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

  • Easily install in small electrical wiring bays within unitary equipment.
  • Installs onto standard electrical box.

Easy Programming with RC-Studio Software

  • Map up to four input/output objects.

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.
  • Includes status LED for each relay.
  • Allows you to verify wiring without connecting to software.

Optional Relay Outputs

  • Add up to four 20 A 347 VAC line-wire-switched mechanical relays.

Optional Conduit Cover

  • Provides Plenum rating to product.
  • Encloses and protects all wires.
  • Accessible top cover for service.

SMART-Net Connection Status LED

  • Indicates SMART-Net connection status and operation.


  • 5 years.
RoHS 3 Certified

Technical specifications

Supply Voltages

  • 5 VDC at 20 mA sourced from controller via SMART-Net.
  • 24 VAC at 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.

Line-Voltage Wiring

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

Optional Relay Outputs

  • Range on/off.
  • Zero cross switching.
  • Tungsten load (TV-20 class): 25k cycles.
  • Electronic ballast load (NEMA 410): 6k cycles.
  • Capacitive load (IEC 60669-1): 5k cycles.
  • Expected life resistive load, 100k cycles.

Relay Load UL/cUL Rating

  • 277 VAC, 20 A resistive, 20k cycles.
  • 347 VAC, 15 A resistive, 20k cycles.
  • 277 VAC, 20 A electronic ballast, 6k cycles.
  • 347 VAC, 15 A electronic ballast, 6k cycles.
  • 277 VAC, 20 A standard ballast, 20k cycles.
  • 347 VAC, 15 A standard ballast, 20k cycles.
  • 277 VAC, 20 A tungsten, 20k cycles.
  • 1.5 HP 120 VAC 40°C, 30k cycles.
  • 3 HP 240 VAC 40°C, 30k cycles.

Conduit Cover (-CC Models)

  • 50 mm conduit cover for low-voltage wires.
  • 1/2" NPT knockout.

Hand/Off/Auto Switches (-H Option)

  • Up to four SP3T slide switches to manually set outputs to Hand, Off, or Auto.
  • Green status LED.
  • Software feedback to show the current switch position.

Enclosure and Mechanical

  • Robust extruded aluminum.
  • 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).

Mounting Hardware

  • 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.


  • CE.
  • EN 60730-1.
  • UL 60730-1 Listed.
  • WEEE.


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.