The FST-851A is a Fixed Temperature Thermal Detector for use with ONYX Series panels.

The FST-851RA is a Rate-of-Rise Thermal Detector for use with ONYX Series panels.

The FST-851HA is a High Temperature Thermal Detector for use with ONYX Series panels. 851A Series Thermal Heat Detectors

851A Series Thermal Heat Detectors

Intelligent (addressable) detectors with point ID capability that enable each detector address to be set with rotary address switches to provide exact detector locations. Our thermal detectors use an innovative thermistor sensing circuit to produce 135°F fixed, rate-of-rise and 190°F high-temperature detection for cost-effective, intelligent property protection.

Features & Benefits:

Thermal smoke detection

Analog communications

Low standby current

Rotary address switches

Dual LEDs for 360° visibility
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Features