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This is 1 piece of S3-12A 12V 4-pin power relay, compatible with S3-12-A, S3-24-A, S3-24B-A, S3H-24-1A, SHORI and T73-1A series. It features stable contact switching, strong anti-interference ability, and reliable long-term operation. Widely used in household appliances, timers, security systems, automotive circuits and small electrical maintenance.