Ajax DoorProtect G3 Fibra Black Wired Opening, Shock & Tilt Detector

Ajax DoorProtect G3 Fibra Black - Wired Opening, Shock & Tilt Detector

The Ajax DoorProtect G3 Fibra in black is a Grade 3 wired detector built for doors, windows, skylights, showcases and vaults in high-risk commercial and residential installations. It combines dual reed switches, an accelerometer and a magnetometer to catch opening attempts, forced impacts, tilting and even attempts to fool the sensor with a fraudulent magnet. Connected to a Superior Hub Hybrid over the encrypted Fibra wired bus, it delivers instant, reliable alarm reporting without relying on radio signals, making it a strong fit for professionally installed security systems.

Key Features

• Dual reed switches so the magnet can be fitted on either the left or right side of the detector, with built-in protection against contact chatter.
• Magnetometer-based anti-masking that records the magnetic field during calibration and flags attempts to defeat the sensor with a spoof magnet.
• Built-in accelerometer for shock and tilt detection, so openable windows left in airing mode are still monitored.
• Third-party NC input lets installers wire in an existing normally closed detector, such as a motion or vibration sensor, to extend coverage.
• Secure Fibra wired protocol with encrypted, two-way communication and a bus cable run of up to 2,000 metres using standard U/UTP cat.5 cable.
• Chime function that pairs the detector with an Ajax siren to act as a shopkeeper's bell, alerting staff whenever a door opens while the system is disarmed.
• Grade 3 (EN 50131) and PD 6662:2017 compliance, suitable for higher-security commercial applications.
• Sleek matte black enclosure that blends discreetly with dark door and window frames.

Where It Fits In a Security System

This detector is designed for indoor use on entry doors, emergency exits, storage rooms, display cabinets, safes and window openings where a robust, tamper-resistant wired sensor is preferred over a wireless unit. Because it runs on the Fibra bus, it is well suited to large commercial fit-outs, retail premises and offices where dozens of detectors need fast, dependable polling and centralised management from a Superior Hub Hybrid.

What's in the Box

• DoorProtect G3 Fibra detector unit (black)
• Magnet
• Two mounting spacers
• Wired connector for a third-party NC detector
• Installation hardware and quick start guide

Frequently Asked Questions

Does this detector work wirelessly?
No. It is a wired device that communicates with a compatible Superior Hub Hybrid via the Fibra bus protocol, not over radio.

Can it be installed outdoors?
No, the DoorProtect G3 Fibra is designed for indoor use only.

Can I connect another sensor to it?
Yes, it has an input for a third-party normally closed (NC) detector, such as an existing motion or vibration sensor, letting you integrate it into the same Fibra line.