Kidde Thermal products have proven to be the most reliable in the industry.

Linear Thermal Detector


The Linear Thermal Detector (LTD) is a twin conductor cable with a heat-sensitive covering protected by an outer sheath. In a fire or overhead condition, the heat sensitive covering melts, causing the conductors to short, which alarms the system.


Alarm temperature 
350° F
177° C

Operating temperature
221° F
105° C

Note: If the wire alarms to a fire, the wire must be replaced or the damaged section cut out and a new section added prior to returning the system to service.

Linear Thermal