Siemens FDO421 Photoelectric Smoke Detector

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). COMPATIBLE FACPs: — FireFinder XLS — FC2025 Desigo 252-point system — FC2050 Desigo 504-point system — FV2025 252-point intelligent voice communication system — FV2050 504-point intelligent voice communication system COMPATIBLE BASES and ACCESSORIES: — DB-1 Detector Mounting Base — DB-11E Detector Base {small} — DB-2HR Relay Base — DB-11C Detector Mounting Base for use in CANADA — RL-HC Remote Alarm Indicator: 4” octagon-box mount, red — RL-HW Remote Alarm Indicator: Single-gang box mount, red — FDBZ492 Addressable AirDuct Housing — FDBZ492-HR Addressable AirDuct Detector with Relay — LK-11 Base Locking Kit — DPU Device Programmer / Loop Tester