Boston Fincor 105335101-L Relay Interface IL Board

Boston / Fincor 105335101-L Relay / Interface Board Rev L is a legacy relay-interface module used in Boston/Fincor automation systems to connect the main controller with external relays and signaling circuits. The part is identified as 105335101-L, with Rev L denoting the revision; related revisions in the same family include 105335101-E and 105335101-H. Suppliers describe this board as a Relay / Interface Board; in the refurbished market, the 105335101-L is offered by several vendors as a serviced spare for existing equipment. When evaluating fitment, match the part number and revision to your controller model and verify that the board’s connector layout matches your system’s backplane or interconnect cables. This part is listed by sources such as York Controls as refurbished, and you may encounter other catalog entries for the same family, reinforcing the importance of verifying exact revision before purchase. Additional sources show other FINCOR relay interface boards in the same lineage, for example 1045963-01-C, and eBay and catalog listings reference related revisions like 105335101-E, indicating an active ecosystem of legacy spare parts. Use precise search terms such as “Boston,” “Fincor,” “105335101-L,” “Relay / Interface Board,” and “Rev L” when seeking a replacement to ensure compatibility with your legacy Boston/Fincor installation.