Abb Research Ltd.

Guido Hoffmann

Uwe Kaltenborn

Mariusz Wilniewczyc

Patrik Huser

The impact signaling system ( ) is used in a high-voltage protective device and has a housing ( ), a spring ( ) which is arranged in the housing ( ) and has a moveable end, an actuator ( ) which can be passed out of the housing ( ) and interacts with the moveable end of the spring ( ), a high-resistance resistor wire ( ) which is connected in parallel with a fusible wire of the protective device, and a holder which absorbs the prestress of the spring ( ). The holder contains a section of the high-resistance resistor wire ( ) which is in the form of a winding ( ) and is passed at least once around the moveable end of the spring ( ) in order to form the prestress, and which is at least partially in thermally conductive contact with the material of the activator ( ). Above a limit temperature, the activator ( ) lifts, for example by destruction of the winding ( ) or by melting through, the holder and activates the impact signaling system ( ) by reducing the load on the spring ( ).

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Wettingen, Switzerland

Guido Hoffmann