Product Details
The Siemens FDO421 Photoelectric Smoke Detector is a plug-in, two-wire, addressable photoelectric smoke detector. The FDO421 supports two operation modes: polarity insensitive mode and isolator mode.
The FDO421 may be used with Siemens Model ‘H’ series devices on the same loop (with Desigo fire-alarm control panels FACPs or FireFinder XLS FACPs).