Description

• 🔑 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.

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  📊 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

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  🔌 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.

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  🛠 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.

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  📦 Package Includes

  • 1× 4-Channel 5V Relay Module.

  • (Optional) Jumper caps & mounting screws.

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  ⚡ 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.