5V Relay Module — available in 1, 2, 4, or 8 channel versions, each module includes optocoupler isolation for improved reliability and noise immunity. Key benefits Protects your controller: Optocoupler isolation reduces electrical interference and helps prevent harmful feedback to your 5V logic controller. Flexible channel options: Choose 1, 2, 4, or 8 relay outputs to match the scale of your project without buying extra modules. Simplifies automation: Control multiple devices or circuits from a single board to reduce wiring and centralize switching logic. Space-efficient: Compact design fits into constrained enclosures and makes it easy to add relay control to existing projects. Reliable relay switching: Mechanical relay outputs provide clear on/off control for external circuits and devices. What it does and how it fits Function: Provides isolated relay outputs that switch external loads using 5V control signals. Compatibility: Designed for use with 5V logic-level controllers and control systems. Performance: Optocoupler isolation improves noise immunity and overall stability when switching multiple channels. Design: Compact form factor allows easy integration into automation panels, prototyping setups, and embedded projects. Typical applications Home automation: Centralize control of lighting, fans, and other household circuits from a single controller. Small-scale industrial or lab automation: Drive pumps, solenoids, and motors while keeping control electronics isolated from switching noise. Multi-zone systems: Manage irrigation valves, HVAC zones, or rack-mounted equipment where several relays are needed in one module. Ordering tip Select the 1, 2, 4, or 8 channel version to match the number of devices you need to control and simplify wiring and system layout.