5V Single Channel Relay Module with Screw Terminals

5V Single Channel Isolated Relay Module with Optocoupler Protection

The 5V Single Channel Relay Module is an essential component for electronics enthusiasts and professionals looking to control high-voltage circuits safely. This industrial-grade relay board features optocoupler isolation, screw terminals, and LED status indicators, making it perfect for IoT projects, home automation systems, and industrial control applications. With a 10A/250V AC switching capacity and TTL compatibility, it bridges the gap between low-voltage microcontrollers (like Arduino, ESP8266, Raspberry Pi) and high-power electrical devices.

Technical Specifications

Key Features

• ✅ Optically isolated input protects your microcontroller from voltage spikes
• ✅ Industrial-grade relay with 10A switching capacity
• ✅ Low trigger current (5-20mA) works with 3.3V/5V logic
• ✅ Transparent cover protects relay while allowing visual inspection
• ✅ Dual LEDs show power status and relay activation state
• ✅ Compact 50mm × 40mm × 20mm PCB with mounting holes
• ✅ High-quality copper alloy contacts for reliable switching
• ✅ Screw terminals accommodate up to 2.5mm² wires

Common Applications

• 🛠️ Home automation (lighting, appliances control)
• 🛠️ IoT projects with ESP8266/NodeMCU
• 🛠️ Industrial equipment control systems
• 🛠️ Security systems and access control
• 🛠️ Automotive electronics projects
• 🛠️ Laboratory test equipment
• 🛠️ Agricultural automation (pumps, irrigation)
• 🛠️ Robotics and mechatronics projects

How to Use This Relay Module

Step 1: Connect 5V DC power to VCC and GND pins
Step 2: Wire your control signal (from Arduino, etc.) to the IN pin
Step 3: Connect your load between COM and NO/NC terminals
Note: For inductive loads (motors, solenoids), always use a flyback diode across the coil

Frequently Asked Questions

Q: Can this handle 220V AC loads?
A: Yes, it's rated for 250V AC at 10A maximum

Q: Is this compatible with Raspberry Pi?
A: Absolutely! Works with 3.3V GPIO pins

Q: What's the difference between NO and NC terminals?
A: NO (Normally Open) closes when relay activates, NC (Normally Closed) opens

Q: How much current does the coil draw?
A: Approximately 70mA when energized

Important Considerations

• ⚠️ Always de-energize before making wiring changes
• ⚠️ Don't exceed maximum current ratings
• ⚠️ Use proper insulation for high-voltage connections
• ⚠️ For inductive loads, add protective components

Upgrade Possibilities

• 🔧 Add WiFi/Bluetooth control with an ESP-01 module
• 🔧 Implement multi-relay stacking for more channels
• 🔧 Integrate with smart home platforms (Home Assistant)
• 🔧 Add current sensing for load monitoring

Why Choose Our Relay Module?

• ⭐ Higher quality relay than generic boards (100,000+ operations)
• ⭐ Thicker PCB traces for better current handling
• ⭐ Proper optoisolation for microcontroller safety
• ⭐ Clear documentation and support available
• ⭐ Consistent performance across temperature ranges

Final Thoughts

This professional-grade 5V relay module offers exceptional value for makers and engineers needing reliable high-voltage switching. Whether you're building a smart home system, industrial controller, or educational project, its robust design and safety features ensure trouble-free operation. The included optocoupler protection makes it significantly safer than basic relay modules, while the screw terminals provide secure connections for both prototype and permanent installations.