Siemens HI121 addressable heat detector head for fire alarm system installations.

Compliance

• UL 521
• ULC S530
• CSFM

Key features

• Addressable heat detector head with alarm current of 50 mA for Siemens SLC integration
• Operating temperature range 32–100°F (0–38°C) for standard commercial and institutional occupancies
• Velocity range 0–4,000 fpm and humidity 0–95% for typical building environments
• UL 521 listed for heat detection and ULC S530 listed for Canadian market applications
• Mounts on standard Siemens detector bases compatible with Cerberus PRO and FireFinder XLS systems

The HI121 is a Siemens addressable heat detector head used in commercial fire alarm installations on Cerberus PRO and FireFinder XLS platforms. It provides thermal detection where smoke detectors are not suitable, such as in high-particulate or high-humidity environments. With UL 521 and ULC S530 listings, the HI121 meets detection standards for both US and Canadian fire safety codes. It mounts on DB-series bases and communicates alarm and supervisory status via the signal line circuit.

Verify panel/device family compatibility before ordering.