Siemens FDOT421


Addressable Multi-Criteria Fire Detector

Availability: Estimated 6 - 8 Business Days

  • Factory New
Brand: Siemens Part #: 63313 Categories: , , Manufacturer Part #: FDOT421Secondary Part #: S54320-F6-A1 Tags: , , ,


The Photoelectric | Thermal (Heat) Detector (Model FDOT421) is an intelligent, addressable multi-criteria detector that incorporates optical and thermal sensors, and uses signals in a neural network to create an intelligent multi-criteria detector. The encompassing result is a detector that provides enhanced detection to a wide range of products of combustion.

Model FDOT21 is UL 268 7th Ed. listed and incorporates advanced built-in ISOtechnologyTM – True Class-X SLC operation (use is optional) greatly improves reliability, circuit integrity and provides advanced addressable fault finding.

The multi-criteria detector additionally has state-of-the-art microprocessor circuitry (with error check), as well as detector self-diagnostics and supervision programs that is used on Desigo Fire Safety Modular | FireFinder XLS/V and on Model FC/FV20-series Desigo Fire Safety fire-alarm control panels (FACPs).

Additionally, Model FDOT421 is a plug-in and addressable two-wire multi-criteria detector (with both photoelectric and thermal sensors) whose value is increased with built-in ISOtechnology feature, that is compatible with all current Siemens intelligent, addressable systems.


Weight 1.00 lbs




Detectable Medium


Detection Method

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Multi-Criteria Fire Detector; Model FDOT421
Siemens – Data Sheet
Multi-Criteria Smoke Detector; Model FDOT421
Siemens – Installation Instructions


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