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This package includes 1 piece of SLD12VDCB power relay (marked V41B4P12V30A) and 1 matching relay base. It uses a 4pin interface with 12V DC operating voltage and supports up to 30A load, ideal for highpower circuit switching in industrial control, automotive circuits, household appliances and automation DIY projects. The matched base makes wiring safer and more stable, easy to install and replace.