
Notifier FST-851 Series intelligent plug-in thermal detectors with integral communication has features that surpass conventional detectors. Point ID capability allows each detector’s address to be set with decade address switches, providing exact detector locations. FST-851 Series thermal detectors use an innovative thermistor sensing circuit to produce 135°F/ 57°C fixed-temperature (FST-851) and rate-of-rise thermal detection (FST-851R) in a low-profile package. FST-851H provides fixed high-temperature detection at 190°F/88°C. These thermal detectors provide effective, intelligent property protection in a variety of applications.

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| Agency Listings and Approvals |
| • UL Listed: S747 |
| • ULC Listed: S6978MEA Listed: 383-02-E |
| • FM Approved |
| • CSFM: 7270-0028:196 |
| • BSMI: CI313066760025 |
| • CCCF: Certif. # 2004081801000018 |
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• U.S. Coast Guard: 161.002/23/3 (AFP-200); 161.002/27/3 (AFP1010/AM2020); 161.002/42/1 (NFS-640) |
| • Lloyd’s Register: 03/60011 |

| Model No. | Description |
| FST-851 | Intelligent thermal detector. Must be mounted to one of the bases listed below. |
| FST-851A | Same as FST-851 but with ULC Listing. |
| FST-851R | Intelligent thermal detector with rate-of-rise feature. |
| FST-851RA | Same as FST-851R but with ULC Listing. |
| FST-851H | Intelligent high-temperature thermal detector. |
| FST-851HA | Same as FST-851H but with ULC Listing. |


This information is not intended to be used for installation purposes. We try to keep our product information up-to-date and accurate. We cannot cover all specific applications or anticipate all requirements. All specifications are subject to change without notice.
- Pipe and Accessories
- Welding Equipment & Supplies
- Fire Protection
- Fire Detection
- Power Tools
- Automation & Control Systems
- Gas Detection
- Personal Safety
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- Weatherproof Solar Light
- Signalling Stack Light
- Explosionproof Multi Colour LED
- Combination Signalling Devices

