| 摘要 |
An overvoltage protection means is described, with a first electrode (1), with a second electrode (2), with an air breakdown spark gap (3) which is present or which acts between the electrodes (1, 2), and with a housing which holds the electrodes (1, 2), when the air breakdown spark gap (3) is initiated an arc (4) forming between the first electrode (1) and the second electrode (2). As claimed in the invention, an overvoltage protection means is devised which is characterized by high line follow current extinguishing capacity, but which nevertheless can be implemented with a simple structure, by the fact that a third electrode (5) is assigned to the first electrode (1) and the second electrode (2) and between the first electrode (1) and the third electrode (5) a second air breakdown spark gap (6) is present or active, that the third electrode (5) is connected via at least one impedance, especially a varistor (7), directly or indirectly to the second electrode (2), and that after discharging the surge current via the first electrode (1), the first air breakdown spark gap (3) and the second electrode (2), the remaining arc (4) can be moved from the first air breakdown spark gap (3) to the second air breakdown spark gap (6), especially by pneumatic or magnetic blow-out.
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