5 V Relay Control Module — isolated, reliable switching for 5 V control systems Key benefits Provides safe electrical isolation between your 5 V control circuit and high-voltage/current loads using an SMD optocoupler, reducing interference and protecting the controller. Low drive requirement: trigger current 5 mA minimizes load on microcontroller outputs. Robust switching: built with a quality electromechanical relay and rated for AC 250 V / 10 A or DC 30 V / 10 A for real-world loads. Fail-safe behavior: fault-tolerant design ensures the relay will not activate if the control line is defective, reducing accidental switching. Main features Operating voltage: 5 V control supply. Isolation: SMD optocoupler between control input and relay drive for stable performance and noise immunity. Trigger: selectable active-high or active-low operation via jumper, accommodating different control logic without rewiring. Contact type: normally open (NO) relay interfaces. Load capacity: maximum AC 250 V / 10 A, DC 30 V / 10 A. Drive requirement: trigger current 5 mA. Performance and compatibility Designed to work with 5 V logic controllers and control circuits that can supply the module’s 5 V operating voltage and 5 mA trigger current. Compact PCB construction with SMD components for reliable, repeatable switching performance in embedded and prototyping applications. Typical applications Home automation: switch lighting or appliances up to AC 250 V / 10 A from a 5 V controller while keeping the control electronics isolated from mains. Industrial/DIY control: control DC actuators, pumps, or motors within the DC 30 V / 10 A limit using isolated logic-level inputs. Prototyping and test systems: add isolated, jumper-selectable relay control to 5 V development boards where low trigger current and fault tolerance are important. Installation notes Provide a stable 5 V supply to the module and respect the 5 mA trigger current requirement. Configure the jumper for active-high or active-low triggering to match your controller logic before connecting the control line. Observe the relay’s AC/DC maximum ratings when wiring loads to avoid overloading the contacts.