Siemens FDO421 S54320-F4-A1 Fire Alarm Smoke Detector (NEW IN BOX)
Siemens FDO421 S54320-F4-A1 Fire Alarm Smoke Detector (NEW IN BOX)
Condition: New
Out of stock
Storewide Quantity discount: Save 5% on 2 items, 8% on 3 items, and 10% on 4+ items (applies automatically at checkout).
Couldn't load pickup availability
You will be prompted to create an account or sign in to complete your purchase.
As an eBay Partner, we may be compensated if you make a purchase.
Siemens FDO421 S54320-F4-A1 Fire Alarm Smoke Detector - This advanced addressable fire alarm smoke detector provides highly reliable, multi-criteria sensing technology for commercial life-safety systems. - Operating voltage range of 13V to 33V DC - IP40 rated enclosure protection - Integrated ASAtechnology for precise fire detection - Operational temperature range from -25°C to 70°C - Low standby current consumption of 200 µA
The Siemens FDO421 represents a significant evolution in fire detection, offering improved stability and faster response times compared to previous generation analog smoke sensors. By utilizing advanced signal analysis algorithms, this unit minimizes the risk of false alarms while maintaining superior sensitivity to a wide range of combustion particles in complex environments.
Advanced Detection and System Performance
The FDO421 utilizes patented ASAtechnology (Advanced Signal Analysis), which allows the detector to adapt its sensitivity based on current environmental conditions to ensure high-performance fire monitoring. Its sophisticated internal architecture enables seamless integration into modern Cerberus PRO fire alarm control panels, providing building managers with real-time diagnostic data and precise location identification during an emergency.
This item description was generated using artificial intelligence and may contain errors. Specifications and compatibility should always be verified using official manufacturer documentation and, where applicable, by a qualified or licensed fire alarm technician.
View full details

About us
We specialize in new, used, and surplus fire alarm and life-safety equipment. Our inventory includes control panels, modules, power supplies, annunciators, detectors, and related accessories from leading manufacturers. Listings reflect current, in-stock availability and are updated regularly. Orders ship quickly and are packed with care.
For additional details, please review our Terms of Service, Shipping Policy and Refund Policy before placing your order. Please contact us with any questions.