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This listing includes 5 pieces of HRS1H-S-DC12V 6-pin relay modules with 3A rated current, designed for industrial electronic circuit DIY and automation control. It is fully compatible with 4100F series relays and supports 5V, 12V, and 24V DC operating voltages. Featuring reliable switching and long service life, it is widely used in small control circuits, DIY devices, home automation, and equipment maintenance.