lufttilbakkekontakt

Lufttilbakkekontakt, which translates to "air return contact" or "air circuit breaker contact" in English, refers to the moving and stationary parts within an air circuit breaker that facilitate the interruption of electrical current. These contacts are crucial components responsible for opening and closing the electrical circuit. When the circuit breaker is activated, typically by a fault condition or manual operation, these contacts physically separate, creating an air gap that extinguishes the electrical arc.

The design of lufttilbakkekontakt is engineered to withstand the immense heat and pressure generated during arc quenching. They are often made from specialized alloys, such as copper alloys with silver or tungsten, to ensure durability and efficient conductivity while minimizing erosion. The shape and surface finish of the contacts are also critical for effective arc suppression and long operational life.

During operation, the movement of the lufttilbakkekontakt is rapid to minimize the time the arc is present. The separation distance and speed are precisely controlled to ensure reliable interruption of fault currents. After the arc is extinguished, the contacts remain separated until the circuit breaker is reset. The proper functioning and maintenance of these contacts are essential for the safe and reliable operation of air circuit breakers, which are commonly used in medium and low-voltage power distribution systems. Wear and tear on the contacts can degrade performance and necessitate their replacement.