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A wireless dry contact relay that switches up to 13 A at 110-230 V AC, or 5 A at 24 V DC, controlled from the Ajax app or by an automation scenario. It is how an Ajax system operates something that is not an Ajax device.
Built for the installer
Because the contact is dry and independent of the load, it drives gates, lighting circuits, heating, door strikes and signalling inputs on third-party equipment. Pulse mode with a duration from 0.5 to 255 seconds covers momentary functions like a gate trigger, and bistable mode covers anything that latches.
Voltage protection cuts the relay out below 6.5 V or above 36.5 V, and temperature protection trips over 149F at the installation site or 185F inside the relay. Those are the protections that stop a fault condition turning into a fire. The DIN Holder accessory mounts it on a 35 mm DIN rail.
Key features
- 13 A at 110-230 V AC or 5 A at 24 V DC, enough for lighting circuits and gate operators
- Dry contact independent of the load, so it drives third-party equipment directly
- Pulse mode from 0.5 to 255 s plus bistable, covering momentary and latching functions
- Voltage and temperature protection that cuts out automatically on a fault condition
- Normally open or normally closed contact state, configurable
- DIN rail mountable with the DIN Holder accessory
System requirements
Requires an Ajax hub or range extender. Powered from 7-24 V DC. The relay does not supply power to connected devices. Cable 22-14 AWG.
Specifications
| SKU | AJ-42837 |
|---|---|
| Brand | AJAX |
| Radio communication range | Up to 3,250 ft in open space, between the device and a hub or range extender |
| Power input | 7-24 V DC. The relay does not supply power to connected devices |
| Energy consumption | Up to 1 W in standby |
| Maximum resistive load | Up to 5 A at 24 V DC, up to 13 A at 110-230 V AC |
| Maximum inductive or capacitive load | Up to 3 A at 24 V DC, up to 8 A at 110-230 V AC |
| Cable cross-section | 0.75-1.5 sq mm (22-14 AWG) |
| Voltage protection | Cuts out below 6.5 V or above 36.5 V |
| Temperature protection | Over 149F at the installation site, or over 185F inside the relay |
| Operation modes | Pulse (0.5 to 255 s) or bistable |
| Contact state | Normally open or normally closed |
| Related accessory | DIN Holder for 35 mm DIN rail mounting |
| Dimensions | 1.54 x 1.3 x 0.71 in |
| Device weight | 0.88 oz |
| Region | 9NA, North America model |
| Radio protocol | Jeweller, two-way encrypted wireless |
| Frequency band (North America) | 905.0-926.5 MHz, certified to UL/ULC standards |
| Radio modulation | GFSK with frequency hopping |
| Encryption | Block encryption with a dynamic key |
| Communication loss detection | After 36 seconds |
| Anti-spoofing | Device authentication |
| Warranty | 24 months |
| Frequency | Jeweller |