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SC20FTU-3 & SC20RRU-3

System Heat Detectors Conventional Initiating Devices


  • 135F (58C) fixed temperature model

  • 135F (58C) rate of rise model

  • LED alarm indication

  • Sensitivity test feature with use of EC-PST test tool

  • Tamper resistant with site selectable lock

  • White molded high impact fire retardant plastic

  • Surface mount technology

  • All components conformally coated to seal against dust and moisture

Based on advanced thermistor technology, the Edwards SC20 Series heat detectors provide a reliable response to fires in areas where environmental conditions prohibit the use of smoke detection.

The SC20FTU-3 is a fixed temperature unit, with an alarm threshold, operating at 135°F (58°C). It is intended for applications where fluctuations of ambient temperature may be expected such as over machinery in laundries, or factory locations where industrial processes may cause sharp temperature increases.

The SC20RRU-3 has an alarm threshold of 135°F (58°C) and operates on the rate of rise of 15° or greater per minute. To increase response time, without compromising reliability, a rate compensation element enables the detector to become more sensitive to higher rates of temperature rise. Applications include general use in areas where smoke detection would be likely to produce false alarms such as in kitchens or shower rooms.

A high intensity, red LED indicator situated on the detector molding provides clear indication when the unit is in alarm. For ease of removal, these detectors plug into the CSBU-1 base unit by a simple twist and lock action. In order to prevent unauthorized removal, a site selectable option is provided to lock the detector into its base. Once applied, the unit can only be removed by means of a special tool (Cat. No. EC-PST). See specifications for mounting box options and terminal sizes. All detectors are monitored for detector removal.

Note:  SC20 heat detectors will no longer be available after December 31, 2015.

SC20FTU-3 & SC20RRU-3

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Catalog Numbers

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Catalog Number

135F Fixed Temperature Heat Detector
10.2V - 30V DC


135F Fixed Temperature/15F Rate of Rise Heat Detector
10.2V - 30V DC



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