| CPC H02H 9/042 (2013.01) [H02H 5/047 (2013.01); H01C 7/12 (2013.01)] | 12 Claims |

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1. An interference filter arrangement with surge protection having an input for a conductive phase and a neutral phase of a three-wire alternating-current voltage system, an output for a protected conductive phase and a protected neutral phase of a three-wire alternating-current voltage system, at least one terminal for a protective earth, at least one first coil arranged as a filter element between the input of the conductive phase and the output of the protected conductive phase, at least one second coil arranged as a filter element between the input of the neutral phase and the output of the protected neutral phase, at least one first three-pole gas-filled surge arrester arranged with its two external poles parallel to the first coil, at least one second three-pole gas-filled surge arrester arranged with its two external poles parallel to the second coil, at least three varistors, wherein a first varistor is connected to the pole of the first three-pole gas-filled surge arrester that is not connected to the first coil, a second varistor is connected to the pole of the second three-pole gas-filled surge arrester that is not connected to the second coil, and a third varistor is directly or indirectly connected to the protective earth, wherein a first capacitor and/or a first resistor is/are arranged in parallel to one of the poles of the first three-pole gas-filled surge arrester that are connected to the first coil and the pole of the first three-pole gas-filled surge arrester leading to the first varistor, wherein a second capacitor and/or a second resistor is/are arranged in parallel to one of the poles of the second three-pole gas-filled surge arrester that are connected to the second coil and the pole of the second three-pole gas-filled surge arrester leading to the second varistor.
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