Introduction: What the Ajax Relay Jeweller Is and Why It Matters
Ajax Relay Jeweller (Dry‑contact, 7–24V)is a compact wireless dry‑contact relay module designed to add remote control and automation capabilities to Ajax security and automation systems. Small enough to fit inside a junction box or appliance enclosure, the Relay provides potential‑free (galvanically isolated) contacts that let you switch inputs or circuits safely and reliably. With adjustable operating modes, robust switching capability and the secure Jeweller two‑way RF protocol, this device is aimed at installers, integrators and end users who need a dependable way to control locks, gates, pumps, lighting inputs or reboot network equipment from an Ajax hub.
- Potential‑free (dry) relay contacts— electrically isolated from the device power supply, ideal for interfacing with sensitive control inputs.
- Flexible power— operates from 7–24 V DC (12 V or 24 V recommended), with over‑voltage and temperature protection.
- Two operating modes— bistable (on/off) and Pulse (adjustable 0.5–255 s) for momentary activations.
- Robust switching— up to 5 A for DC circuits (to ~36 V) and up to 13 A at 230 V AC (mains switching by qualified electricians only).
- Secure wireless comms— Ajax Jeweller encrypted protocol with configurable polling (12–300 s) and up to ~1,000 m open‑space range (region dependent).
- Compact and install‑friendly— fits inside junction boxes, enclosures or DIN holders and includes anti‑sabotage features.
Detailed specifications and benefits
The technical design of the Ajax Relay Jeweller prioritises safety, flexibility and reliability. Below are the core specifications followed by the practical benefits they deliver.
- Dimensions:39 × 33 × 18 mm — a small footprint that makes the Relay easy to hide inside enclosures or behind panels.
- Weight:25 g — lightweight for neat, unobtrusive installations.
- Ingress rating:IP20 — intended for indoor, enclosed installation; do not expose to weather.
- Operating temperature:−20 °C to +64 °C;Humidity:up to 85% non‑condensing.
- Power supply:7–24 V DC (12 V or 24 V recommended). The device reports supply voltage and features over‑voltage protection.
- Maximum switched load:5 A up to ~36 V DC; 13 A at 230 V AC. Observe local wiring regulations and use a qualified electrician for mains work.
- Relay service life:Approximately 200,000 switching cycles — suitable for frequent operation over many years.
- Pulse duration:Adjustable between 0.5 and 255 seconds — useful for gate openers, buzzers or momentary control inputs.
- Protocol:Ajax Jeweller — two‑way encrypted RF communications for secure, low‑latency control and supervision.
- Frequency & range:Region‑dependent frequency bands (examples include 866/868/915–926 MHz families) and up to ~1,000 m open‑space range depending on environment.
- Polling interval:Configurable between 12–300 s to balance responsiveness and battery/network load.
These specifications translate into tangible benefits: galvanic isolation protects sensitive equipment by keeping control circuits electrically separate from the relay power supply; adjustable pulse timing and bistable mode allow the Relay to meet a wide variety of control scenarios; and the robust switching ratings mean it can handle many typical control tasks without additional contactors (subject to local wiring practice).
Use cases and scenarios where the Ajax Relay excels
The Ajax Relay is particularly well suited to situations where remote activation of a control input is required without creating direct electrical connections between circuits. Typical use cases include:
- Electric strikes and magnetic locks: Use the Relay to trigger lock inputs from the Ajax hub for scheduled releases, remote unlocking or integration with alarm events.
- Automatic gates and barriers: Provide momentary outputs for open/close commands or integrate with intercom systems to grant remote access.
- Pumping and valve controls: Remotely start/stop pumps or actuate control inputs on industrial devices while the galvanic isolation helps prevent ground loop issues.
- Lighting control inputs: Interface with lighting control panels where a dry contact triggers scenes or circuits without tying the Ajax device power to the lighting system.
- Router or network equipment reboots: Use the pulse mode to momentarily cut power to network devices via a relay‑controlled outlet or power module (ensure correct wiring and rated switching components).
- Hidden installations: Its compact size allows the Relay to be installed behind switches, inside distribution boards or in junction boxes where space is limited.
- Multi‑site deployments: The secure RF link and solid range capability make it practical to control distant equipment where running new control wiring would be costly.
Comparisons with similar products on the market
When evaluating the Ajax Relay against other wireless relays or smart relays, several distinguishing factors emerge:
The Relay provides potential‑free contacts, which is an advantage when you need to interface with inputs that must stay electrically isolated from the control device. Many consumer smart relays provide switched mains outputs or require common grounds; the Ajax Relay avoids those constraints and is often safer for integration with control panels or professional access control systems.
Ajax uses its proprietary Jeweller protocol, designed for secure, two‑way supervision and robust range. Compared to Wi‑Fi or generic RF relays, Jeweller offers a focus on low‑power, high‑reliability links suitable for security systems. Compared with Zigbee or Z‑Wave devices, the Ajax Relay’s integration into the Ajax ecosystem and its proven performance in alarm/automation contexts can be a decisive advantage for professional installations.
Some smart relays are powered directly from mains and are rated for household installation without an enclosure; the Ajax Relay is intended to live inside an enclosure (IP20) and requires proper wiring practices, especially when switching mains circuits. While that adds an installation step, it also means the Relay can be neatly integrated into professional electrical installations and service panels.
With ≈200,000 switching cycles and up to 5 A DC / 13 A AC switching capability, the Relay targets medium‑duty applications. For very high current or inductive loads, a contactor or additionally rated relay may still be required — similar to many compact relays on the market.
Customer feedback and installer impressions
While specific customer reviews vary by supplier and region, installers and integrators commonly report the following themes when working with the Ajax Relay:
- "Easy integration with Ajax hubs — adds control points without complex wiring changes."
- "Galvanic isolation makes it safe to connect directly to control inputs on older access systems."
- "Compact size is perfect for retrofits where space is limited inside junction boxes or panels."
- "Reliable RF link in typical suburban installations — actual range depends on building materials and local environment."
These statements are representative of typical installer feedback and should be taken as general impressions rather than verbatim endorsements. Prospective buyers should consult supplier reviews or seek a demonstration for assurance in their specific environment.
Conclusion: Why the Ajax Relay Jeweller is a strong choice
The Ajax Relay Jeweller is a versatile and professionally oriented dry‑contact relay that fills an important niche for remote control and automation within Ajax systems. Its potential‑free contacts, flexible power input range, adjustable pulse/bistable modes and secure Jeweller communications make it suitable for access control, equipment automation and retrofit projects where electrical isolation and reliable wireless control are essential.
For installers and integrators, the Relay offers a compact, robust solution that simplifies adding remote control points without extensive rewiring. For end users, it enables remote management of locks, gates, pumps and other equipment through the Ajax ecosystem, improving convenience and control while maintaining safety through galvanic isolation.
If you are looking for a small, secure, and professional dry‑contact relay for indoor installation, the Ajax Relay (RELAY - 38204.19.NC1) at a suggested price of $38 is a compelling option. Always follow local electrical regulations, install the device inside an appropriate enclosure, and consult a qualified electrician for mains wiring and compliance checks before commissioning.
