Marquardt insulation seal and mounting frames for rocker switches series 3250 marquardt 217877011 a stacking mounting frame adaptor for rocker switches of the 3250 series from marquardt this adaptor will mate with others on one side only either another identical frame or a 217878011 59 3917 which is a middle adaptor and can mate on both sides allows switches which normally require a 211 x 368mm cut out to fit into a 22 x 384mm cut out marquardt 217877011 end panel adaptor for