Feuerkontakt

Feuerkontakt is a term used in German-speaking regions to describe a type of fire detection device commonly known in English as a fire contact switch or fire temperature contact. The device consists of a pair of electrical contacts enclosed in a temperature-sensitive material. When the surrounding temperature rises to a pre-set level, the material expands or melts, causing the contacts to open or close. This action completes a circuit that activates fire suppression systems, alarms, or emergency shutdowns.

The original concept emerged in the mid‑20th century as part of early sprinkler and fire alarm systems. It provided a simple mechanical means of translating heat into an electrical signal without relying on electronic sensors. Feuerkontakte were typically made from metals such as aluminum, brass or stainless steel, and the temperature activation points ranged from 60 °C to 120 °C, depending on the required sensitivity.

In modern installations, Feuerkontakt switches are often integrated with building automation systems. When connected to a programmable logic controller (PLC) or a fire alarm panel, the switch can trigger a cascade of safety responses: shutting down equipment, closing isolation valves, or sounding audible and visual alarms. Industry standards such as DIN EN 54 and NFPA 72 specify performance and installation criteria for these devices, ensuring reliable operation in commercial and industrial settings.

Although solid-state sensors have largely supplanted mechanical contact switches in new construction, Feuerkontakte remain valued for their simplicity, low cost, and proven durability. They are still widely used in legacy systems and in applications where accessibility and maintenance are critical, such as in active fire suppression, HVAC zone control, and safety instrumentation in heavy industry.