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This listing includes 1 piece of 4-pin power relay, interchangeable with TRA4 D-12VDC-S-H, TRA4 L-12VDC-S-H and equivalent to 36FA-12V-10A. It runs on 12V DC and supports 10A switching current, providing stable circuit control for automotive systems, household appliances, timers, and small electrical devices. Each relay is fully tested to ensure safe and consistent performance, ideal for equipment maintenance and repair.