Thanks. This thread has helped a lot. Anyone still around? I have a bad relay and my difficulty comes in matching the part. I've gone to the findernet.com relay website and studied the numbering system. The fifth character in the part number indicates DC or sensitive DC. I've found no identifying marking on the part. The part number is 44.52.?.024.0000. The question mark can be a 7 or a 9. Anyone know the correct number?