Relay User Manual


Relay is a wireless, low-voltage relay featuring potential-free (dry) contacts. Use Relay to remotely switch on/off appliances powered by a 7–24 V⎓ source. Relay can operate both in pulse and bistable mode. The device communicates with a hub via Jeweller radio protocol. In the line of sight, the communication distance is up to 1,000 m.

The Relay contacts are not galvanically connected to the device itself, so they can be connected to the input control circuits of various equipment to imitate a button, toggle switch, etc.

Relay is compatible only with Ajax hubs and does not support connecting via uartBridge or ocBridge Plus.

Use scenarios to program actions of automation devices (Relay, WallSwitch or Socket) in response to an alarm, Button press or schedule. A scenario can be created remotely in the Ajax app.

Functional Elements

ajax relay
  1. Antenna.
  2. Power supply terminal block.
  3. Contacts terminal block.
  4. Function button.
  5. Light indicator.
ajax relay
  • PS IN terminals — “+” and “” contact terminals, 7-24 V⎓ input power supply.
  • Relay terminals — output potential-free terminals.

Operating Principle

Regardless of the type of electrical circuit, only a qualified electrician should install Relay!

Relay is powered by a 7–24 V⎓ source. The recommended voltage values are 12 V⎓, and 24 V⎓. Use the Ajax Security System app to connect and set up Relay.

Relay has voltage and temperature protection: the contact will open when the voltage is beyond 6.5 – 36.5 V⎓, as well as when the temperature threshold reaches +85°C inside the device body.

Use the Ajax app to connect and set up Relay.

Relay features dry (potential-free) contacts. The contacts are not connected to the device galvanically so that Relay can imitate a button, switch, etc. in electrical circuits of various voltages (sirens, electrical valves, electromagnetic locks).

The miniature body makes it possible to install Relay inside a junction box, switchboard, or a switch.

Relay closes and opens the contacts by user command from the app or automatically by scenario.

Relay operation modes:

  • Bistable — Relay opens or closes contact and remains in this state.
  • Pulse — Relay opens or closes contacts for a pre-set time (from 0.5 to 255 seconds) then switches back to the initial state.

In pulse mode, Relay closes/opens contacts for a period of 0.5 to 255 seconds, after which the device automatically performs the reverse action.

Connecting to the hub

Before connecting the device:

  1. Switch on the hub and check its Internet connection (the logo glows white or green).
  2. Install the Ajax app. Create the account, add the hub to the app, and create at least one room.
  3. Make sure that the hub is not armed, and it does not update by checking its status in the Ajax app.
  4. Connect Relay to 12 or 24 V⎓ power supply.

Only users with administrator rights can add a device to the app

To pair Relay with a hub:

  1. Click Add device in the Ajax app.
  2. Name the device, scan it, or enter the QR code manually (located on the case and packaging), select the room.ajax relay
  3. Click Add — the countdown will begin.
  4. Press the functional button.

For detection and pairing to occur, the device should be located in the coverage area of ​​the hub’s wireless network (at the same object). The connection request is transmitted only at the moment of switching on the device.

If the device failed to pair, wait 30 seconds and then retry. Relay will appear in the list of hub devices.

The device statuses update depends on the ping interval set in the hub settings. The default value is 36 seconds.

When switching on for the first time, Relay contacts are open! When deleting Relay from the system, contacts open!


The states include information about the device and its operating parameters. Relay states are available in the Ajax app. To access them:

  1. Go to the Devices tab.
  2. Select Relay in the list.
Parameter Value
Jeweller signal strength

The signal strength of connection via Jeweller between the hub/range extender and the device. Recommended values: 2–3 bars.

Jeweller is the protocol transmitting events and alarms.

Connection via Jeweller The state of connection via Jeweller between the hub/range extender and the device:

  • Online — the smart plug is connected with the hub or the range extender.
  • Offline — no connection with the hub or the range extender.
ReX Displays the status of the device connection to the radio signal range extender:

  • Online — the device is connected.
  • Offline — no connection with the device.

The field is displayed if the device is operated through the radio signal range extender.

Active The relay state:

  • Yes — relay contacts are closed. The connected electrical appliance is energized.
  • No — relay contacts are open. No current is being supplied to the connected appliance.

The field is displayed if Relay operates in the bistable mode.


The current voltage value at the Relay input.

The frequency of value updates depends on the Jeweller settings. The default value is 36 seconds.

The voltage values are displayed in increments of 0.1 V.

Temporary deactivation Shows the state of the device temporary deactivation function:

  • No — the device operates normally, responds to commands, runs scenarios, and transmits all events.
  • Entirely — the device is excluded from the system operation. The device doesn’t respond to commands, doesn’t run scenarios, and doesn’t transmit events.

Learn more

Firmware Device firmware version.
Device ID Device identifier. Also available via the QR code applied to the device body and packaging.


To change the Relay settings in the Ajax app:

  1. Go to the Devices tab.
  2. Select Relay in the list.
  3. Go to Settings by clicking on the gear icon .
  4. Set the necessary parameters.
  5. Click Back to save the new settings.
Settings Value

Device name. It is displayed in the list of hub devices, texts of SMS and notifications in the event feed.

Click on the pencil icon to change the device name.

The name can contain up to 12 Cyrillic characters or up to 24 Latin characters.


Selection of the virtual room with the assigned Relay.

The room name is displayed in SMS and notifications in the event feed.

Relay mode The Relay operating mode selection:

  • Pulse — Relay generates a pulse of a specified duration when activated.
  • Bistable — Relay changes the state of the contacts to the opposite (e.g., closed to open) when activated.
Pulse duration

The pulse duration selection: 0.5 to 255 seconds.

The configuring is available when Relay operates in the pulse mode.

Contact state Selection of the normal state of the relay contacts:

  • Normally closed (NC) — the relay contacts are closed in the normal state. The electric appliance connected is supplied with current.
  • Normally open (NO) — the relay contacts are open in the normal state. The electric appliance connected is not supplied with current.

Opens the menu for creating and configuring automation scenarios.

Scenarios offer a brand-new level of property protection. With them, the security system not only notifies about a threat but also actively resists it.

Use scenarios to automate security. For example, switch on lighting at the facility when an opening detector raises an alarm.

Learn more

Jeweller Signal Strength Test

Switches the relay to the Jeweller Signal Strength Test mode.

The test allows checking the Jeweller signal strength and the stability of the connection between a hub or a range extender and a smart plug to choose the best place for installing the device.

Learn more

User guide Opens the Relay User Manual in the Ajax app.
Temporary deactivation

Allows temporarily disable the device without removing it from the system.

Two options are available:

  • No — the device operates normally, responds to commands, runs scenarios, and transmits all events.
  • Entirely — the device is excluded from the system operation. The relay doesn’t respond to commands, doesn’t run scenarios, and doesn’t transmit events.

After deactivation, Relay will keep the previous state: active or inactive.

Learn more

Unpair device Disconnect Relay from a hub and delete its settings


The Relay light indicator can light green depending on the device status.

When not paired with the hub, the light indicator blinks periodically. When the functional button is pressed, the light indicator lights up.

Functionality Testing

The Ajax security system allows conducting tests for checking the functionality of connected devices.

The tests do not start immediately but within a period of 36 seconds when using default settings. The test time start depends on the settings of the detector ping interval (the Jeweller menu in the hub settings).

Jeweller Signal Strength Test

Installation of the Device

Regardless of the type of electrical circuit, only a qualified electrician should install Relay. When installing and operating the device, follow the general electrical safety rules for using electrical appliances and the requirements of electrical safety regulations. It is strictly forbidden to disassemble the device.

The communication range with the hub in the line of sight is up to 1,000 meters. Take this into account when choosing the location for Relay.

If the device has a low or unstable signal strength, use a radio signal range extender.

Installation process:

  1. De-energize the cable to which Relay will be connected.
  2. Connect the grid wire to the Relay terminals according to the following scheme:

When installing Relay in the box, lead out the antenna and place it under the plastic frame of the socket. The bigger the distance between the antenna and metal structures, the lower the risk of interfering (and impairment) of the radio signal.

When installing outdoors, place the Relay in a sealed box. This will protect against the condensation, which can damage the device.

During the installation and operation of Relay, follow the general electrical safety rules and the requirements of electrical safety regulatory acts.

It is strictly forbidden to disassemble the device. Do not use the device with damaged power cables.

Do not install the relay:

  1. In metal wiring boxes and electrical panels.
  2. In places with temperature and humidity exceeding the permissible limits.
  3. Closer than 1 m to a hub.


The device does not require maintenance.

Tech Specs

Actuating element Electromagnetic relay
The service life of the relay 200,000 switchings
Supply voltage range 7 – 24 V⎓ (DC only)
Voltage protection Yes, min — 6.5 V⎓, max — 36.5 V⎓
Maximum load current* 5 A at 24 V⎓, 13 A at 230 V~
Operating modes Pulse and bistable
Pulse duration 0.5 to 255 seconds
Maximum current protection No
Parameter control Yes (voltage)
Device energy consumption Up to 1 W
Radio communication protocol


Learn more

Radio frequency band 866.0 – 866.5 MHz
868.0 – 868.6 MHz
868.7 – 869.2 MHz
905.0 – 926.5 MHz
915.85 – 926.5 MHz
921.0 – 922.0 MHz
Depends on the region of sale.
Compatibility Operates only with all Ajax hubs, and radio signal range extenders
Effective radiated power 3.99 mW (6.01 dBm), limit — 25 mW
Modulation of the radio signal GFSK
Maximum distance between the device and the Hub

Up to 1,000 m (any obstacles absent)

Learn more

Polling interval 12 – 300 s (36 s by default)
Protection class IP20
Operating temperature range From –20°С to +64°С
Max. temperature protection Yes, over +65°C at the place of installation or over +85°C inside the Relay
Operating humidity Up to 85% with no condensation
Dimensions 39 × 33 × 18 mm
Weight 25 g
Service life 10 years

If using inductive or capacitive load, the maximum commutated current decreases to 3 A at 24 V⎓ and to 8 A at 230 V~!

Compliance with standards

Complete Set

  1. Relay.
  2. Connecting wires — 2 pcs.
  3. Quick Start Guide.


Warranty for the AJAX SYSTEMS MANUFACTURING Limited Liability Company products is valid for 2 years after the purchase.

If the device does not function correctly, please contact the Ajax Technical Support first. In most cases, technical issues can be resolved remotely.

Contact Technical Support:

Phone number: 0 (800) 331 911

Need help?

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