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


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

Tech Specs

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.

Application Diagram

Inputs and Outputs

Line voltage control

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.