5v 4 Channel Relay shield module

The 4-Channel 5V Relay Shield Module is an efficient and reliable relay expansion board designed for controlling high-voltage and high-current electrical devices using low-power digital signals from microcontrollers such as Arduino, ESP32, Raspberry Pi, and other embedded systems. The module includes four independent 5V relays capable of switching external electrical loads safely and efficiently. Each relay channel features a red LED indicator that lights up when the relay is activated, allowing quick visual monitoring of relay status. Designed in a standard shield form factor, the module can be directly plugged into compatible development boards without complicated wiring. Its stackable design also allows additional expansion boards to be connected simultaneously. Each relay provides Normally Open (NO) , Normally Closed (NC) , and Common (COM) terminals for flexible switching configurations. The module supports both 5V and 3.3V logic control signals , making it highly compatible with modern microcontroller platforms. With onboard mounting holes and compact construction, the relay shield is ideal for smart home automation, industrial control, robotics, and DIY switching applications. Specifications Product Type: 4-Channel Relay Shield Module Operating Voltage: 5V DC Relay Model: HJR-4102-L-5V Relay Channels: 4 Control Signal Compatibility: 5V / 3.3V Relay Contact Type: NO / NC / COM Indicator LEDs: 4 Red LEDs Mounting Holes: 3 × M3 Positioning Holes Board Type: Standard Shield Interface Stackable Design: Yes Application Type: High-current and high-voltage switching Relay Terminal Description NO (Normally Open): Connected to COM only when relay is activated NC (Normally Closed): Connected to COM when relay is inactive COM (Common): Common switching terminal Applications Smart home automation Arduino relay control projects Industrial automation systems Remote appliance switching Lighting control systems Motor and pump control Robotics projects Security and alarm systems IoT switching applications DIY electronics projects