycles.
  • 277V, 20A Electronic Ballast, 6k cycles.
  • 347V, 15A Electronic Ballast, 6k cycles.
  • 277V, 20A Standard Ballast, 30k cycles.
  • 347V, 15A Standard Ballast, 30k cycles.
  • 277 VAC, 20A Tungsten, 25k cycles.

Relay Load IEC Rating

  • 240V 20A Resistive, 10k cycles.
  • 240V, 200µF Capacitive (IEC 60669-1), 5k cycles.

Conduit Cover (for -CC models)

  • 50 mm conduit cover for low voltage wires.
  • Provides Plenum rating to product.
  • Encloses and protects all wires.
  • Accessible top cover for service.
  • ½“ NPT knockout.

Hand Off Auto

  • Up to 4 SP3T slide switches to manually set outputs to Hand, Off, or Auto.
  • Green status LED to indicate if the output is on.
  • Software feedback to show the current switch position.

Enclosure and Mechanical

  • Robust extruded aluminum.
  • Screw mount and ½” NPT with lock nut.
  • ½” NPT with threaded lock nut to connect to junction box.


  • 12.42 cm L x 12 cm W x 6.4 cm H (4 ?" L x 4 11/16" W x 2 ½" H).


  • Supplied with two ½" sheet metal screws.
  • Two additional ½" screws supplied with optional conduit cover.


  • 0.493 kg (1.09 lbs).

Ambient Limits

  • Operating: 0 °C to 50 °C (32 °F to 122 °F).
  • Shipping: –25 °C to 60 °C (–13 °F to 140 °F).
  • Humidity: 10% to 90% RH non-condensing.

Application Diagram

Inputs and Outputs


SMART-Net™ eXpansion Board
The Reliable Controls SSX SMART-Net expansion board is used to maximize the number of SMART-Sensors and the combined SMART-Net cable length connected to a host controller.