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Learn more by watching our LEGRAND 643092 | SMOKE ALARM MAINS WIRED FLUSH LITHIUM BATTERY 240V video.
The Legrand 643092 is a photoelectric smoke alarm rated for mains-powered operation at 240V with a 10-year sealed lithium battery backup. It is designed for flush ceiling mounting under AS 3786:2014 and detects smoke from slow-burning fires before visible flame develops.
Mains-wired smoke alarms are commonly retrofitted in homes undergoing electrical upgrades, renovation work, and new residential construction where hardwired interconnection is specified. The 643092 replaces the discontinued 643087 model while retaining the same 90mm flush-mount base and plug-in connector, eliminating the need to alter existing wiring or ceiling brackets.
Licensed electricians specify the 643092 for homes where interconnection improves fire safety across multiple rooms and floors. The wired-only design suits retrofit jobs where existing wiring infrastructure is already in place, and the flush-mount finish avoids the visual profile of surface-mounted alarms. The 10-year lithium battery and photoelectric sensor provide consistent protection without annual battery changes or complicated commissioning.
"Great quality smoke alarms, have been using Legrand for many years." — Steve S, verified purchaser ★★★★★
"Nicely designed for ten year life." — Steve, verified purchaser ★★★★★
"Great product, easy to install." — Anonymous, verified purchaser ★★★★★
"Neat and easy install." — Tony, verified purchaser ★★★★★
The Legrand 643092 is not suitable for external walls, damp environments, spray zones, or outdoor installation. It is rated for indoor residential and commercial ceilings only and should not be installed in bathrooms, laundries, kitchens at counter level, or any location exposed to moisture or water ingress.
(643092)
Photoelectric technology detects visible particles of combustion, making it highly responsive to smouldering fires and dense smoke. This provides early warning of slow-burning fires before visible flame develops, giving occupants more time to react and evacuate safely.
The 643092 is mains-wired to 240V household power and includes a sealed 10-year lithium battery backup. If mains power fails, the battery automatically powers the alarm, ensuring protection during power outages without requiring annual battery changes.
Yes. The Legrand 643092 is designed for flush-mount installation with a standard 90mm ceiling hole cut-out (the same size as a downlight). Ceiling clamps accommodate a range of board thicknesses, and the alarm sits fully recessed in the ceiling for a clean, low-profile finish.
The 643092 can be wired to interconnect with up to 20 other mains-powered alarms. When one alarm detects smoke, all interconnected units sound simultaneously, alerting occupants throughout the home. This wired-only interconnection suits homes where ceiling wiring infrastructure is already in place.
Installation must be carried out by a licensed electrician where required by state electrical regulations. The 643092 is mains-wired to the power circuit and ceiling-mounted; it is not a battery-only unit and does not suit DIY installation. A licensed installer will confirm correct circuit protection and compliance with AS 3786:2014.
This alarm comes with a 5-year warranty covering manufacturing defects under normal domestic and commercial use, starting from the invoice date. Some suppliers offer in-home warranty service; contact Sparky Direct to confirm if in-home support is available for your purchase.
The alarm has a large test and hush button on the front. Press and hold for 3 seconds to trigger it and verify operation. LED indicators show AC power (green), battery status (green), and alarm activation. If lights are off or red, the unit may need servicing; contact a licensed electrician.
The Legrand 643092 is available online from Sparky Direct, with Australia-wide delivery to any state or territory including regional areas. Sparky Direct is an Australian electrical wholesaler established in 2005, supplying more than 500,000 customers with transparent trade pricing.
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Warranty starts from Invoice Date
Domestic Use: 5 Year
Commercial Use: 5 Year
Warranty Method: Return to Sparky Direct
These specifications and characteristics outline physical, mechanical, electrical details.
| Brand | Legrand |
| SKU | 643092 |
| Barcode # | 9321001511496 |
| Package Weight | 0.315kg |
| TYPE | VALUE |
|---|---|
| Type | Smoke Alarm |
| Brand | Legrand |
| Colour | White |
| Height (mm) | 25 |
| Power Source | 240v with 10 Year Rechargeable Battery |
| Mounting | Flush Mount |
| Installation Area | Indoor |
| Battery Type | 10 Year Rechargeable Lithium |
| Main Power Source | Yes |
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.
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