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This package includes 5 pieces of YC-012(1)-1H high-power relay with corresponding relay base. Rated at DC12V and capable of switching up to 40A current, it provides reliable control for high-power equipment. The 4-pin structure and matching base ensure stable wiring and convenient replacement. With excellent anti-interference and durability, it is widely used in automotive circuits, power distribution, inverters, welding machines, and other heavy-load control systems. Perfect for maintenance, modification, and industrial equipment assembly.