Ajax Security Integration: Relays, API and Smart Home Scenarios
For integrators specifying Ajax on a wider smart-home or BMS project: the security logic and certification stay on the Ajax hub, while relay modules and the Ajax API give you a clean, documented way to connect that logic to lighting, ventilation and third-party platforms.
How the integration layer is structured
Security logic on the hub
Detection, verification and arming/disarming logic run on the Ajax hub (Hub 2, Hub 2 Plus or Hub Hybrid) and stay there — that's what carries the EN 50131 Grade 2 certification many Ajax devices hold.
Relay modules bridge to your circuits
Relay modules in the Ajax range let a security event switch an external circuit directly — lighting, ventilation or a utility shutoff — without routing through a third-party controller.
Ajax API / Home Assistant as a layer on top
Ajax's own API is the supported path for third-party integration; a Home Assistant integration exists in the wider ecosystem for visualisation and cross-platform automation, sitting on top of Ajax's own app control, not replacing it.
Configure in PRO, hand over in Security System
Installers configure the system in the Ajax PRO app; the end user arms, disarms and monitors in the separate Security System app — the same split we document for the client at handover.
Where relays and integration earn their place
Jeweller open-field range
Ajax's proprietary wireless protocol is rated for up to roughly 2 km line-of-sight — real-world indoor range is always lower and depends on walls and building materials, which we account for at design stage.
Alarm-triggered lighting scenes
A relay output fires a lighting circuit or scene the moment an alarm event is confirmed — useful for deterrence and for orienting occupants during an event.
MotionCam events feeding your automation flow
MotionCam's photo verification (delivered via Wings) helps a user or monitoring station confirm an alarm is real before acting on it — that same verified event can also feed a wider automation or notification flow, reducing false-alarm response rather than eliminating false alarms.
Leak and smoke detection tied to shutoff relays
A confirmed leak or smoke event can trigger a relay to cut a water or gas supply, or drop power to a circuit — a direct hardware response independent of any third-party platform being online.
Home Assistant as a visualisation and cross-platform layer
Where a project already runs Home Assistant for other systems, an Ajax integration in that ecosystem gives operators one dashboard — the same layered pattern we use for KNX and Modbus elsewhere in the catalogue.
Fibra wired devices alongside Jeweller wireless
On a Hub Hybrid, wired Fibra detectors and modules run alongside wireless Jeweller devices on the same hub — useful where cabling already exists or where a hardwired detector is specified.
What we deliver as your engineering partner
We design the relay and integration layer around your project, not around a generic template.
- Relay and wiring schematic for lighting, ventilation and shutoff circuits
- Hub and device selection matched to the site (wireless Jeweller, wired Fibra, or Hub Hybrid)
- Panel assembly to IEC 61439 where Ajax components sit alongside other switchgear
- Ajax API / Home Assistant integration scoped and documented as an add-on layer
- Handover documentation covering PRO app configuration and Security System app use
Frequently asked questions
Does Home Assistant replace the Ajax hub?
No. Security logic, arming/disarming and certification stay on the Ajax hub. Home Assistant, where used, sits on top as a visualisation and automation layer — the same pattern as our KNX and Modbus integrations.
Can Ajax switch lighting or ventilation directly?
Yes, through relay modules in the Ajax range — a confirmed event can switch an external circuit directly, without needing a third-party controller online.
Does MotionCam eliminate false alarms?
No. Photo verification helps a user or monitoring station confirm an alarm is real before acting on it, which reduces false-alarm response — it doesn't guarantee zero false alarms.
Wireless Jeweller or wired Fibra — which do we specify?
Jeweller gives fast, flexible wireless installation with an open-field range of roughly 2 km, lower indoors depending on walls. Fibra is the wired alternative, useful where cabling already exists or a hardwired detector is required. Hub Hybrid runs both.
Can the system dispatch to a monitoring station?
Ajax hubs can connect to a professional 24/7 monitoring station via the operator's monitoring software for alarm dispatch — we scope that connection during design, operator-specific.
Planning an Ajax integration into a wider system?
Send us the site scope and any existing platforms (KNX, Modbus, Home Assistant) and our engineers will size the relay and integration layer with you.