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This set includes 5 pieces of general-purpose power relays from the JQC-3FF (HF-JQC-3FF) series, available in 5V, 9V, 12V, and 24V DC versions with 1HS (normally open) or 1ZS (changeover) contacts. This model is JQC-3FF-005-1HS with a 5V DC coil and 4-pin layout. Featuring reliable switching and strong compatibility, it is widely applied in DIY circuits, time relays, small appliances, and electronic control systems. Each unit is tested for stable performance.