X-18S™ | 10 High-Current Relay Expansion Module

$309.99

The 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

Frequently Bought Together
Expansion Cable
Expansion Cable
Expansion Bus Power Injector
Expansion Bus Power Injector


In Stock, Ready to Ship

Heavy-Duty for Line Voltage and High Currents

The X-18S is suitable for use with heavier loads that require line voltages and high currents such as pumps, motors, lights and heaters. Attach multiple X-18S modules or a combination of expansion modules to the X-400 or X-600M for an I/O combination that is tailored to your specific needs.

See All Expansion I/O

X-18S Features

  • 10 Isolated relays (15Amp, SPDT)
  • Relay Functions: On, Off, Pulse
  • Relay Connectors: 1/4″ tab connectors
  • 11 LEDs for relays and power
  • Power Supply: 9-28 VDC (24V recommended)

X-18S Master Devices

  • X-400™ | Modular I/O Controller

    X-400™ | Modular I/O Controller

     Price range: $299.99 through $399.99
    TThe 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"]

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  • X-600M expandable I/O controller

    X-600M™ | Web-Enabled I/O Controller

     $549.99
    The 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"]

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Let our Sales Engineers identify the right solution for your application.

 

Specifications

Power Requirements
  • Voltage: 9-28 VDC (24V recommended)*
  • Max Current: See table below for typical values at 25°C.
Power Supply All Relays OFF All Relays ON
9 VDC 18 mA 1200 mA
12 VDC 14 mA 880 mA
24 VDC 11 mA 450 mA

Relay Contacts
  • Number of Relays: 10
  • Max Voltage: 277VAC, 30VDC
  • Max Current: 15A
  • Contact Type: SPDT (Form C)
  • Load Type: General Purpose
  • Contact Resistance: < 30 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)
Connectors
  • Expansion Connector: Ribbon cable, 2×5-position, polarized 0.100″ pitch
  • Relays: 1/4″ tab connectors
LED Indicators
  • Number of LEDs: 11
    • Power on
    • Relays 1-10
Physical
  • Size:
    • 8.60in (218.44mm) wide
    • 4.95in (125.73mm) tall
    • 2.46in (62.48mm) deep
  • Weight: 20 oz (566 g)
  • Enclosure Material: PVC
  • Enclosure Flame Rating: UL94 V1
Environmental
  • Operating Temperature: -40°F to 150°F (-40°C to 65.5°C)
  • Storage Temperature: -40°F to 185°F (-40°C to 85°C)
  • Humidity: 5-95%, non-condensing
  • Altitude: Up to 2,000m
  • Indoor use or NEMA-4 protected location
Electromagnetic Compliance
  • IEC CISPR 22, CISPR 24
  • FCC 47CFR15 (Class B)
  • EN55024 ITE Immunity (2010)
  • EN55022 Emissions (2010)

Manuals & Downloads

X-18S Users Manuals (PDF)

X-18S Data Sheet (PDF)

ControlByWeb Product Catalog

Other Downloads

X-18S 3D Model (.stp)

Accessories

 

Cloud Seat Icon

ControlByWeb Cloud Device Seat

$11.99

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Expansion Cable

Expansion Cable

$10.00

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For your convenience we have set up a live X-600M unit connected to its expansion modules (i.e., X-11S, X-12S, X-13S, X-15S,and X-16S) 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 the expansion modules’ relays, and view the current status of the inputs, and monitor temperature (X-600M & X-13S) through its dashboard page.

X-332™

Digital Input Control Page

X-600M™

Control Page Setup Pages*

*Setup page login information:

Username: admin

Password: webrelay

X-600M 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.

Schedule Free Consultation

 

Low on time? Watch a pre-recorded demo instead:

X-600M Setup and Programming Demo

X-600M Setup

The diagrams illustrate how this demonstration is wired. The relays on all expansion modules are not connected to a load; however, you can still access and control the relays by turning them on or off through the X-600M dashboard. The X-600M is also wired to a temperature sensor, and the X-13S is connected to a thermocouple. Both sensors can be monitored on the X-600M’s dashboard. The digital input states on the X-15S only changes when a voltage is applied to the inputs. For this demonstration, we have connected one of our X-332 controllers to Input 1 on the X-15S. You can apply a voltage to this input by accessing the control page for the X-332 (Digital Input Control Page).

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.

Related Products…

  • WebRelay-10 Plus - 10 high-current relays

    WebRelay-10 Plus™ | Industrial Grade Remote Relay Control

     $549.99
    The 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
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    • 1/4″ Tab Connectors

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400 Series Guided Demo

Self-Guided, Live Demo of our Products

SETUP PAGES

Use the Setup Page to set up I/O, change settings, and create logic with intuitive dropdown menus.

CONTROL PAGE

Use the Control Page to see I/O status and manually control relays.

*Setup page login information: Username: admin Password: webrelay

Schedule A Guided Walkthrough

Want a little extra guidance? Schedule a 15-minute guided demo with our sales engineers. They’ll show you how it works for your application.