Ajax FireProtect 2 AC (Heat/Smoke): wireless smoke and heat detector
Detects smoke and heat and sounds an alarm immediately with an 85 dB siren. The dual-spectrum smoke chamber ignores steam and vapour and works wirelessly on 230 V mains power with backup. Link several detectors so that they sound together; with an Ajax hub you also receive the notification on your phone.
The Ajax FireProtect 2 AC (Heat/Smoke) is a wireless fire detector that you can use standalone or connect to your Ajax system. A blue and an infrared LED in the patented chamber recognise real smoke and are not fooled by cooking steam. This AC version runs on mains power (110-240 V) with a sealed backup battery, so it keeps working during a power failure. Because the mains connection is housed in the casing, this version is thicker than the battery versions: 122 x 122 x 54 mm compared with 124 x 124 x 45 mm for the RB and SB.
Why the FireProtect 2
Bispectral smoke sensor
Bispectral optical smoke chamber with a blue and an infrared LED. It distinguishes real smoke from steam and cooking fumes, so you get fewer false alarms.
Fast heat detection
Two thermistors trigger an alarm when the temperature rises above 64 °C, and also when it rises by 10 °C within one minute, regardless of how warm it is at that point. This means the detector also responds to fires that produce hardly any smoke.
Built-in 85 dB siren
Each detector has its own siren (85 dB at 3 m). In the event of an alarm you hear it immediately, including at the location of the detector.
230 V mains power (AC)
Permanently on 230 V mains power, with a sealed backup battery that takes over during a power cut. As a result, the housing is 54 mm deep, compared with 45 mm for the battery versions.
Wireless via Jeweller
Wireless connection via Jeweller (866-868 MHz, frequency hopping, up to 1700 m in open field). Links with other detectors and, with an Ajax hub, with the Ajax app.
Standalone or linked
Works standalone with its own siren. Link several detectors so that they sound the alarm together, and add an Ajax hub for notifications in the app and to the alarm receiving centre.
Mounted in 90 seconds
Click the detector onto the SmartBracket without opening the housing. The tamper contact reports opening or removal.
The FireProtect 2 AC (Heat/Smoke) in view
The AC version on the SmartBracket. Note the casing: it is deeper than on the battery versions, because the mains connection is housed in it.
Quick to install
Click the detector onto the supplied SmartBracket. This takes about 90 seconds and does not require opening the housing. A tamper switch alerts you as soon as someone opens or detaches the detector. If you use an Ajax Hub, add the detector in the Ajax app by scanning the QR code. For the AC version, connect 110-240 V to the WAGO-221 terminals. Route the mains cable neatly with the Ajax CableTrunk, which adds only 9.5 mm in height.
Technical specifications
| Detection | |
| Detector type | Wireless fire detector, bispectral smoke sensor + heat sensor |
| Smoke detection | Bispectral optical (blue + infrared) |
| Heat detection | Thermistors, alarm above 64 °C or on a rise of 10 °C within a minute |
| Siren | 85 dB at 3 metres |
| Power supply | |
| Power supply | 110-240 V mains power with sealed backup battery |
| Battery life | Runs on mains power, with a sealed backup battery during a power failure |
| Connection | |
| Wireless | Jeweller, 866-868 MHz with frequency hopping, up to 1700 m in open terrain |
| Operation | Standalone or interconnected; with an Ajax hub also app and alarm receiving centre |
| App and alarm receiving centre | Via an Ajax hub: Ajax Security System (iOS and Android), notification within 20 s |
| Housing | |
| Mounting | SmartBracket, within 90 seconds without opening the housing |
| Dimensions | 122 x 122 x 54 mm (9 mm thicker than the battery versions) |
| Weight | 315 g |
| Operating temperature | 0 to +50 °C |
| Colour | White or black |
| Certification | EN 14604:2005 |
How thick is the AC version compared with the battery versions?
The mains connection is housed in the casing, so the AC version is 9 mm deeper. The mounting surface and the SmartBracket are the same: it fits in the same place, but sits slightly further from the ceiling.
Specifications as stated by Ajax Systems. We do our utmost to keep the information on this page accurate and up to date, but a manufacturer may modify a model in the meantime and a typing error can never be entirely ruled out, so no rights can be derived from this information. In case of doubt, the Ajax Systems manual is leading; it contains all specifications. Do you see an error, are you missing something or are you unsure whether a feature is right for your situation? Let us know or ask before you order: we will look into it, update the page and thank you for it. If a product does not match what is stated here, we will put it right.
All FireProtect 2 detectors at a glance
The FireProtect 2 range differs in three respects: which hazards the detector senses (smoke, heat, carbon monoxide), the power supply (replaceable battery, sealed battery or 230 V mains power) and, as a result, the dimensions. All versions are shown side by side below.
| Model | Smoke | Heat | CO | Power supply | Battery life | Dimensions |
|---|---|---|---|---|---|---|
| FireProtect 2 (CO) | No | No | Yes | Choice: RB, SB or AC | Up to 10 years, your choice | RB/SB 86 x 86 x 44 mm, AC 122 x 122 x 54 mm |
| FireProtect 2 (Heat) | No | Yes | No | Choice: RB, SB or AC | Up to 10 years, your choice | RB/SB 86 x 86 x 44 mm, AC 122 x 122 x 54 mm |
| FireProtect 2 (Heat/CO) | No | Yes | Yes | Choice: RB, SB or AC | Up to 10 years, your choice | RB/SB 86 x 86 x 44 mm, AC 122 x 122 x 54 mm |
| FireProtect 2 RB (Heat/Smoke) | Yes | Yes | No | Replaceable battery (RB) | Up to 7 years, replaceable | 124 x 124 x 45 mm |
| FireProtect 2 RB (Heat/Smoke/CO) | Yes | Yes | Yes | Replaceable battery (RB) | Up to 7 years, replaceable | 124 x 124 x 45 mm |
| FireProtect 2 SB (Heat/Smoke) | Yes | Yes | No | Sealed battery (SB) | Up to 10 years, sealed | 124 x 124 x 45 mm |
| FireProtect 2 SB (Heat/Smoke/CO) | Yes | Yes | Yes | Sealed battery (SB) | Up to 10 years, sealed | 124 x 124 x 45 mm |
| FireProtect 2 AC (Heat/Smoke) | Yes | Yes | No | 230 V mains power (AC) | Mains power + backup | 122 x 122 x 54 mm |
| FireProtect 2 AC (Heat/Smoke/CO) | Yes | Yes | Yes | 230 V mains power (AC) | Mains power + backup | 122 x 122 x 54 mm |
Dimensions: there are three housings. With a battery-powered smoke sensor it measures 124 x 124 x 45 mm; without a smoke sensor (Heat, CO, Heat/CO) the detector is considerably smaller at 86 x 86 x 44 mm. Every AC version measures 122 x 122 x 54 mm, because the mains connection is inside the housing. If you replace a battery-powered detector with an AC version, allow for this difference.
Battery life is a figure stated by Ajax under ideal conditions, not a guarantee and not a minimum. How long a battery lasts for you depends on the temperature at the mounting location, the signal strength to the hub, the number of alerts and tests, and the battery itself. You should therefore expect that it may be shorter. The detector and the app warn you when the battery is low. With the RB, you replace the batteries yourself and the detector keeps working; with the SB and AC, the sealed battery cannot be replaced and you replace the whole detector at that point. For smoke detectors, the general advice is in any case to replace them after 10 years at the latest.
You can see prices and stock levels on each product page. The versions without a smoke sensor (Heat, CO, Heat/CO) are intended for rooms where an ordinary smoke detector would cause false alarms, such as a kitchen, boiler room or garage.
Which FireProtect 2 should you choose?
First decide what you want to detect in each room, then choose the power supply that suits the location.
Living room, bedroom, hallway
Here, smoke is the first sign of fire. Choose a Heat/Smoke version, or Heat/Smoke/CO if a combustion appliance is also nearby.
Kitchen, bathroom, boiler room
Steam and vapour cause false alarms with a smoke detector. The Heat version responds to heat only.
Boiler room, garage, near the open fireplace
Wherever a fuel is burned, carbon monoxide is produced. Choose CO or Heat/CO.
Replaceable battery (RB)
Battery you can replace yourself (2x CR123A, up to 7 years according to Ajax). The most frequently chosen version for the home.
Sealed battery (SB)
Built-in battery, up to 10 years according to Ajax. No maintenance required; afterwards you replace the whole detector.
230 V mains power (AC)
Permanently connected to the mains with sealed backup. For new builds or projects where cabling is mandatory. Every AC version measures 122 x 122 x 54 mm, regardless of the sensor set: for the smoke detectors it is 9 mm thicker, for the versions without a smoke sensor considerably larger. Conceal the cable with the CableTrunk.
Need a larger or EN 54-certified fire detection installation (office, hospitality, school)? Take a look at the Ajax EN54 Line.
Frequently asked questions
Do I need an Ajax hub for this?
Not necessarily. The detectors also work standalone: each detector has its own 85 dB siren and you can interconnect several detectors so that they raise the alarm together. If you want notifications on your phone via the Ajax app or signalling to an alarm receiving centre, you need an Ajax hub. We recommend at least a Hub 2: installation and configuration are simpler and you receive the notifications neatly in the app.
Does it raise a false alarm because of cooking fumes or steam?
Less quickly than a standard smoke detector. The bispectral smoke chamber (blue plus infrared) distinguishes real smoke particles from steam and vapour. For a kitchen or bathroom, a Heat version without a smoke sensor remains the safest choice.
How long does the backup battery last?
The detector runs on 230 V mains power, so the battery serves only as a backup during a power cut. Ajax states up to 10 years for that backup. This figure is an upper limit that Ajax measures under ideal conditions, not a minimum and not a guarantee: temperature, signal strength to the Hub and the number of alerts and tests shorten it in practice. The detector and the app warn you when the battery is low, so you will not be caught by surprise.
Is the AC version the same size as the battery version?
No. The AC version measures 122 x 122 x 54 mm, which makes it 9 mm thicker than the RB and SB versions (124 x 124 x 45 mm). This is because the mains connection with WAGO-221 terminals is inside the housing. The mounting surface and the SmartBracket are the same, so you can mount it in the same place; it simply sits slightly further from the ceiling.
Does it also warn the other detectors in the house?
Yes. You can interconnect several detectors, so that the alarm from one detector sets off the sirens of all the others. This also works without a hub. With an Ajax hub, you also receive a notification in the app within 20 seconds.
Is this a certified fire detector?
Yes. The smoke version complies with EN 14604. For EN 54-certified installations, use the Ajax EN54 Line.
In the box
Ajax FireProtect 2 AC (Heat/Smoke)
The fire detector itself, in white or black.
SmartBracket
Mounting plate for ceiling or wall.
Backup battery
sealed backup battery pre-installed
Mounting materials
Screws and wall plugs.
Documentation
Quick start guide and safety information.
Jordy Kloet (verified owner) –
Does what it should do