As part of our continuous quality monitoring process, we have discovered a vendor non-conformance with an insulator that may affect some of the H-Frame and P-Frame Transfer Switches manufactured between March 23, 2018 and November 2, 2018. These units have serial numbers where the first 7 digits fall within the range of 1384194 through 1809744. Please use the download links below to check the compliance of your transfer switch and let us know if affected. If you have futher questions, please call 1-800-800-ASCO (2726) and select option 5.