2024 3.3V / 5V 3-Channel Relay Module — optocoupler isolation, low input current (5mA) Key benefits Allows low-voltage control of higher-power circuits while protecting control electronics with optocoupler isolation. Low input current (≈5mA) reduces load on microcontroller or signal source, improving reliability in battery- or microcontroller-powered projects. Dual-voltage compatibility (3.3V and 5V) supports a wide range of logic levels for direct connection to modern controllers. Three independent channels provide flexible multi-point control in compact form for space-constrained installations. What it does and why you need it Translates 3.3V or 5V logic signals into isolated relay switching, so you can safely control lights, motors, pumps, or other higher-voltage devices without exposing your controller to electrical noise or spikes. Optocoupler isolation minimizes interference and enhances stability between the control side and the switched side, reducing the chance of signal corruption or damage to sensitive electronics. Low trigger current simplifies wiring and protects microcontroller GPIOs, enabling reliable operation with devices that have limited drive capability. Key attributes Function: Three independent relay channels for switching external loads using 3.3V or 5V control signals. Compatibility: Designed for direct connection to common logic-level signal sources (3.3V and 5V microcontrollers, single-board computers, and control circuits). Performance: Optocoupler isolation for improved noise immunity and system stability; low input current (~5mA) for minimal control-side loading. Integration: Multiple channels in one module reduce wiring complexity and save space compared with separate relays. Practical application examples Home automation: Use the module to switch lighting circuits or low-voltage appliances from a 3.3V or 5V controller while keeping the controller isolated from mains noise. Robotics and actuation: Control motors, solenoids, or relays for actuators with safe isolation between the robot’s control board and power electronics. IoT and prototyping: Interface Raspberry Pi, Arduino, or other development boards to external devices that require isolated switching to protect sensors and communication lines. Notes for use Verify control logic level (3.3V or 5V) and ensure correct wiring for desired voltage mode. The module provides optocoupler isolation for the control side; follow safe wiring practices when switching high-voltage or high-current loads. Specifications (as provided) Model/year: 2024 Control voltages: 3.3V and 5V compatible Channels: 3 Input/trigger current: approximately 5mA Isolation: optocoupler isolation for improved protection and reduced interference