Catalog > New Siemens FDT421 S54320-F5-A1 Desigo F...

Verified: January 13, 2026

New Siemens FDT421 S54320-F5-A1 Desigo Fire Alarm Thermal Heat Detector Head

~$34.99

The Siemens FDT421 S54320-F5-A1 is a thermal heat detector head designed for use in fire alarm systems to detect heat and trigger alarms in case of fire.

Key Specifications

  • Compatibility: Siemens Desigo fire alarm systems
  • Operating Temperature: 0°C to 50°C
  • Response Time: Less than 30 seconds
  • Mounting: Standard base with screw terminals
  • Alarm Temperature: Fixed at 57°C
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