Legrand cat 643 084
- Mains Powered
- Photoelectric
- 9 Volt Battery
HPM Legrand CAT 643084 has a strong install base in the past 6-8 years.
General Information
Surface mount Photoelectric PE240/9v Mains powered with a 9 volt backup battery.
COMMON ISSUES & EXPIRY
This model suffers from several design flaws, particularly:
- A loose latching mechanism that prevents the smoke alarm from securely attaching to the ceiling base.
- Poorly designed terminal point connections and overall layout inside the backup battery compartment.
These issues commonly result in:
- The unit feeling loose or unstable on the ceiling.
- Frequent beeping after a battery change, frustrating householders.
- Many customers requesting early changeover or replacement well before the standard 10-year expiry date.
We often describe this as a sloppy smoke alarm due to its unreliable mounting and compartment design.
How to Open
The Legrand CAT 643084 has a side based push button release. It will then unlatch on plastic hinges. Providing access to the battery compartment and label details.
Our Opinion
HPM are a reputable supplier. Unfortunately this particular model has persistent usability and reliability problems stemming from its design flaws. Based on its track record, customer feedback, and performance in real homes, we rate it 3 out of 10. We do not recommend it for new installations or replacements—most clients who have used it end up switching to better alternatives long before expiry.