Relay module Ajax Dry Contact Relay 000010019 — dry contact interface for alarm systems

Ajax Dry Contact Relay 000010019 is a compact relay module that provides a voltage-free (dry) contact interface for alarm and automation systems. Powered from a 7–24 V DC supply, the relay switches external circuits without supplying power to them, enabling integration with third‑party devices such as sirens, control panels, lighting controllers or other equipment that require a dry contact. The module supports remote switching via the Ajax app or browser and can operate as a button (pulse) or as a maintained switch.

Advantages

The unit works up to 1,000 meters from an Ajax Hub in open space and across several floors in typical commercial buildings. It provides protection against voltage surges and overheating, remembers settings after power loss, and uses an external antenna for improved reception. The relay offers long service life (up to 200,000 switchings) and low power consumption (<1 Wh). Communication uses the Jeweller protocol (868.0–868.6 MHz) with 25 mW radio power.

Suitable for

• Integrating sirens, external alarms, or notification devices with an Ajax security system
• Switching lighting circuits or controllers that accept dry contact inputs
• Controlling third‑party control panels or automation controllers requiring a voltage‑free contact
• Remote or pulse control of equipment via Ajax app or browser

Key specifications

• Actuator: Electromagnetic relay
• Supply voltage range: 7–24 V DC
• Maximum load current: 5 A at 36 V DC, 13 A at 230 V AC
• Output power (resistive load, 230 V): up to 3 kW
• Service life: 200,000 switchings
• Voltage protection: Yes (min 6.5 V, max 36.5 V)
• Temperature protection: triggers at >65°C at installation location or >85°C inside the relay
• Communication protocol: Jeweller (868.0–868.6 MHz), radio power 25 mW, modulation GFSK
• Maximum distance to Hub: up to 1,000 m (open space)
• Power consumption: <1 Wh
• Operating temperature: 0°C to +64°C
• Operating humidity: up to 75%
• Dimensions: 38 × 25 × 18 mm; Weight: 32 g
• Shell protection rating: IP20

How to use

Install the relay module inside junction boxes, electrical service panels or switchboard housings so the unit is protected from moisture and direct contact. Connect the 7–24 V DC supply and wire the dry contact terminals to the external device you want to control. Pair the module with an Ajax Hub using the Jeweller radio channel and configure the operating mode (pulse or maintained) and response check interval (12–300 seconds) in the app or web interface. Verify correct operation after installation and test the triggered outputs from the Ajax interface.

Recommendations

Use the relay only indoors and within the specified operating temperature and humidity ranges. Do not exceed the specified maximum load current and follow local electrical codes when installing inside service panels. Ensure the supply voltage stays within 7–24 V DC and provide adequate ventilation to avoid overheating.