Ajax Relay is a convenient tool to help automate processes at home and office. Our new device is designed to control appliances remotely and encourages experimenters and professional installers, whose customers are always asking about “smart home”.

Relay capabilities

Relay contacts can switch loads up to 5A with a range of 0-36 V DC, and in 110-230 V mains up to 3 kW. They are galvanically separated from the actual device, so they can be connected to input control circuits of various other devices, thus simulating a button or toggle switch. For 110-230 V mains, we recommend the time-tested WallSwitch.

The relay closes and opens contacts by the user’s command in the Ajax app or Button press. Also,users can configure Relay to switch on or off automatically in response to arming /disarming, alarm or schedule.

👉 How to create and configure a scenario in the Ajax security system

Aside from switching Relay states, the Ajax app allows user to monitor the power supply voltage of the relay and appliances connected via Relay — if they are powered from a single source. If the relay and appliance are powered from different power sources, only the relay voltage is displayed in the app. The app also displays the temperature level inside the Relay.

Since the housing of the device is relatively compact — 39 × 33 × 18 mm — the device fits easily in a junction box, switchboard or in the housing of switching devices. To fix the Relay on a DIN rail, we recommend using a DIN Holder.

Connection to single source


Connection to separate sources


Button/switch mode

Relay operation modes

For improved convenience, our Relay supports several relay modes of operation and various states of contact. They can be combined depending on user needs:

  • bistable, when the contacts close and open as a switch;
  • pulse, when the contacts close or open for a time from 0.5 to 255 seconds (or from 0.5 seconds to 4 minutes), and then automatically perform the opposite action.

Two-level protection

To avoid accidents and equipment failures, we equipped our Relay mechanism with protection against overheating and voltage surges. It is permanently enabled and can’t be disabled. If the temperature where the Relay is installed exceeds 65°C, or 85°C inside the device, the relay opens and sends out an alarm. As soon as the temperature returns to normal, the relay releases and sends out the respective notification.

There are two threshold values for the supply voltage: the lower value is 6.5V, and the upper value is 36.5V. If the power level is too high or too low, protection is activated, the device is disabled and a warning message is sent out. After the supply voltage parameters return to normal, the relay releases and notifies users.

How to use the Relay

Connect devices to our relay to never waste time on routine processes again. That means the Relay has a notable psychotherapeutic effect as well.

Gates and traffic barriers. Opened by a single click of Button or in the Ajax app, which means no more pesky key ring. The app is also password and fingerprint protected, so unauthorized persons can’t access it without your permission.

Roller blinds and curtains. Can be automatically opened and closed when people come home or leave for the office, or at specified time.

Electric locks. Locked when the system is armed, and opened after disarming. Checking that everything is locked has never been easier.

Routers. If network equipment is connected through the Relay, an unresponsive router can be restarted directly from your smartphone. The hub will even continue to operate through the GSM channel and intercept the connection via Ethernet after the router is restarted.

Electric valves. These valves help shut off water and gas supply automatically in case of an accident when you are away. They also disconnect utilities automatically when you go to work or on vacation.

More capabilities with scenarios

Ajax security system provides functionality for configuring the Relay reaction in response to an alarm, changing the security mode, or by schedule. You can also specify Relay reaction if Button in control mode is pressed.

Use scenarios to automate your security system and reduce the number of routine actions. For example, set up water shut-off in case of LeaksProtect flood detector alarm, scheduled heater activation, or automatic closing of the electric lock when arming.

👉 How to create and configure a scenario in the Ajax security system