| 摘要 |
An overvoltage protection device for use in power supply, especially low voltage systems, is described, with a housing ( 2 ), a first electrode ( 3 ), at least one second electrode ( 4 ), an arc chamber ( 5 ) within the housing ( 2 ) between the two electrodes ( 3, 4 ), and with a breakdown spark gap between the two electrodes ( 3, 4 ), an arc forming between the electrodes ( 3, 4 ) when the breakdown spark gap is ignited. In order to more reliably prevent the occurrence of a grid follow current and re-ignition of the breakdown spark gap in the overvoltage protection device, at least one outflow and cooling channel ( 6 ) is formed in the housing ( 2 ) through which the hot plasma from the arc chamber ( 5 ) can emerge, the outflow and cooling channel ( 6 ) extending in the lengthwise direction of the housing ( 2 ) and being helical.
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