System Sensor 5251B


Fixed temperature thermal detector

Available with Lead Time

  • Factory New
Brand: System Sensor Part #: 017131 Categories: , Manufacturer Part #: 5251B Tag:


200 Series smoke detectors are intelligent (addressable) detectors with point ID capability that enable each detector address to be set with decade address switches to provide exact detector locations. The sensitivity of 200 Series detectors can be programmed using the control panel software to suit the environment. In addition, detector sensitivity is continually monitored and reported to the panel.

Both the 5251B and 5251RB detectors use an innovative thermistor sensing circuit to produce 135°F fixed and rate-of-rise thermal detection in low-profile packages. The 5251H model provides fixed high-temperature detection at 190°F. These thermal detectors provide cost-effective, intelligent property protection in a variety of applications.


Weight 1.00 lbs
Dimensions 5 × 5 × 5 in

Rotary Dials


Thermal Rating



Detection Method

Fixed Temperature


  • Sleek, low-profile design
  • Analog communications
  • Low standby current
  • Rotary address switches
  • Superior EMI protection
  • Dual LEDs for 360° visibility


200 Series: Intelligent Low-Profile Plug-In Detectors
Installation and Maintenance Instructions: 5251B, 5251RB, 5251H Intelligent Plug-in Temperature Sensors


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