Relays
ControlByWeb® devices with relay outputs are one of the most versatile and widely used within the ControlByWeb lineup. Whether you’re switching lights, controlling HVAC equipment, or restarting remote devices, relays offer a reliable, low-maintenance solution. Click here to learn more about relays on ControlByWeb devices.
-
X-410™ | Edge Programmable Controller
Price range: $299.99 through $399.99VIEW PRODUCTView Product This product has options that may be chosen on the product pageThe X-410™ is a versatile industrial I/O controller with four relays, four digital inputs, and one temperature input, designed for reliable edge control. Its built-in web server allows for efficient deployment and its embedded GUI logic builder enable event-driven or scheduled automation without external software or licensing fees.
Through peer-to-peer communication, the X-410™ can seamlessly expand with other ControlByWeb® devices, making it an efficient choice for system integrators and OEMs who need scalable, protocol-ready control in demanding environments.- 4 Relays & 4 Digital Inputs
- Up to 16 Temperature Sensors
- Ethernet, Cellular, or WiFi
- 9-28VDC and/or POE
Cellular and WiFi are Now Available. Note that X-410CW and X-410W models include cellular and WiFi capability respectively, which allows for more flexibility for your application.
Global Cellular Coverage. Discuss international cellular options with a sales engineer.
[frequentlyBought ids="7624,34491,7540,7798"]
-
WebRelay™ | Single Relay & Input Module
Price range: $189.99 through $289.99VIEW PRODUCTView Product This product has options that may be chosen on the product pageThe latest WebRelay™ is engineered for industrial reliability and flexible deployment. With updated firmware and optional Wi-Fi or cellular connectivity, it delivers robust remote relay control at the edge of your system.
A streamlined browser-based interface and open REST API provide seamless integration with PLCs, SCADA platforms, and IIoT applications—without licensing fees or vendor lock-in. Whether deployed as a stand-alone controller or part of a larger automation network, WebRelay™ offers dependable performance in commercial, industrial, and OEM environments. Note: This is the updated WebRelay. See the original WebRelay here.- 1 Relay & 1 Digital Input
- Ethernet, Cellular, or WiFi
- 9-28VDC and/or POE
Cellular and WiFi are Now Available. Note that X-WR-441CW and X-WR-441W models include cellular and WiFi capability respectively, which allows for more flexibility for your application.
Global Cellular Coverage. Discuss international cellular options with a sales engineer.
[frequentlyBought ids="7624,7621,7798,34091"]
-
WebRelay-Quad™ | 4 Web-Controlled Relays
Price range: $209.99 through $309.99VIEW PRODUCTView Product This product has options that may be chosen on the product pageThe WebRelay-Quad streamlines relay control with powerful yet accessible options, including a conditional and scheduled logic builder with intuitive drop-down menus, seamless open API integration via your own software, or communication using industrial protocols like MQTT and Modbus TCP/IP. Note: This is the new WebRelay-Quad. See the original WebRelay-Quad here. - 4 Relays
- Ethernet, Cellular, or WiFi
- 9-28VDC and/or POE
Cellular and WiFi are Now Available. Note that X-WR-444CW and X-WR-444W models include cellular and WiFi capability respectively, which allows for more flexibility for your application.
Global Cellular Coverage. Discuss international cellular options with a sales engineer.
[frequentlyBought ids="7624,7621,7793"]
-
X-401™ | Dual Relay and Input Module
Price range: $269.99 through $369.99VIEW PRODUCTView Product This product has options that may be chosen on the product pageThe X-401™ combines two SPDT (Form C) relays with two optically isolated inputs in a compact, industrial-grade module. As part of the 400 Series, it features a browser-based interface, embedded GUI logic builder, and open protocols (Modbus, MQTT, SNMP, REST) for seamless integration with SCADA, PLC, and IIoT systems.
Ideal for applications such as process monitoring, equipment reboot, and alarm control, the X-401™ provides a reliable edge-control solution that eliminates licensing fees and reduces integration complexity.- 2 Relays & 2 Digital Inputs
- Ethernet, Cellular, or WiFi
- 9-28VDC and/or POE
Cellular and WiFi are Now Available. Note that X-401CW and X-401W models include cellular and WiFi capability respectively, which allows for more flexibility for your application.
Global Cellular Coverage. Discuss international cellular options with a sales engineer.
[frequentlyBought ids="7624,7621,7798,34091"]
-
Original WebRelay™ | Single Relay & Input Module
Price range: $169.99 through $199.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe original WebRelay™ offers exactly what its name suggests, a web-controlled relay with a simple browser-based GUI. It is an electromechanical relay featuring a built-in web server and optically isolated input that can be used to monitor dry contacts or control industrial and commercial equipment. 1 Relay
1 Digital Input
Note: This is the original WebRelay. See the new WebRelay with the latest 400 series firmware.[frequentlyBought ids="7624,7621,7798,34091"]
-
Original WebRelay-Quad™ | 4 Relay Module
Price range: $189.99 through $219.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageRemotely 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
Note: This is the original WebRelay. See the new WebRelay-Quad with the latest 400 series firmware.[frequentlyBought ids="7624,7621,7793"]
-
X-412™ | 4‐Channel Relay & Analog Input Module
Price range: $369.99 through $469.99VIEW PRODUCTView Product This product has options that may be chosen on the product pageThe X-412™ is an Ethernet-based I/O controller with four high-resolution analog inputs and four relays, engineered for precise monitoring in industrial and OEM applications. Its browser-based interface and embedded GUI logic builder enable event-driven automation, scheduling, and data acquisition—without external software or licensing fees.
Functions as a stand-alone monitoring device with support for open protocols (Modbus, MQTT, SNMP, REST), the X-412™ integrates seamlessly into SCADA and PLC systems, providing a reliable and scalable solution for process monitoring, equipment control, and facility automation.- 4 Relays
- 4 Analog Inputs
New Cellular Option: The X-412CW model includes a cellular modem, compatible with our cellular data plans.
WiFi is Now Available. The X-412CW model includes WiFi capability which allows for more flexibility and cost savings for your application.
Global Cellular Coverage. Discuss international cellular options with a sales engineer.[frequentlyBought ids="7624,7916,34491,7781"]
-
X-432™ | Advanced I/O Controller
$629.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-432™ is a standalone, Ethernet-based controller with 38 onboard I/O points, designed for demanding industrial and OEM applications. Its browser-based interface and embedded GUI logic builder allow engineers to configure complex event-driven automation, scheduling, and monitoring tasks—without external software or recurring licensing fees.
Supporting open protocols including Modbus, MQTT, SNMP, and REST, the X-432™ integrates seamlessly into SCADA and PLC systems. With both local and remote control capabilities, it delivers scalable performance for applications requiring reliable, high-density I/O at the edge.- 16 Relays
- 18 Digital Inputs
- 4 Analog Inputs
- Up to 16 Temperature Sensors
[frequentlyBought ids="7621,34491,7540,7798"]
-
X-400™ | Modular I/O Controller
Price range: $299.99 through $399.99VIEW PRODUCTView Product This product has options that may be chosen on the product pageTThe X-400™ is a scalable Ethernet-based controller that supports up to 32 local expansion modules or remote ControlByWeb® devices through peer-to-peer communication, enabling systems with up to 64 I/O points. Its browser-based interface and embedded GUI logic builder provide event-driven automation for powerful turn-key solutions and seamless integration with SCADA and PLC platforms—without licensing fees.
X-400C™ – Cellular-Enabled Model
The X-400C™ adds a built-in cellular modem, extending the same modular control and integration capabilities to remote or distributed applications.
- Expandable, Up to 64 I/O
- Relays, Analog & Digital Inputs
- Up to 16 temp sensors
- Cellular version available
Global Cellular Coverage. Discuss international cellular options with a sales engineer.
[frequentlyBought ids="7635,34491,7624,7577"]
-
X-600M™ | Web-Enabled I/O Controller
$549.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-600M™ is ControlByWeb’s most advanced controller, built for large-scale industrial and OEM applications. Supporting up to 64 expansion modules and 1,024 I/O points, it’s engineered for high-density, complex systems.
With an embedded logic builder, LUA scripting for advanced control, and support for multiple customizable dashboards, the X-600M™ gives engineers powerful tools for automation and visualization. Open protocol support (Modbus, SNMP, peer-to-peer) ensures seamless integration with SCADA and PLC systems, delivered without licensing fees or proprietary lock-in.- Expandable, Up to 1,024 I/O
- Relays, Analog/Digital/Thermocouple Inputs
- Up to 32 Temperature Sensors
- GUI Dashboard
[frequentlyBought ids="7635,7621,7318,7289"]
-
X-420™ | Instrumentation-Grade Data Acquisition
Price range: $369.99 through $399.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-420™ is a versatile industrial controller with software-programmable digital I/O that can be configured as either inputs or outputs, giving engineers flexibility to adapt the module to a wide range of applications.
It can operate as a stand-alone device with its embedded GUI logic builder and browser-based dashboards, or integrate seamlessly with SCADA, PLC, and IIoT systems using open protocols. Ideal for process monitoring, facility automation, or OEM equipment, the X-420™ delivers adaptable control without licensing fees or vendor lock-in.4 Analog Inputs
2 Digital I/O
Up to 16 Temperature Sensors
[frequentlyBought ids="7621,34491,7916,7781"]
-
WebRelay-10 Plus™ | Industrial Grade Remote Relay Control
$549.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe WebRelay-10 Plus™ delivers reliable remote control with ten individually controlled 15A electromechanical relays, engineered for industrial and commercial applications. With a built-in web server, open API, and seamless integration into SCADA, PLC, and IIoT environments, it enables secure control and monitoring without licensing fees or proprietary software.
Its rugged design and straightforward configuration make the WebRelay-10 Plus™ a dependable choice for system integrators, OEMs, and facility engineers needing scalable relay control at the edge.- 10 Relays (Independent Form-C SPDT)
- 2 Digital Inputs
- Up to 16 Temperature Sensors
- 1/4″ Tab Connectors
[frequentlyBought ids="7624,7621,7793,34491"]
-
WebSwitch Plus™ | Remote Power Switch
Price range: $319.99 through $329.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe WebSwitch Plus™ provides IP-based control of two independent AC outlets, designed for managing critical devices in industrial, commercial, and OEM environments. With worldwide compatibility (100–240V AC, 50/60Hz) and a secure browser-based interface, it offers reliable remote power cycling, reboot, and monitoring—without licensing fees or proprietary software.
Engineered for seamless integration into automation networks, the WebSwitch Plus™ helps system integrators and engineers reduce downtime, simplify maintenance, and extend control to edge devices.- 2 Relay-Controlled Power Outlets (10A)
- 2 Digital Inputs
- Up to 16 Temperature Sensors
[frequentlyBought ids="7795,7587,7558,34491"]
-
X-11S™ | High-Current Relay Expansion Module
$179.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-11S™ adds two 20A Form-C (SPDT) relays to an X-400™ or X-600M™ controller, providing rugged, high-current switching for demanding industrial and OEM applications. Terminated through heavy-duty screw terminals, it is designed for reliable operation in environments where durability and load capacity are critical.
Multiple X-11S™ modules can be connected to the host controller via ribbon cable, which supplies both power and communication, enabling scalable relay expansion without additional wiring complexity.2 High-Current Relays
Expansion Module for the X-400 or X-600M
[frequentlyBought ids="7635,"]
-
X-12S™ | 8 Relay Expansion Module
$179.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-12S™ adds eight Form-A (SPST) relays to an X-400™ or X-600M™ controller, providing reliable low-current switching for industrial and OEM applications. Each relay is rated at 2.5A, with commons grouped in two banks for simplified wiring.
A removable terminal connector streamlines installation, while the ribbon cable connection supplies both power and communication from the host controller. Multiple X-12S™ modules can be added for scalable relay expansion in larger systems.8 Relays
Expansion Module for the X-400 or X-600M
[frequentlyBought ids="7635"]
-
X-17S™ | 4 Relay, 4 Input Expansion Module
$179.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-17S™ adds four Form-A (SPST) relays and four optically-isolated digital inputs to an X-400™ or X-600M™ controller, making it a versatile expansion option for both control and monitoring. Relays are designed for moderate load switching, while optical isolation ensures electrical separation between field equipment and low-voltage control circuits—improving safety and reducing interference.
Multiple X-17S™ modules can be connected via ribbon cable for power and communication, enabling scalable expansion. Typical applications include equipment control, alarm panel monitoring, pump or fan management, and facility automation.4 Relays
4 Digital Inputs
Expansion Module for the X-400 and X-600M
[frequentlyBought ids="7635,7798,34091"]
-
X-18S™ | 10 High-Current Relay Expansion Module
$309.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-18S™ adds ten high-current relays to an X-400™ or X-600M™ controller, each rated at 15A with Form-C (SPDT) contacts for maximum flexibility in switching. Connections are made directly to the relays through rugged ¼″ tab terminals, ensuring reliable performance in demanding environments.
Designed for industrial and OEM applications, the X-18S™ is ideal for controlling motors, pumps, fans, lighting, and other high-load equipment. Multiple modules can be connected to the host controller via ribbon cable for both power and communication, enabling scalable expansion for large systems.10 High Current Relays
Expansion Module for the X-400 and X-600M
[frequentlyBought ids="7635,7696"]
-
X-19S™ | Multi-Purpose I/O Expansion Module
$389.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-19S™ is a versatile expansion module for the X-400™ and X-600M™ controllers, combining 16 relays, 16 optically isolated digital inputs, and 4 analog inputs in a single unit. Screw terminal strips provide secure, industrial-grade connections for all I/O points.
As a high-density module, the X-19S™ is ideal for applications that require large-scale control and monitoring in a compact footprint, such as building automation, process control, and OEM equipment. Multiple X-19S™ units or other expansion modules can be connected via ribbon cable to scale I/O capacity as needed.16 Relays
16 Digital Inputs
4 Analog Inputs
Expansion Module for the X-400 and X-600M
[frequentlyBought ids="7635,7696,34091,7916"]
-
X-20S™ | 6 Relay, 6 Digital Input Expansion Module
$309.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-20S™ adds six high-current relays and six optically isolated digital inputs to an X-400™ or X-600M™ controller. Each relay is rated for heavy-duty switching with Form-C (SPDT) contacts, while the isolated inputs provide reliable status monitoring with electrical separation from control circuits.
Connections are made through rugged screw terminal strips, ensuring secure wiring in industrial environments. Multiple X-20S™ modules or other expansions can be added via ribbon cable for scalable system growth. Typical applications include pump and fan control, equipment monitoring, and facility automation.6 Relays
6 Digital Inputs
Expansion Module for the X-400 and X-600M
[frequentlyBought ids="7635,7798,34091,7876"]
-
X-21S™ | Relay Form C / SPDT Expansion Module
$179.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe X-21S™ adds four Form-C (SPDT) relays, each rated at 2.5A, to an X-400™ or X-600M™ controller. Designed for light-duty switching, it provides reliable control in applications where smaller loads need to be managed efficiently.
Multiple X-21S™ modules can be connected via ribbon cable, which supplies both power and communication, enabling scalable relay expansion in larger systems.4 Form-C/SPDT Relays
Expansion Module for the X-400 or X-600M
[frequentlyBought ids="7635"]
-
WebRelay Wireless™ | Single Relay & Input Module
$219.99VIEW PRODUCTView Product This product has multiple variants. The options may be chosen on the product pageThe WebRelay Wireless™ combines an electromechanical relay and optically-isolated digital input with secure Wi-Fi connectivity, eliminating the need for additional hardware or middleware. Its on-device web server and open API make configuration and integration straightforward, whether you’re extending SCADA systems, deploying remote monitoring, or embedding control into OEM equipment.
Designed for industrial and commercial environments, WebRelay Wireless™ provides a compact, reliable solution for edge control—without licensing fees or vendor lock-in.- 1 Relay (12A 277VAC, 30 VDC)
- 1 Digital Input (4-26 VDC)
- Up to 4 Temperature Sensors (-67°F to 257°F / -55°C to +125°C)
[frequentlyBought ids="7624,7540,7798"]
Smart Relays with Simple No-Code Logic
Remote Relays | Ethernet / Network Relays | WiFi Relays | Cellular Relays | Peer-to-Peer Communication
Ethernet-capable smart relays designed to be extremely reliable for monitoring and control of industrial equipment. We feature a variety of I/O products, such as the original WebRelay™, a networked relay with one digital input and one relay originally developed in 2005. Since then, we’ve been making top-of-the-line products for industrial automation, data collection, and device monitoring.
Many of our products include various inputs and outputs such as relays, digital inputs, analog inputs, 1-Wire bus for monitoring temperature and humidity, etc. that can be used with our built-in software to remote control/monitor electrical devices. Our latest (400 Series) I/O products support email notifications, scheduling, logging, BASIC interpreter, communication with a variety of protocols—including MQTT and Modbus—and many more features. Each features a truly Open API, ready to integrate with any industrial system.
Browser-Based User Interface
Our products have a built-in web server that allows I/O to be monitored or controlled with a standard web browser. No software needed.
Simple No-Code Programmable Logic
Each of our latest IoT controllers (400 Series) feature an easy-to-use user interface with drop down menus to build conditional and scheduled events. The menu system lets you build impressively powerful if/then logical events. These smart relays are capable of many monitoring and control tasks in industrial settings.
Integration Ready
Our smart relays are ready to integrate with your system. They feature an open API (HTTP) as well as popular, open industrial protocols such as MQTT (regular and Sparkplug B) and Modbus TCP/IP. You won’t find any walled gardens here.
ControlByWeb Cloud Compatible
We’ve made remote access and control even easier with the ControlByWeb Cloud. Enjoy easier access, cloud-based logging, dashboards, reports, and optional parent/child accounts. For more information, visit our cloud page.
Note: Our IoT controllers do not require connection to our cloud service, which is important to us. There are no forced subscriptions to worry about. The controllers will work with any cloud system through our open API, or through our very own cloud API.
Features
- Browser based UI
- Email/Text alerts
- Custom Logic – No programming required
- Control relays based on preset thresholds
- Networking options: Ethernet, WiFi, Cellular
- Configurable control and status web page
- MQTT (Regular and Sparkplug B)
- Open API (HTTP)
- Modbus/TCP support
- Password protected
- Rugged, DIN rail, or wall-mount enclosure
- Power supply options: 9-28 VDC and/or POE