SMART-Net Relay

The SMART-Net™ Relay 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 seven input/output objects.
  • Control fan speed using the off/low/medium/high multistate range.
  • Apply pulse-width modulating control using the -SSR option and the 0%–100% analog range.

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 14-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 Fan Speed Control

  • Three dedicated relays for off/low/medium/high speed control.
  • Only one of the three relays may be on at once.
  • Hand/Off/Auto switch protects motor from having two outputs on at once.
  • One multistate value controls the off/low/medium/high setting.

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 Power Supply

  • 24 VDC 10 W supply that can be used to power the host controller.
  • Wide input range from 100–277 VAC.
  • Saves space when there is no room for a transformer in a wiring bay.

Optional Inputs

  • Up to two thermistor or dry-contact inputs.

Optional Relays

  • Up to five 5 Amp 347 VAC line-wire-switched mechanical relays.

Optional Solid-State Relay

  • One 15 Amp 347 VAC solid-state relay.
  • Two flying leads to separate from other relays.
  • Zero cross switched.
  • Solid-state relay is pulse-width modulated 0%-100% over a 4-second duty cycle to modulate electrical loads.

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

Technical specifications

Supply Voltages

  • 5 VDC @ 20 mA from controller to SMART-Net.

Inputs on -2 Models

  • Two thermistor or dry-contact inputs.
  • 12-bit A/D converter.

Wiring Terminals for Low Voltage

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

Wiring Terminals for Line Voltage

  • 16-inch flying lead 14 AWG (2.08 mm2) stranded core for relays, ground, and power connection.
  • Color-coded wires.


  • Up to five latching mechanical relays 24–347 VAC 5 Amp. -PS models have a maximum switch voltage of 277 VAC.
  • 5 Amp resistive load: 100,000 cycles.
  • 1/2 HP load.
  • Range on/off.
  • Zero cross controlled.
  • -F option uses three relays.

Relay Load UL/cUL Rating

  • -PS model: 277 V 5 Amp resistive or 277 V 0.5 HP.
  • Other models: 347 V 5 Amp resistive or 347 V 0.5 HP.
  • Maximum 5 Amp per relay.

Fan Speed Control on -F Models

  • Connects to line-voltage-switched fan speed.
  • Range off/low/medium/high.

Solid-State Relay on -SSR Models

  • 0%–100% range.
  • Duty cycle period is 4 seconds with 0%–100% duty.
  • 15 Amp, 347 VAC.

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.

Hand/Off/Auto on -H Models

  • Up to five 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.

Power Supply on -PS Models

  • 24 VDC 10 W power supply to power a host controller.
  • Powers host controller only.
  • Powered from input 100-277 VAC 50/60 Hz 0.25 Amp, connected by black and white flying leads.
  • Connected to power source with 14 AWG flying leads.

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.

UL/ULc Ratings for -PS Models

  • 100–277 VAC.


Inputs and Outputs

Line voltage control

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 DC, 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.