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This 12V 4-pin car relay features normally open contact configuration with 30A heavy load capacity. Built-in fuse effectively avoids circuit damage caused by overload and short circuit, greatly improving driving safety. Equipped with a supporting socket backrest, the connection is stable and loose contact is avoided. Adopting high-temperature insulated shell and high-quality internal coil, it runs steadily in complex vehicle environments. Perfect for controlling automotive headlights, cooling fans, horns, fuel pumps and various auto electronic modification projects.