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Ajax Door & Window Sensors

Ajax opening detectors report when a door or window opens, and this page adds glass-break and curtain detectors that watch the glazing and openings themselves. Choose wireless Jeweller models, such as the DoorProtect U and Superior DoorProtect, or wired Fibra models, such as the DoorProtect Fibra and DoorProtect Plus Fibra. SmartBracket mounting panels and magnet mounts are here as spares for DoorProtect detectors.

Choosing Ajax Door & Window Sensors

Decide between wireless and wired first, because a Jeweller detector talks to the hub by radio and a Fibra detector needs a cable run to a Fibra hub.

Door and window contacts

The DoorProtect U 121293.03.WH1 is a wireless Jeweller contact with a pre-installed CR123A battery, typical battery life up to 7 years and a radio range up to 1,200 m in open space; the 121294.03.BL1 is the black DoorProtect U. The Superior DoorProtect 133194.03.WH1 is a white Jeweller contact with a tamper switch and LED event indication. On the wired side, the DoorProtect Fibra 44393.03.WH1 has two reed switches so the magnet can sit on the left or right. The DoorProtect Plus Fibra adds shock and tilt sensing, with a line reach up to 2,000 m over U/UTP Cat.5.

Extra wired inputs

The DoorProtect Fibra, DoorProtect Plus Fibra, DoorProtect U and Superior DoorProtect all accept a third-party normally closed wired detector. The DoorProtect Fibra, the DoorProtect Plus Fibra and the black DoorProtect U 121294.03.BL1 do not power that external detector, so it needs its own supply.

Glass-break and curtain detectors

The GlassProtect S, GlassProtect U and GlassProtect Fibra listen for breaking glass with an electret microphone and the DualTone algorithm, covering up to 9 m with about 180° horizontal coverage. The Curtain Outdoor Jeweller 101441.289.WH1 is a narrow-beam detector for windows, doorways and fences, combining two PIR sensors with a 24 GHz K-band microwave, rated IP55, with an adjustable range of typically 8 to 12 m.

SmartBracket spares

The 9520.03.BL and 9521.03.WH SmartBracket panels let a DoorProtect be fitted without opening the detector and keep its tamper function, and the 22051.03.BL and 22053.03.WH hold the magnet half of a DoorProtect or DoorProtect Plus.

ModelTypeConnection
44393.03.WH1DoorProtect Fibra opening detectorWired Fibra
121293.03.WH1DoorProtect U opening detectorJeweller wireless, CR123A
133194.03.WH1Superior DoorProtect opening detectorJeweller wireless, CR123A
44396GlassProtect Fibra glass-break detectorWired Fibra
130351.05.WH1GlassProtect U glass-break detectorJeweller wireless, CR123A
101441.289.WH1Curtain Outdoor, PIR and K-bandJeweller wireless
9520.03.BLSmartBracket mounting panelSpare for DoorProtect

Related categories

See also Smart Motion & Door Sensors. Add motion detection from Ajax MotionCam and detectors, start a system with Ajax alarm kits, or browse the full Ajax security systems range.

Frequently asked questions

What battery does an Ajax door sensor use?

Wireless Ajax door sensors usually run on a CR123A battery, which comes fitted and can last several years in normal use. Wired Fibra versions need no battery because the hub powers them over the bus cable. The Ajax app can show a detector's charge level, so check it during routine maintenance. The range here includes wireless Jeweller and wired Fibra door contacts.

Can an Ajax door sensor be used on a garage door?

Yes, an Ajax door sensor can protect a garage door when the detector is fixed inside and the magnet lines up with it while the door is shut. Some models add tilt sensing, which can help on up-and-over doors. Metal doors and frames can weaken the magnet's effect, so test the gap before fixing anything permanently.

How do you open an Ajax door sensor?

To open an Ajax door sensor, first slide the detector off its SmartBracket mounting panel, which gives access to the casing and battery. Removing it usually raises a tamper alert, so warn anyone who receives the system's notifications beforehand. Check the maker's instructions for the release on your model, because the casing design can vary between versions.

What is an Ajax door sensor?

An Ajax door sensor is an opening detector that tells an Ajax alarm hub when a door or window opens. Inside, a reed switch reacts when the magnet fixed to the door or window moves away. Jeweller versions talk to the hub by radio, while Fibra versions connect by cable. The range here includes door contacts, glass-break detectors and SmartBracket mounting panels.

  • Established 1975
  • Birmingham trade counter
  • UK-only supply

Written by the West Midlands Electrics technical team

Updated

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