WebRelay-Quad™ | 4 Web-Controlled Relays


Remotely control 4 electromechanical relays with the WebRelay Quad. The simple user interface and no-code logic builder makes this programmable logic controller the easiest relay control method you can find.

4 Relays

Frequently Bought Together

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  • Most products ship same day
  • 30-day return policy
  • Responsive technical support
WebRelay Quad Overview

The WebRelay-Quad makes relay control simpler than ever. Options include using our conditional and/or scheduled logic builder with easy drop-down menus, sending commands to the device from your own software, or via industrial communication protocols like Modbus TCP/IP.

WebRelay-Quad Features

  • Simple Web Dashboard
  • Password Protected
  • Automatic Reboot
  • Remote Relay Control

WebRelay-Quad Applications

  • Pump & Motor Control
  • Lighting Control
  • Network Device Rebooting
  • Security Lock Systems

Built on the 400 Series platform, the X-WR-444 includes useful features such as:

  • Email Notifications
  • No-Code Logic Builder
  • Peer-to-Peer Communication
  • Data Logging
Integration Icon

Integration Ready

We support MQTT, HTTP GET, XML, JSON, SNMP, Modbus TCP/IP, and our Cloud API with more on the way.

No-Code Logic Icon

No-Code Programmable Logic

Our intuitive Task Builder empowers you to build custom logic using drop-down menus in an if-this-then-that flow.

Peer-to-Peer Icon

P2P Networking & Remote I/O

Devices can directly communicate with each other to share I/O among ControlByWeb controllers, assign any device as master, set up multiple masters, and link remote inputs and relay control.

Email Notifications Icon

Email Notifications

Stay in control of operations with real-time monitoring. Add intelligence to your emails through programmable logic to instantly send notifications to the right people and eliminate false alarms.

Built-In Firmware Icon

Easy-to-Use Embedded UI

Our devices come with a simple embedded user interface that will enable you to easily monitor, manage, and control ControlByWeb PLCs from any standard web browser.

Data Logging Icon

Data Logging

Enjoy scheduled and conditional logging with email and FTP log exports. Add the optional ControlByWeb Cloud for remote access and downloadable logs.

Cloud Compatible Icon

Cloud Compatible

Enhance your capabilities with the ControlByWeb Cloud. Gain enhanced features such as simplified remote device access, data logging, and advanced analytics.

Security Icon

Trusted Device Security

Our controllers have no built-in OS or file system, making them less prone to vulnerabilities. Third-party consultants and government agencies test the cybersecurity of our controllers.

IIoT Icon

IIoT Monitoring & Control

Access the device directly through an assigned IP address. Set up your network settings the way you want, to limit or allow remote access through the cloud.

WebRelay Quad Case Studies



  • X-WR-4R3-I
  • X-WR-4R3-E
Power Requirements
  • Voltage:
    • X-WR-4R3-I: 9-28VDC
    • X-WR-4R3-E (Updated): POE class 0 (0.44–12.94 Watts)
  • Max Current:
    • X-WR-4R3-I: 320mA Max
    • X-WR-4R3-E: 477mA Max
Relay Contacts
  • Number of Relays: 4
  • Max Voltage: 28VAC, 24VDC
  • Max Current: 3A
  • Contact Type: SPDT (Form C)
  • Load Type: General Purpose
  • Contact Resistance: < 50 milliohms initial
  • Contact Material: AgSnO2
  • Electrical Life: 100K cycles (Typical)
  • Mechanical Life: 10M cycles (Typical)
  • Environmental Rating: Over voltage Category II, Pollution Degree 2
  • Relay Modes: ON/OFF or Pulse
  • Pulse Timer Duration: 0.1 to 86,400 Seconds (1-day)
  • Type: 10/100 Base-T Ethernet Port
  • Setup: Static IP address assignment. TCP port selectable
  • Power & Relays 1-4: 14-Position, 3.81mm terminal spacing, Removable. For 16-28 AWG wire.
  • Network: 8-pin RJ-45
LED Indicators
  • Number of LEDs: 7
    • Power on
    • Relay coil energized 1-4
    • Network linked
    • Network activity
  • Operating Temperature: -40°F to 150°F (-40°C to 65.5°C)
  • Size:
    • 1.41in (35.7mm) wide
    • 3.88in (98.5mm) tall
    • 3.1in (78mm) deep (not including connector)
  • Weight: 5 oz (142 grams)
  • Enclosure Material: Lexan 940 Polycarbonate Plastic
  • Enclosure Flame Rating: UL94 V0
  • HTTP, XML, Modbus TCP/IP
Password Settings
  • Password protection on setup page: Yes
  • Password protection on control page: Optional
  • Password Encoding: Base 64
  • Password Length: 10 Characters
Electromagnetic Compliance
  • IEC CISPR 22, CISPR 24
  • EU EN55024, EN55022
  • X-WR-4R3-I: FCC 47CFR15 (Class B)
  • X-WR-4R3-E (Updated): FCC 47CFR15 (Class A)
Product Safety Compliance
  • IEC 61010-1

Manuals & Downloads

Utilities & Sample Code

CBW Settings Utility

This utility allows you to download settings and/or events from one of our stand-alone ControlByWeb products to your computer, and then upload them to a device of the same model number, and firmware revision. (Not compatible with the X-600 Modular Series.)



12VDC International Power Supply

12VDC International Power Supply

24V DIN Rail Power Supply

24V DIN Rail Power Supply

Blue Ethernet Cable

Ethernet Cable

12VDC Power Supply

Power Supply | 12VDC

For your convenience we have set up a live WebRelay-Quad unit for testing and evaluation. By clicking the links below you have full access to this live unit. You can make changes to the configuration and settings through the setup pages and you can control WebRelay-Quad through its control page. The control page allows you to change the state of the relay and view the current state of the input.

Self Guided Demo With Login and Video

*Setup page login information:

Username: admin

Password: webrelay

WebRelay-Quad live demonstration setup

Live Demo With One of Our Sales Engineers

Let’s make it easy with a live demo and screen sharing.

Set up a one-on-one Q & A with one of our experts. We’ll help you find the best solutions for your next project and walk you through a demonstration.

WebRelay Series Setup and Programming Demo

WebRelay-Quad Setup

The diagram illustrates how this demonstration is wired. Nothing is connected to the relay contacts; however, you can still turn the relay on and off to see how it works. The input state only changes when a voltage is applied to the input. For this demonstration, we have connected one of our X-332 controllers to the input of the WebRelay-Quad. You can apply a voltage to the input of the WebRelay-Quad by accessing the control page for the X-332 (Digital Input Control Page). Important Info about devices resetting

Important Information

  • Multiple users may be accessing this device simultaneously so the device can change while you are using it.
  • This unit will be reset to factory defaults daily at 2:30AM MST.
  • Please DO NOT change network or password settings.

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