12V Dual Channel Relay Module
12V Dual Channel Relay Module Original price was: 245৳ .Current price is: 195৳ .
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12V 4 Channel Relay Module
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12V 4 Channel Relay Module

SKU: EBL-1091

Specifications:

  • 4-Channel relay interface board with independent control
  • High-current relay support: AC250V 10A / DC30V 10A
  • Opto-isolated inputs for enhanced safety and noise reduction
  • LED indicators for real-time relay output status

Original price was: 339৳ .Current price is: 290৳ .

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Description

🔌 12V 4 Channel Relay Module

Quad Channel | 10A High Power Switching | Industrial Automation Relay Board

📌 Overview

The 12V 4 Channel Relay Module is a high-power switching board designed to control four independent AC or DC devices using a 12V control signal.

It is ideal for:

  • Industrial automation

  • Smart home systems

  • Motor and pump control

  • Lighting automation

  • Robotics and embedded systems

Each channel includes a 12V electromagnetic relay capable of handling heavy electrical loads safely.

⚡ Relay Specifications

Feature Specification
Relay Type Electromagnetic
Coil Voltage 12V DC
Channels 4
Contact Rating 10A 250VAC
Contact Rating 10A 30VDC
Relay Model SRD-12VDC-SD-C / JQC-3FF (varies by board)

🔌 Input Pin Configuration

Pin Function
VCC 12V Power Supply
GND Ground
IN1 Channel 1 Control
IN2 Channel 2 Control
IN3 Channel 3 Control
IN4 Channel 4 Control

Some versions include:

  • High/Low trigger selection jumper

  • JD-VCC for external relay power isolation

🔄 Trigger Modes

Depending on the version:

  • 🔹 Low Level Trigger → Relay activates when input is LOW

  • 🔹 High Level Trigger → Relay activates when input is HIGH

Some boards allow selecting trigger mode via jumper.

🔌 Output Terminals (Per Channel)

Each relay has three screw terminals:

Terminal Function
COM Common
NO Normally Open
NC Normally Closed

Operation:

Relay OFF:

  • COM connected to NC

Relay ON:

  • COM connected to NO

🧠 Working Principle

  1. Control signal applied to IN pin.

  2. Driver transistor energizes relay coil.

  3. Magnetic switching mechanism changes contact.

  4. External device turns ON or OFF.

Provides electrical isolation between low-voltage control circuit and high-voltage load.

💡 Onboard Features

✔ 4 × 12V relays
✔ Transistor driver circuits
✔ Flyback diode protection
✔ 4 × Relay status LEDs
✔ Power LED
✔ Screw terminal blocks
✔ Mounting holes
✔ Optional optocoupler isolation (model dependent)

📐 Electrical Specifications

Parameter Value
Supply Voltage 12V DC
Control Current ~20–30mA per channel
Max Switching Current 10A per channel
Isolation Mechanical (Optical in some versions)

📏 Physical Specifications

  • PCB Color: Blue / Black

  • Large rectangular board

  • 4 mounting holes

  • Standard 2.54mm header interface

  • Industrial-grade components

🎯 Advantages

✔ Control four devices independently
✔ High voltage & current handling
✔ Reliable and durable
✔ Suitable for industrial systems
✔ Easy microcontroller integration
✔ Good isolation for safety

📦 Applications

  • Industrial control panels

  • Smart irrigation systems

  • HVAC systems

  • Motor control

  • Pump automation

  • Power distribution control

  • IoT-based switching systems

  • Home automation projects

🆚 12V 2-Channel vs 4-Channel

Feature 2 Channel 4 Channel
Devices Controlled 2 4
Board Size Medium Larger
Automation Level Moderate Advanced
Suitable For Small systems Large automation

🧑‍💻 Example Control Code (Concept)

int relay1 = 2;
int relay2 = 3;
int relay3 = 4;
int relay4 = 5;

void setup() {
pinMode(relay1, OUTPUT);
pinMode(relay2, OUTPUT);
pinMode(relay3, OUTPUT);
pinMode(relay4, OUTPUT);
}

void loop() {
digitalWrite(relay1, HIGH);
digitalWrite(relay2, HIGH);
digitalWrite(relay3, HIGH);
digitalWrite(relay4, HIGH);
delay(2000);

digitalWrite(relay1, LOW);
digitalWrite(relay2, LOW);
digitalWrite(relay3, LOW);
digitalWrite(relay4, LOW);
delay(2000);
}

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