<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-03-08</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000916230</issuerCik>
        <issuerName>PROTECTION ONE INC</issuerName>
        <issuerTradingSymbol>PONN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001392470</rptOwnerCik>
            <rptOwnerName>Lessner Kimberly G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PROTECTION ONE, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1035 N. 3RD ST., SUITE 101</rptOwnerStreet2>
            <rptOwnerCity>LAWRENCE</rptOwnerCity>
            <rptOwnerState>KS</rptOwnerState>
            <rptOwnerZipCode>66044</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>Exhibit 24.1 Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ J. Eric Griffin, under power of attorney</signatureName>
        <signatureDate>2007-03-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
