Multiple configurations available to satisfy a broad range of installations:

  • Single- and dual-circuit models
  • Fixed temp and combination fixed- temp/rate-of-rise
  • 135°F or 194°F ratings

Simple to read alphanumeric text on the exterior of the detector indicates
activation method and temperature rating

Easy to use terminal screws that provide a more positive wiring connection

A broader range of back box mounting options:

  • Single gang
  • 3.5″ and 4″ Octagonal
  • 4″ square with square to round plaster ring

Reversible mounting bracket for flush and surface mount installations

System Sensor’s 5600 series mechanical heat detectors offer a low-cost means for property protection against fire, and for non-life-safety installations where smoke detectors are inappropriate.

Multiple Configurations.  The 5600 series offers a full-line of configurations to accommodate a broad range of applications.  Both single- and dual-circuit models are offered, each available for low- and high-temperature ratings with either fixed temperature or combination fixed temperature/rate-of-rise (ROR) activation.  The ROR element of the fixed/ROR models is restorable, to accommodate field-testing the unit.

Installation Flexibility.  To satisfy a variety of installations, the 5600 series
easily mounts to single-gang and octagonal back boxes.  These models also
accommodate four-square back boxes, when used with a square to round
plaster ring.  The mounting bracket is reversible to allow for flush- and
surface-mount back box installations.

Visual Identification.  The 5600 series 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 degrees Fahrenheit and Celsius.  Fixed temperature models are identified “FX,” while continuation fixed/rate-of-rise units are marked “FX/ROR.”  The 5600 series also provides a post-activation indicator in the form of a collector.  Once the detector has been activated, the collector drops from the unit, to easily identify the specific unit in alarm.


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Models Available

Single-Circuit Models
5601135⁰F Fixed Temperature / Rate-of-Rise
5602194⁰F Fixed Temperature / Rate-of-Rise
5603135⁰F Fixed Temperature
5604194⁰F Fixed Temperature


Dual-Circuit Models
5621135⁰F Fixed Temperature / Rate-of-Rise
5622194⁰F Fixed Temperature / Rate-of-Rise
5623135⁰F Fixed Temperature
5624194⁰F Fixed Temperature

Mechanical heat detector shall be a System Sensor 5600 series model number _____, listed to Underwriters Laboratories UIL 521 for Heat Detectors ior Fire Protect ive Signaling Systems.  The detector shall be either a single-circuit or a dual-circuit type, normally open.  The detector shall be rated for activation at either 135°F (57°C) or 194°F (90°C) , and shall activate by means of a fixed temperature thermal sensor, or a combination fixed temperature/rate-of-rise thermal sensor. The rate-of-rise element shall be activated by a rapid rise in temperature, approximately 15°F  (8.3°C) per minute.  The detector shall include a reversible mounting bracket for mounting to 3 1/2-inch and 4-inch octagonal, single gang, and 4-inch square back boxes with a square to round plaster ring.  Wiring connections shall be made by means of SEMS screws that shall accommodate 14-22AWG wire.  The detector shall contain alphanumeric markings on the exterior of the housing to identify its temperature rating and activation method.  The rate-of-rise element of combination fixed temperature/rate-of-rise models shall be restorable, to allow for field-testing.  The detectors shall include an external collector that shall drop upon activation to identify the unit in alarm.


Operating Voltage / Contract Ratings

6 – 125 VAC / 3A
6 – 28 VDC / 1A
125 VDC / 0.3A
250 VDC / 0.1A


Physical Specifications

Maximum Installation Temperature:
5601, 5603, 5621, and 5623: 100°F (38°C)
5602, 5604, 5622, and 5623: 150°F (65.6°C)
Alarm Temperature:
5601, 5603, 5621, and 5623: 135°F (57°C)
5602, 5604, 5622, and 5623: 194°F (90°C)
Rate-of-Rise Threshold:
15°F (8.3°C) rise per minute
(models 5601, 5602, 5621, and 5622 only.)
Operating Humidity Range:
5 to 95% RH non-condensing
Input Terminals:
14 – 22 AWG
3 1/2-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
Dimensions with mounting bracket:
Diameter: 4.57 inches (11.6cm)
Height: 1.69 inches (4.3cm)
6 oz. (170 grams)


Ordering Information
ModelCircuitTemperature RatingActivationUL Protected Spacing – 10 Foot Ceiling*
5601Single135°F (57°C)Fixed Temperature / Rate-of-Rise50 feet x 50 feet (15.24m x 15.2m)
5602Single194°F (90°C)Fixed Temperature / Rate-of-Rise50 feet x 50 feet (15.24m x 15.2m)
5603Single135°F (57°C)Fixed Temperature25 feet x 25 feet (7.62m x 7.62m)
5604Single194°F (90°C)Fixed Temperature25 feet x 25 feet (7.62m x 7.62m)
5621Dual135°F (57°C)Fixed Temperature / Rate-of-Rise50 feet x 50 feet (15.24m x 15.2m)
5602Dual194°F (90°C)Fixed Temperature / Rate-of-Rise50 feet x 50 feet (15.24m x 15.2m)
5603Dual135°F (57°C)Fixed Temperature25 feet x 25 feet (7.62m x 7.62m)
5604Dual194°F (90°C)Fixed Temperature25 feet x 25 feet (7.62m x 7.62m)

*Note:  Refer to NFPA72 guidelines for spacing reductions when ceiling heights exceed 10 feet.