Generic 2 Channel 12V Relay Module | Optocoupler Isolation | High Current Switching
₹149.00₹250.00 (price_including_tax) (-40%)
Achieve isolated, high-power switching with this 2-channel 12V relay module. Seamlessly integrate it into microcontroller projects to control AC/DC loads. Built for durability, ensuring long-term operational stability.
Reliable 2 Channel 12V Relay with optocoupler provides robust isolation and precise control for diverse projects.
Optocoupler technology isolates control logic from high-power loads, ensuring circuit integrity and safety.
Control two independent circuits with one module, simplifying designs and reducing component count easily.
Directly interfaces with Arduino, Raspberry Pi, and other microcontrollers for versatile automation projects.
The Engineering Behind 2 Channel 12V Relay Module
This 2-channel 12V relay module is engineered to provide isolated switching capabilities for various electronic circuits. At its core, it features two independent Songle SRD-12VDC-SL-C relays, allowing control of two separate high-power loads from a low-power microcontroller. The module incorporates optocoupler isolation, utilizing PC817 or similar optoisolators, which optically separate the control circuit (e.g., Arduino, Raspberry Pi) from the load circuit, preventing damage from voltage spikes or ground loops.
The structural execution of this module ensures robust performance. High-quality screw terminals facilitate secure connections for both control and load sides. Integrated flyback diodes protect the switching transistors from inductive load back-EMF, extending component lifespan. Designed for hobbyists and industrial applications, its pedagogical value lies in demonstrating fundamental electrical isolation and switching principles.
Optocoupler Isolation Architecture
The primary technical feature is the integrated optocoupler isolation. This mechanism uses a light-emitting diode (LED) and a phototransistor to transmit control signals across an optical barrier. This complete electrical separation safeguards sensitive microcontroller I/O pins from high voltages and currents present in the load circuit, significantly enhancing system reliability and preventing catastrophic failures in adverse electrical environments.
Versatile 2-Channel Switching
With two independent channels, this module resolves common operational pain points by allowing simultaneous or sequential control of two distinct AC or DC loads. This versatility eliminates the need for multiple single-channel modules, simplifying wiring, reducing board space, and streamlining project complexity, making it ideal for home automation, robotics, and industrial control systems.
Optimized for Performance & Integration
- Channels: 2 Independent Channels
- Operating Voltage: 12V DC (Control Side)
- Load Voltage Compatibility: Up to 250V AC / 30V DC
- Max Load Current: 10A per channel (resistive load)
- Isolation Method: Optocoupler (e.g., PC817)
- Input Logic Level: Active LOW (selectable via jumper for Active HIGH)
- Indicator LEDs: Power LED, 2 x Channel Status LEDs
- Mounting Holes: 4 x M3 standard mounting holes
Features & Benefits
- Dual Channel Control: Manages two separate high-power AC/DC loads simultaneously or independently.
- Optocoupler Isolation: Electrically separates sensitive control circuits from high-voltage load circuits, preventing damage.
- 12V DC Operation: Standard voltage for easy integration with common power supplies and microcontrollers.
- High Current Capacity: Switches up to 10A per channel, suitable for motors, lights, and appliances.
- Status Indicator LEDs: Provides visual feedback on relay activation and power status for quick debugging.
- Secure Screw Terminals: Ensures robust and reliable connections for both input control and output loads.
Pro-Grade Advantages
- Offers crucial galvanic isolation, protecting sensitive digital electronics from power surges.
- High current switching capacity makes it suitable for controlling a wide range of common appliances.
- Provides visual feedback with onboard LEDs, simplifying debugging and operational status checks.
- Standard pin headers and screw terminals ensure straightforward and secure wiring connections.
Technical Considerations
- Requires an external 12V DC power source, not directly powered by 5V microcontrollers.
- Inductive loads require additional snubbing or external protection for extended relay contact life.
What is the primary function of the optocoupler in this relay module?
The optocoupler electrically isolates the low-voltage control circuit (e.g., microcontroller) from the high-voltage load circuit, preventing voltage spikes and noise from damaging the sensitive control electronics.
Can this relay module switch AC and DC loads simultaneously?
Yes, each of the two independent channels can switch either an AC or a DC load, as long as it adheres to the specified voltage (up to 250V AC / 30V DC) and current (up to 10A) limits.
What control voltage is required to activate the relays?
While the module requires a 12V DC power supply, the control signals (IN1, IN2) are typically 3.3V or 5V logic levels compatible with most microcontrollers. The module typically uses active LOW trigger by default, meaning a LOW signal activates the relay.
How should I connect an inductive load like a motor to this relay?
For inductive loads, it’s highly recommended to add a flyback diode in parallel with the DC load or an RC snubber across the AC load to protect the relay contacts from damage caused by back-EMF during switching.
Is external power required for the relay module?
Yes, this 12V relay module requires a dedicated 12V DC power supply to energize its coils. The control signals from your microcontroller (e.g., 5V from Arduino) only switch the optocoupler’s LED, not the relay coil directly.
| Specification | Value |
|---|---|
| Number of Channels | 2 |
| Control Voltage (Coil) | 12V DC |
| Load Voltage (AC) | Up to 250V @ 10A |
| Load Voltage (DC) | Up to 30V @ 10A |
| Isolation Type | Optocoupler |
| Trigger Type | Active LOW (Jumper Selectable) |
| Relay Type | SPDT (Single-Pole Double-Throw) |
| Indicator LEDs | Power, 2 x Channel Status |
| Mounting Holes | 4 (M3 compatible) |
| Dimensions | Approx. 50mm x 40mm x 18mm |
Additional information
| Brand | Generic |
|---|---|
| Channels | 2 |
| Operating Voltage | 12V DC |
| Max Current | 10A per channel |
| Control Interface | Digital I/O (Active LOW/HIGH) |
| Technology | Electromechanical Relay with Optoisolation |
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