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        Learn more by watching our GT Smoke Alarms GT240L | 240V Mains Smoke Alarm | Rechargeable Lithium Backup video.

        GT Smoke Alarms | GT240L 240V Photoelectric Smoke Alarm 85dB | 10-Year Rechargeable Lithium Backup

        The GT Smoke Alarms GT240L is a 240V mains-powered photoelectric smoke alarm with a built-in 10-year rechargeable lithium battery backup. It uses a split-spectrum photoelectric sensor and sounds at 85dB(A) measured 3 metres from the alarm. The GT240L is certified to AS 3786:2014 and EN 14604:2005+AC:2008, and carries a CSIRO ActivFire listing. Up to 24 units interconnect by cable.

        Battery-only alarms fail the way every sparky has seen: a flat cell, a chirp at 2am, and a call-back that pays nothing. The GT240L runs off 240V mains with a sealed 10-year rechargeable lithium backup, so there is no cell to change. The split-spectrum photoelectric sensor samples smoke concentration every 10 seconds, cutting the nuisance trips that dust and shower steam cause. Hardwired interconnection of up to 24 units puts the whole house on one trigger.

        On a compliance upgrade the GT240L ceiling mounts and lands on the existing 240V alarm circuit. The central test and silence button gives the occupant one control, and the infrared remote silence function means a burnt-toast alarm gets quietened without a ladder. Fault and low-battery states report through a colour-coded LED sequence, so a service call diagnoses at a glance. Ten years of backup removes the annual battery change from the maintenance schedule.

        Features

        • 240V mains power — runs on AC 100V to 250V at 50 or 60Hz, covering Australian mains supply on a standard alarm circuit.
        • 10-year rechargeable lithium backup — a sealed lithium cell charges from the mains and holds the GT240L live through a power outage, with no annual battery swap.
        • Split-spectrum photoelectric sensor — reads smoke across more than one wavelength on a 10-second sampling cycle, cutting false alarms compared with a single-wavelength chamber.
        • 0.2 to 0.3 dB/m alarm threshold — the alarm response threshold sits between 0.2 and 0.3 decibels per metre of smoke obscuration.
        • 85dB(A) sounder at 3 metres — sound output of at least 85 decibels measured 3 metres away, with visual and audible signalling together.
        • Hardwire interconnection to 24 units — up to 24 interconnected alarms sound in unison from a single detection when linked by cable.
        • Wireless interconnection option — the GT240L accepts an optional GT wireless interconnect module for up to 24 wirelessly linked devices.
        • Test and silence push button — a central button tests the alarm and silences it for 9 minutes, with infrared remote silence also supported.
        • Colour-coded LED status — green stays lit on standby, red flashes once per second in alarm, and yellow flags a sensor fault or low backup battery.
        • Indoor use only — rated for indoor installation between minus 10 and plus 55 degrees Celsius at up to 95 percent relative humidity, non-condensing.
        • CSIRO ActivFire listed — certified to AS 3786:2014 and EN 14604:2005+AC:2008, with CE and UKCA marking on the GT240L.

        Where to use

        • Bedrooms and sleeping areas — the GT240L mounts in bedrooms where a smouldering fire needs picking up before flame develops.
        • Hallways connecting bedrooms — corridor positions tie sleeping areas to the rest of the dwelling on the same interconnected network.
        • Living areas and multi-storey homes — each storey carries its own alarm, with up to 24 units sounding together from one detection.
        • Apartments and units — the GT240L suits strata dwellings where interconnected mains-powered alarms are specified across the floor plan.
        • New builds and alarm upgrades — mains-powered alarms replacing battery-only units during a compliance upgrade or a full rewire.
        • Rental properties and pre-sale work — a sealed 10-year backup removes the battery-change visit between tenancies.

        The GT240L is rated for indoor installation only and is not suitable for outdoor positions or damp areas beyond the 95 percent non-condensing humidity limit. It is a photoelectric smoke alarm, so it does not detect heat, carbon monoxide, or gas. Service outside the minus 10 to plus 55 degrees Celsius range falls beyond the alarm's specification.

        (GT240L)

        Smoke Alarm Calculator (Australia)

        It is a 240V mains powered photoelectric smoke alarm with a built-in 10-year rechargeable lithium battery backup for protection during power outages.

        It uses a split-spectrum photoelectric sensor designed to detect smoke quickly while reducing nuisance alarms from dust or steam.

        Yes. The built-in rechargeable lithium battery provides backup power for up to 10 years.

        Yes. It supports hardwired interconnection with up to 24 alarms so all units sound when one detects smoke.

        Yes. A large central button allows easy testing and temporary silencing, with optional infrared remote silence support.

        Yes. Sparky Direct stocks the GT Smoke Alarms GT240L with fast dispatch and fast delivery Australia wide.

        100-Day Fuss-Free Returns
        We want you to love what you buy—but if you change your mind, that’s okay too. That’s why Sparky Direct offers a 100-day money-back guarantee.

        • Items must be unused, with all parts, accessories, and original packaging.
        • We can’t accept returns if the product is damaged, incomplete, or not in resalable condition.
        • Proof of purchase is required.
        • Return shipping is the responsibility of the customer. 

        If your item isn’t in its original condition, please contact us before returning it—we might save you time and money.


        All products come with a manufacturer’s or supplier’s warranty

        • Warranty starts from the Invoice Date
        • Some suppliers offer in-home warranties and handle claims directly, so you won’t need to uninstall or return the product. Chat with us to check if your product qualifies.
        • Sparky Direct isn’t responsible for losses caused by product failure.
        • Warranties are void if products aren’t installed by a licensed electrician.

        Damaged or Faulty Goods
        If your order arrives damaged or is faulty, let us know within 24 hours.

        • Sparky Direct will pay for return shipping via an emailed return label.
        • If the fault is confirmed, we will send you a replacement item or provide a refund.

        Contact us via our chat to arrange the return.


        Exclusions
        We can’t accept returns for:

        • Items that have been installed, modified, or used
        • Clearance, End of life, Discontinued, or special order items (unless faulty)
        • All PPE Items
        • Goods returned without original packaging or proof of purchase

        How to Request a Return

        1. Contact our customer service team with your order number.
        2. Confirm it’s eligible under our return or warranty policy.
        3. Pack the item securely and return it using a trackable service.
        4. Once we receive and inspect it, we’ll process your refund or replacement.

        Warranty starts from Invoice Date

        Domestic Use: 10 Years
        Commercial Use: 10 Years
        Warranty Method: Return to Sparky Direct

        These specifications and characteristics outline physical, mechanical, electrical details.

        Brand GT Smoke Alarms
        SKU GT240L
        Model # GT240L
        Barcode # 9309001770037
        Package Weight 0.400kg
        TYPE VALUE
        Type Smoke Alarm
        Brand GT Smoke Alarms
        Colour White
        Height (mm) 55.5
        Mounting Ceiling
        Diameter (mm) 148.6
        Battery Backup 10 Year Lithium (Rechargeable)
        Power Supply 240V
        Number of Interconnected Units Up to 24

        Electrical and HVAC products sold by Sparky Direct are intended for installation by licensed and appropriately qualified professionals in accordance with applicable Australian Standards and regulatory requirements. Customers are responsible for ensuring that any product purchased, including any related or associated components, is compatible and suitable for their intended installation and application.

        Sparky Direct does not provide installation advice and does not assess product suitability for individual circumstances unless expressly confirmed in writing. Customers must confirm correct product selection, compatibility, compliance, and suitability with a licensed or appropriately qualified professional prior to purchase.

        Tools sold by Sparky Direct must be used safely and in accordance with the manufacturer’s instructions. Customers are responsible for ensuring they have the necessary knowledge and competence to operate any tool purchased. If you are unsure how to safely or correctly use a tool, do not use it and seek guidance from the manufacturer or a suitably qualified professional.

        Nothing in this clause limits or excludes any rights or guarantees available under the Australian Consumer Law.

        For website terms and conditions https://www.sparkydirect.com.au/terms-of-use

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