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  • CONTROLLABLE with 5V or 3.3V SIGNAL. Power supply: 12V (Vcc)
  • Equipped with high-current relay 7A@250VAC / 10A@24VDC
  • It can be used to control both AC and DC appliances such as Solenoids, Motors, lights, fans, etc
  • High quality screw terminals (Terminal Block) provided (C, NC , NO) for quick and easy connection
  • ULN2003 IC used to drive Relays (better than Transistor Drive Circuits)

4 Channel 12V ULN2003 based Relay Board

Relay board module is used for controlling higher current loads from your microcontroller development board, PC parallel port or Arduino Uno. This board has four (4) on-board relay which can switch up to 7Amps. Relays terminals (C, NC, NO) are accessible through screw terminals which makes wiring up the board very easy.

The relay is safely driven by ULN2003 IC hence your input device, such as Arduino, is protected from the relay circuit and IC will further protect your microcontroller from relay kickback. This is a 12V 4-Channel Relay interface board which can be controlled directly by a wide range of microcontrollers such as Arduino, AVR, PIC, ARM, 8051 and so on.

It can control both AC and DC appliances such as Solenoids, Motors, lights, fans, etc- High-quality screw terminals (Terminal Block) provided (C, NC, NO) for quick and easy connection- Input Signal Pin connected to Burg stick for easy accessibility- LED Status indicators to indicate the relay ON/OFF status.- Mounting holes provided

Package Includes:

  • 1 x 4 Channel 12V ULN2003 based Relay Board


Power supply 12V (Vcc)
Number of Channels 
Colour  Multicolour 
Dimensions  5 x 3 x 1 cms 
Weight 5 grams

Shipping & Returns

  • All orders confirmed before 3 pm IST are shipped on the
    same day, barring rare pickup delays on holidays or disturbances
  • Delivery time in Metro cities is 1-3 days, Others it is
    3-7 days. It varies based on location, reliant on courier services
  • Return window: 7 days from receipt unless stated
    otherwise. No refunds/replacements after
  • Returns only for non-working/damaged products are accepted
  • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
  • Refunds are processed within 3-4 working days post inspection and approval.

For more details, please check our Shipping and Return Policy

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1. How to connect a 4 relay module to Arduino?

  • It's very easy to connect the 4 relay modules to the Arduino  and  you can control many devices through the Arduino including  AC and DC. In this example, we will connect a simple load like an LED to the output of the relay and drive it with the Arduino. First, connect the Arduino's 5V to the 4-relay module's VCC, and the Arduino's ground  to the 4-relay module's ground. Next, we need to connect the communication pins IN1, IN2, IN3 and IN4 to the Arduino data pins 7, 6, 5 and 4. A 3V battery is used to light the LED. So I connected the positive side of the battery to the positive side of the LED, the negative side to the COM of each relay, and the NO to the negative side of the LED.

2. What are the applications of 8  channel relay module?

  • The 8-channel relay is isolated, safe, reliable, and anti-interference.  8 channel relay is widely used for all MCU control, industrial field, PLC control and smart home control. It can be directly connected to and  controlled  by microcontrollers such as Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic.