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.

Purchase Products

Product features

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 3 Certified

Technical specifications

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.


Inputs and Outputs

Expansion Modules

SMART-Net™  Expansion Board
For SMART-Net™ devices that use terminal-block connections instead of modular RJ11 connections, 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 externally or by the host controller with 24 VAC or VDC, 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.