SMART-Net Relay 20A

The SMART-Net™ Relay 20A is a compact, multichannel line-voltage relay solution that will save you time and money on installation.

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Compact Design

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

Easy Programming with RC-Studio Software

  • Map up to four objects from the system to the SMART-Net Relay outputs.

Connection and Addressing

  • Accepts low-voltage 14-26 AWG wires.
  • Four-wire SMART-Net connection.
  • Configure network address using a four-pole DIP switch.
  • Valid addresses are 1–16.

Easy Line-Voltage Wiring

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

Optional Hand/Off/Auto Switches with Status LEDs

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

Optional Relays

  • Up to four 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 @ 20 mA from controller to SMART-Net.
  • 24 VAC @ 1 VA from external power supply.

Wiring Terminals for Low Voltage

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

Wiring Terminals for Line Voltage

  • 16-inch flying lead 12 AWG (3.31 mm2) stranded core for relays and ground.
  • Color-coded wires.


  • Up to four latching mechanical relays 24–347 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

  • 277 V, 20 Amp resistive, 20k cycles.
  • 347 V, 15 Amp resistive, 20k cycles.
  • 277 V, 20 Amp electronic ballast, 6k cycles.
  • 347 V, 15 Amp electronic ballast, 6k cycles.
  • 277 V, 20 Amp standard ballast, 20k cycles.
  • 347 V, 15 Amp standard ballast, 20k cycles.
  • 277 VAC, 20 Amp tungsten, 20k cycles.

Conduit Cover on -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.
  • 1.2" NPT knockout.


  • Up to four 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 1/2” NPT with lock nut.
  • 1/2” NPT with threaded lock nut to connect to junction box.


  • 12.42 cm L x 12 cm W x 6.4 cm H (4 7/8" L x 4 11/16" W x 2 1/2" H).


  • Supplied with two 1/2" sheet metal screws.
  • Two additional 1/2" screws supplied with optional conduit cover.


  • 0.493 kg (1.09 lb).

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%–90% RH noncondensing.

Application Diagram

Inputs and Outputs

Expansion Modules

SMART-Net™  Expansion Board
The SMART-Net™ Expansion Board maximizes both the number of SMART-Sensor devices you can use and the combined SMART-Net cable length you can connect to a host controller. Powered by the host controller, the SMART-Net Expansion Board supplies power for up to 16 SMART-Sensor devices and does not repeat the SMART-Sensor signal, simplifying field wiring and providing a high degree of flexibility.