Abb Schweiz Ag

Appalette Tourtellier Systèmes

Luc Rieffel

Lukas Zehnder

Olaf Hunger

Gérard Faesch

The power breaker is provided with at least one arcing chamber ( ) which is filled with SF gas, is rotationally symmetrical, and extends along a longitudinal axis ( ). The arcing chamber ( ) has a power current path with a central contact pin ( ), and has a separate rated current path provided with rated current contacts ( ). The arcing chamber ( ) is operated by a drive linkage ( ) which moves the contact pin ( ) and the rated current contacts ( ). The drive linkage ( ) is designed such that, at the start of the disconnection process, the contact pin ( ) remains in a first dead point position until the rated current path is interrupted. The contact pin ( ) can then be moved in the disconnection direction at a considerably higher speed than the rated current contacts ( ). Toward the end of their disconnection travel, the rated current contacts ( ) run into a second dead point position. The contact pin ( ) does not reach its disconnected position until after the rated current contacts ( ) have ended their disconnection movement. At the start of the connection process, the rated current contacts ( ) remain in this second dead point position until the pre-arcing of the switch-on arc has taken place. The rated current contacts ( ) are in this way advantageously protected against damage caused by an arc.

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Muespach, France

Luc Rieffel