4 × high voltage non-latching relays.
General purpose relay control.

The RY4 module features 4 × 250V AC 5A non-latching relays. Perfect for general purpose relay control applications.

Simple to use.
Open protocol.

As with all CommandFusion products, our communication protocol is open and available to anyone. Relay modules have very simple commands for setting the relay states on, off, toggling and pulsing. » View CFLink Protocol Docs

Need more relay ports?
Just get another module.

The beauty of the modular controllers is their flexibility. Need more of a specific port? Get another module and plug it in.

Detachable terminals
for convenience.

The RY4 module uses detachable screw terminal blocks for wire connections. This allows for convenient removal.


The RY4 module features 4 high voltage (250V AC, 5A) relay ports, and comes with detachable screw terminal blocks for secure connections to external relay-controlled devices. Plug it into a modular controller to add relay control ports to your system.

Power On States

Each relay port can be configured to be in open, closed or resume last state on power up. Using the resume option, they will return to their open or closed state after a power loss.

Extended Functionality

Most relay control systems out there allow you to set relays on or off, and require complex programming on a control processor to perform anything else. Our relay control protocol includes additional functionality such as a simple toggle command (so that you don't have to keep track of the relay state for basic toggle actions) and a pulsing command to pulse the relay closed for a time period, then opening again (of course, the time period is customisable as part of the protocol). Relay control has never been so easy.

GalleryHigh res photos in downloads section

Technical SpecificationsSee hardware documentation for more details

Module Connector 24-pin connector to connect to modular controller unit
Relay 1-4 4 sets of detachable 3-pin screw terminal blocks (included) consisting of 4 normally-open relay channels
Wire range: 28-14 AWG
Relay Rating: 250V AC 5A
Top Panel
Clip Secures and releases the module from the modular controller unit.
Label Model and serial number information.
Power Consumption Power usage 500mW maximum, powered by modular controller DIN-MOD4 or MOD4 (not included)
Enclosure Polycarbonate with dark grey matte finish
Height 32.8mm (1.29in)
Width 40mm (1.57in)
Depth 68mm (2.68in)
Weight 0.07kg (0.15lbs), Shipping 0.2kg (0.44lbs)
Environmental & Regulatory
Temperature 5°C to 45°C (41°F to 113°F)
Humidity 20% to 85% RH, non-condensing
Certification FCC, CE, C-Tick
Warranty 5 years limited warranty

Downloads & Documentation


Quick Reference Guide
Modules Quick Reference Guide includes details for all of our modules, such as pinout diagrams and general connectivity details.

Product Spec Sheet
Single page specification sheet.

Application Diagrams

Residential Application Diagram - Whole House
Residential - Whole House
Typical whole home automation diagram

download PDF
Commercial Application Diagram - Boardroom
Commercial - Board Room
Typical board room automation diagram.

download PDF

High Resolution Photos

Coming Soon...