Siemens OP121 OP-Series photoelectric smoke detector for addressable fire alarm systems.

Compliance

• UL 268
• UL 268A
• NFPA 72
• CSFM
• ULC Listed

Key features

• Photoelectric detection technology optimized for slow-smoldering fires in commercial occupancies
• Operating voltage 16–27 VDC; alarm current 50 mA for compatibility with Siemens SLC panels
• Velocity range 0–4,000 fpm supports ceiling, wall, and plenum mounting configurations
• Operating range 32–120°F (0–49°C) at 0–95% relative humidity
• Mounts on standard Siemens DB-series detector bases within Cerberus PRO system architecture

The OP121 is part of the Siemens OP-Series and integrates with Cerberus PRO and FireFinder XLS addressable fire alarm control panels. It uses a photoelectric chamber to detect the light-scattering signature of smoke particles, making it well-suited for detecting smoldering combustion in offices, hotels, and healthcare facilities. The detector occupies one address on the signal line circuit and reports alarm and fault conditions to the host panel.

Verify panel/device family compatibility before ordering.