Southern Systems Inc. OCR-300LD OpTrac Control Board

Southern Systems Inc. OCR-300LD OpTrac Control Board is an automation control module manufactured by SSI, identified by the OCR-300LD model designation and an alternate reference ORC300LD. The part is listed in reseller catalogs under the OCR-300ld MPN, with SSI shown as the brand. Several marketplace listings describe the board as used, and at least one listing notes that it has been repaired. The OCR-300LD/ORC300LD identifiers are used by buyers and technicians to confirm the part's identity across SSI's legacy automation catalog, making them a reliable reference when sourcing replacement units for older OpTrac setups. Because information on older SSI components is often distributed across secondary markets, this OCR-300LD OpTrac board is typically sourced through used-equipment channels, where buyers rely on the OCR-300ld MPN and the OCR-300LD/ORC300LD naming to authenticate the part before purchase.