2 Channel Relay Module 12 V

12V 2 Channel Relay Module with Optical Isolation

Product Description

The 12V 2 Channel Relay Module with Optical Isolation is a dual-channel relay board designed to control high-voltage or high-current electrical loads using a low-power control signal from a microcontroller or control system. It uses photocoupler isolation to provide electrical separation between the control circuit and relay switching section, helping improve protection against electrical interference.

The module features two independent relay channels, allowing two separate loads to be controlled. The relay can be triggered through the IN1 and IN2 control inputs. The module supports low-level triggering, where the relay activates when the corresponding input is pulled LOW and releases when the input returns HIGH.

Each relay channel provides switching capability up to 10A at 250V AC or 10A at 30V DC, making the module suitable for controlling lamps, motors, solenoids, fans, pumps, and other compatible electrical loads.

The board provides separate VCC and JD_VCC power connections for the control and relay power sections. A jumper is provided for convenient power configuration when using the default relay supply arrangement.

Features

• 2-channel relay module
• 12V relay module
• Optical/photocoupler isolation
• Good resistance to electrical interference
• Low-level trigger operation
• Independent IN1 and IN2 control inputs
• Relay status indicator LEDs
• Separate VCC and JD_VCC power connections
• Supports high-current and high-voltage load switching
• Suitable for microcontroller-based control systems
• Compact and easy-to-integrate design

Specifications

Parameter	Specification
Product Type	2 Channel Relay Module
Number of Channels	2
Relay Coil Voltage	12V
Trigger Type	Low Level
Isolation	Photocoupler / Optical Isolation
Relay Contact Rating	10A
Maximum AC Load	250V AC / 10A
Maximum DC Load	30V DC / 10A
Control Inputs	IN1, IN2
System Power	VCC, GND
Relay Power	JD_VCC
Status Indicator	LED
Relay Configuration	NO, NC, COM

Pin Configuration

Pin	Function
VCC	Positive pole of system/control power supply
GND	Negative pole of system/control power supply
IN1	Relay Channel 1 control input
IN2	Relay Channel 2 control input
JD_VCC	Relay power supply input

Design and Construction

The module is built on a compact PCB containing two electromechanical relays, optical isolation components, driver circuitry, indicator LEDs, and screw terminals for convenient load connections.

The photocouplers provide isolation between the control signal and relay circuitry, helping reduce the effect of electrical noise and interference generated by connected loads.

The relay contacts provide COM, NO, and NC terminals, allowing users to configure loads for normally open or normally closed operation according to the application.

Working Principle

The module receives control signals through IN1 and IN2. When a channel receives the required low-level trigger signal, its corresponding relay is energized and the status indicator LED turns on.

When the control signal is released, the relay returns to its inactive state and the indicator LED turns off.

The relay electrically switches the connected load through its COM, NO, and NC contacts. The optical isolation separates the control signal from the relay switching circuit, providing improved electrical isolation between the controller and load side.

Wiring Instructions

• VCC: Connect to the positive terminal of the system/control power supply.
• GND: Connect to the negative terminal of the system/control power supply.
• IN1: Control input for Relay Channel 1.
• IN2: Control input for Relay Channel 2.
• JD_VCC: Connect to the relay power supply as required by the module configuration.

The onboard jumper can be used according to the intended power configuration. Verify the module’s relay voltage and wiring before applying power.

Applications

• Arduino relay control
• ESP32 and ESP8266 projects
• Home automation
• Lighting control
• Pump control
• Fan control
• Motor switching
• Solenoid control
• Industrial automation prototypes
• DIY electronics
• IoT projects
• Robotics
• Appliance control
• Automated switching systems

Package Includes

• 1 × 12V 2 Channel Relay Module with Optical Isolation

Product Disclaimer

Relay contact ratings represent the maximum specified switching capacity and should not automatically be treated as suitable for every load type. Motors, pumps, transformers, and other inductive loads may require additional protection and appropriate switching considerations.

High-voltage AC and high-current DC connections can be hazardous. Use proper insulation, wiring, fusing, and safety precautions during installation.

Product images are for representation only. The actual product may differ slightly in appearance, colour, component placement, or terminal configuration depending on the manufacturing batch.