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5621 - Honeywell System Sensor Hardwired Heat Detector (135°F Fixed Temp/Rate-of-Rise)

5621 - Honeywell System Sensor Hardwired Heat Detector (135°F Fixed Temp/Rate-of-Rise)
5621 - Honeywell System Sensor Hardwired Heat Detector (135°F Fixed Temp/Rate-of-Rise)
Item# 5621

Please Note: The Honeywell System Sensor 5621 hardwired heat detector with fixed temperature and rate-of-rise has been discontinued without replacement.

System Sensor 5621 Product Description:


The System Sensor 5621 is a 5600-series, 135°F fixed temperature, rate-of-rise, dual-circuit, mechanical heat detector with plain housing. The 5621 detector offers a low-cost means for property protection against fire, and for non-life-safety installations where smoke detectors are inappropriate. Add the hardwired 5621 heat detector to most existing alarm system control panels.

To satisfy a variety of installation needs, the 5621 easily mounts to single-gang and octagonal back boxes. And the 5621 accommodates four-square back boxes, when used with a square to round plaster ring. The reversible mounting bracket permits both flush and surface-mount back box installations.

The 5621 provides clear markings on the exterior of the unit to ensure that the proper detector is being used. Alphanumeric characters identify the activation method, as well as the temperature rating, in Fahrenheit and Celsius degrees. The 5621 is a combination fixed/rate-of-rise unit and is clearly marked FX/ROR. The 5621 detector also provides a post-activation indicator in the form of a collector. When the detector is activated, the collector drops from the unit, making it easy to identify the unit in alarm.

Product Features:

  • Multiple configurations for installations: Dual-circuit model, combination fixed-temp/rate-of-rise 135°F rating
  • Easy-to-use terminal screws
  • A broad range of back box mounting options: Single gang, 3.5" and 4" Octagonal, 4" square with square to round plaster ring
  • Reversible mounting bracket

System Sensor 5621 Product Specifications:


  • Dimensions (w/Mounting Bracket): 1.69" (4.3cm) Height x 4.57" (11.6cm) Diameter
  • Heat Sensor: 135°F (57°C) fixed temperature, 15°F (8.3°C) per minute rate-of-rise
  • Operating Temperature Range: 32° to 100°F (0° to 38°C)
  • Maximum Installation Temperature: 100°F (38°C)
  • Alarm Temperature: 135°F (57°C)
  • Operating Humidity Range: 5% to 95% Relative Humidity noncondensing
  • Single Gang: Yes
  • Wiring: Dual-Circuit
  • Wiring Gauge: 14-22 AWG
  • Mounting: 3½-inch octagonal back box, 4-inch octagonal back box, Single gang back box, 4-inch square back box with a square to round plaster ring
  • Operating Voltage: 6-125VAC / 3A
  • Ratings: 6-28VDC / 1A, 125VDC / 0.3A, 250VDC / 0.1A
  • Input Terminals: 1422 AWG
  • Activation: Fixed Temperature/Rate-of-Rise
  • UL Protected Spacing (10 Foot Ceiling): 50 feet 50 feet (15.24m 15.2m)
  • Weight: 6 oz. (170 g)

System Sensor 5621 Product Compatibility:


• Hardwired Control Panels (works universally across brands)*

* Depends upon the power availability of the control panel "brains" of the security system.
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