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This package includes 1 piece of YC 012(1)-1Z DC12V 40A relay (equivalent to V4-1C-12V-40A) with a dedicated relay base. It features a 5-pin structure and high-current switching capability, suitable for automotive circuits, water pumps, fans, air conditioners, and other high-power control systems. The relay base provides secure connection and convenient wiring for maintenance and replacement.