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Abstract

The object of the invention is an ignition circuit for a series connection of at least two spark gaps for limiting overvoltages with medium and high power, particularly overvoltages corresponding to pulse shapes 8/20 μs and 10/350 μs with amplitudes of about 10 kA to about 200 kA (class I arrester). The spark gaps are each equipped with at least one auxiliary electrode. The ignition circuit has a first varistor and a second varistor, with the ignition circuit being particularly suited to limiting overvoltages with medium power, particularly overvoltages corresponding to pulse shape 8/20 μs with amplitudes of about 10 to about 100 kA (class II arrester). The ignition circuit is designed to be connected to the auxiliary electrodes, with the ignition circuit Z having two ignition subcircuits. The first ignition subcircuit TZ₁ has the first varistor VAR₁ and is designed to ignite the first spark gap. The second ignition subcircuit has the second varistor and is designed to ignite the second spark gap. Further objects of the invention are an overvoltage protection device with this kind of ignition circuit, as well as the use of a multi-contact varistor for triggering a spark gap.

First Claim