🔑 Key Features

✅ 4 Independent Relays – Control multiple devices simultaneously. ✅ 5V Control Signal – Works with Arduino, ESP, Raspberry Pi. ✅ Optocoupler Isolation – Protects MCU from voltage spikes. ✅ High/Low Level Trigger Selectable (Jumper-configurable). ✅ LED Status Indicators – Visual feedback for each relay. ✅ Wide Load Compatibility – Supports AC (250V/10A) & DC (30V/10A). ✅ Screw Terminal Connectors – Easy wiring for high-voltage devices.

📊 Technical Specifications

• Control Voltage: 5V DC (Logic level)

• Trigger Current: ~15-20mA per channel

• Max Load per Relay:

  • AC: 250V / 10A

  • DC: 30V / 10A

• Relay Type: Electromechanical (SPDT – Normally Open + Normally Closed contacts)

• Optical Isolation: Yes (PC817 optocoupler)

• Trigger Mode: High/Low level (jumper-selectable)

• Dimensions: 70mm × 56mm × 19mm

🔌 Wiring & Usage

1. Control Pins (Connect to MCU)

• VCC: 5V power supply

• GND: Common ground

• IN1, IN2, IN3, IN4: Signal pins (5V TTL)

2. Load Connections (Screw Terminals)

• NO (Normally Open): Circuit closes when relay activates.

• COM (Common): Central contact.

• NC (Normally Closed): Circuit opens when relay activates.

⚠ Warning:

• Do not exceed 250V AC / 10A to prevent fire hazards.

• Isolate high-voltage wiring from control circuits.

🛠 Applications

• Smart home automation (lights, fans, appliances).

• Industrial machine control.

• IoT projects (cloud-controlled switches).

• Safety cutoffs & emergency shutdowns.

• Arduino/ESP8266/ESP32-controlled power strips.

📦 Package Includes

• 1× 4-Channel 5V Relay Module.

• (Optional) Jumper caps & mounting screws.

⚡ Why Choose This Relay Module?

✔ Optoisolation – Safer for microcontrollers vs. non-isolated relays. ✔ Dual Trigger Modes – Works with both active HIGH/LOW signals. ✔ LED Feedback – Instant relay status visibility. ✔ Compact & Breadboard-Compatible – Fits most project enclosures.