5V Relay Module Optocoupler High/Low Trigger

Switch high-power AC or DC loads safely from a low-voltage microcontroller signal with this 5V Relay Module, built around genuine relays and optocoupler isolation for reliable, protected switching. Each channel accepts a simple 5mA trigger signal from an Arduino, ESP32, Raspberry Pi, or similar board, and can be configured for either high-level or low-level triggering via an onboard jumper, giving you flexibility to match whatever logic your control code expects.

The optocoupler isolation electrically separates your control circuit from the switched load, protecting sensitive microcontroller pins from voltage spikes and back-EMF when driving inductive loads like motors, solenoids, or pumps. Each relay channel includes a normally open (NO), normally closed (NC), and common (COM) terminal, giving you the flexibility to wire either fail-safe configuration depending on your application. Power and per-channel status LEDs make it easy to see at a glance whether the module is powered and which relays are currently active.

This module is a popular choice for hobbyists and makers automating home appliances, lighting circuits, irrigation pumps, and small industrial equipment through microcontroller-based control systems. Its fault-tolerant design keeps the relay off if the control line is disconnected, adding an extra layer of safety to your automation projects. Available in 1, 2, and 4 channel versions, it scales easily from single-switch projects to multi-device control panels.

Specification:

• Operating Voltage : 5V DC
• Trigger Current : 5mA
• Trigger Mode : High/Low Level (Jumper Selectable)
• Isolation : SMD Optocoupler
• Max Load (NO Contact) : AC 250V/10A, DC 30V/10A
• Indicators : Power (Green), Relay Status (Red)