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This 5-piece set includes Songle SRD series power relays (SRD-09VDC-SL-C), covering 3V, 5V, 6V, 9V, 12V, 24V and 48V DC coil voltages. With 10A 250VAC load capability and 5-pin SPDT structure, they are widely used in smart home devices, Arduino/Raspberry Pi projects, automotive controls, home appliances, security systems and industrial automation. The relays feature compact size, high sensitivity and stable performance, supporting direct PCB mounting and easy replacement of common T73 relays. Perfect for makers, DIY enthusiasts and electronic maintenance, providing reliable low-voltage control of high-power loads for various brand devices.