Pertronic THD-series Thermistor Heat Detectors are conventional indicating heat detectors with fixed temperature thresholds, for use in NZS 4512-compliant fire systems.

The freezer model (THDB-57C-WP-FZR) has a 57 °C (Blue) alarm threshold and wire tail terminations for moisture resistance.

Features

• Conventional indicating heat detector with fixed temperature threshold
• Suitable for cold environments with operating temperatures down to -40 °C
• Smooth uncluttered design
• Encapsulated electronics
• Corrosion-resistant materials
• Red LED indication latches ON when an alarm condition is detected
• Bi-directional Zone In + Zone Out terminations
• Yellow LED indicates reverse polarity connection
• Reverse polarity connection initiates the Defect: High status in Pertronic panels
• In the alarm state, the detector clamps the detection circuit voltage to 2.7 V
• Resistant to false activation caused by vibration or other transient impulses
• Independently tested and certified compliant with NZS 4512:2010