| 摘要 |
A circuit arrangement for protecting a load connected across a supply against surge voltage includes a gas-filled arrester connected in parallel with a semiconductor arrester across the load. A firing circuit is provided which is responsive to the breakdown of the semiconductor arrester to apply a voltage between a trigger electrode in the gas-filled arrester and another electrode within the gas-filled arrester to reduce the breakdown voltage of the discharge gap of the gas-filled arrester. The arrangement is operative for protection against surge voltages between the supply lines, and also between each line and earth.
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