The Models THD-7052 and THD-7053 are thermistor based electronic Heat Detectors with a 135°F (57°C) Fixed Temperature set point. In addition, the Model THD-7052 has a Rate-Of-Rise of temperature detection feature rated at 15°F (8.3°C) per minute. Both detectors have advanced solid-state, low-voltage, surface-mount circuitry and are designed for 2-Wire and 4-Wire installation using the appropriate Detector base. The detectors are designed for Open Area Protection (UL521) and may be installed in systems intended for Releasing Device Service through use of a compatible Fire Alarm Control Panel
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