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AJAX - RELAY SWITCH 12V DC WIRELESS DRY CONTACT
A-RELAY12V

AJAX – RELAY SWITCH 12V DC WIRELESS DRY CONTACT

AJAX Relay Switch 12V DC Wireless Dry Contact

The AJAX Relay Switch is a wireless relay module for 12V DC circuits. It lets a wireless security system switch an external device on or off through a dry contact, so the alarm can control equipment that sits outside its own set of sensors and sirens.

A dry contact is a simple switch with no voltage of its own. When the relay changes state, it opens or closes the connection between two terminals, which allows the device to be wired into existing equipment such as gates, lights, sirens or other 12V devices. The module runs from a 12V DC supply, so it fits installations where a 12V source is already available.

Because the relay communicates wirelessly, it can be placed where cabling is difficult or impossible to run. This makes it useful for retrofit projects, extensions to an existing alarm installation and sites where a wired connection would be costly or disruptive to install.

Typical uses include triggering a door strike or gate opener, switching lighting when an alarm event occurs, controlling a ventilation or heating unit, or sending an external signal. Installers and integrators can use the relay to extend the reach of a security system beyond its standard components.

Before installation, check that the electrical load of the connected device is within what the relay can handle and that the power supply matches the specification in the product documentation. Keep the module within range of the system hub and follow local wiring regulations.

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AJAX Relay Switch 12V DC Wireless Dry Contact

AJAX - RELAY SWITCH 12V DC WIRELESS DRY CONTACT

The AJAX Relay Switch 12V DC Wireless Dry Contact is a relay module designed to add switching control to a wireless alarm system. Its dry contact output allows the system to open or close a circuit that powers or controls another device, making it a practical link between the alarm and equipment on site.

Unlike a standard sensor or siren, a relay switch takes action. When the system sends a command, the relay changes state and the connected device responds. Because it works without a wired connection to the alarm panel, it suits sites where running new cables would be difficult, expensive or disruptive.

Key features

  • Wireless communication with the AJAX alarm system
  • Designed for 12V DC operation
  • Dry contact output with no voltage of its own
  • Compact module for discreet installation
  • Suitable for controlling external 12V devices

How a dry contact works

A dry contact is a switch that is either open or closed. It does not supply power to the connected device, so the external equipment must have its own power source. This makes the relay flexible: it can switch loads of different types as long as they stay within the relay’s rated limits. Installers should always confirm the maximum load before connecting a device.

Typical uses

  • Opening or closing a door strike or electric gate
  • Switching lights on when an alarm event occurs
  • Controlling ventilation, heating or other building equipment
  • Activating an external warning signal
  • Integrating third-party devices into a wireless security setup

Each of these uses depends on the connected equipment and the rules of the site. Where the relay is used to control access or safety-related equipment, the installation should be planned carefully and checked against local requirements.

Installation considerations

Place the relay within the wireless range of the system hub and avoid locations with heavy metal obstruction or strong interference. Confirm that the 12V DC supply matches the product documentation before powering up. Wire the dry contact terminals to the device being controlled, and make sure the wiring is protected from weather and tampering where needed.

Test the complete chain after installation. Trigger the relay from the system, confirm that the connected device responds correctly and check that the status is reported as expected. Repeat the test after any change to the system or the connected equipment.

Who it is for

The relay is intended for installers, integrators and technically experienced users who want to extend an AJAX wireless alarm system into building control or access tasks. It is also useful for retrofit projects where the existing wiring is limited or where the alarm needs to interact with equipment already on site.

Whether used for a single gate or a larger automation project, the relay gives the security system a practical way to act on events rather than only report them.

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