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280B-PL Series

Rate-of-Rise and Fixed Temperature Heat Detectors


  • Low profile with wide base

  • Positive fixed temperature operating indication

  • On site testing of rate-of-rise feature

The 280B-PL Series heat detectors offer fixed temperature or combination rate-of-rise and fixed temperature features. The heat detector is available with a white plastic reversible mounting plate. The plastic plate can be used for either flush or surface mounting. It includes a white skirt which covers the space between detector base and the mounting surface.

*NOTE: Maximum detector coverage has been determined by UL to provide detection time equal to sprinkler devices spaced at 10 ft (3.05m) intervals on a smooth ceiling 15 feet 9 inches (4.8m) high. Higher ceilings may adversely affect detection time. Earlier detection may be obtained by reducing the spacing between detectors. (See NFPA 72, Chapter 5)

Detector twists and locks onto mounting plate. Mounting plate may be surface mounted or mounted onto any 3 1/4" (83mm) or 4" (102mm) octagon box.

NOTE:  Effective July 1, 2015, the 281B-PL and 282B-PL detectors will no longer be manufactured.  You may be able to use the 283B-PL or 284B-PL instead if you only need fixed temperature.

280B-PL Series

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Catalog Numbers

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Catalog Number

Reversible Mounting Plate for 280 Heat Detectors


Heat Detector
6-125 VAC, 3 A; 6-28 VDC, 1A; 125 VDC, 0.3 A; 250 VDC, 0.01 A


Heat Detector
6-125 VAC, 3 A; 6-28 VDC, 1A; 125 VDC, 0.3 A; 250 VDC, 0.01 A




Agency Approvals
UL Listed FM Approved CSFM Listed
  • Single circuit normally open contact rated at 3 amps at 6 to 125V AC; 1.0 amps at 6 to 28V DC, 0.3 amps at 125V DC, and .01 amps at 250V DC
  • Maximum coverage 2,500 sq. ft. (232.25 sq. m)
  • UL spacing: 50 ft (15.24m)
  • FM spacing: 30 ft (9.14m)
  • Color - white

Cat. No.DescriptionRate-of-Rise
UL Temp.
Rating F
UL Max. Ambient
Ceiling Temp. Rating F
281B-PLROR & Fixed15F/min.135100
282B-PLROR & Fixed15F/min.194150

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