Name: Generic 2-Channel 12V Relay Module | Opto-Isolated | High Current Switching
Brand: Generic
SKU: OL-GEN-2CHRLY
Price: 149.00 INR
Availability: InStock

Robust Switching

Enables safe and reliable control of high-power devices using low-voltage signals efficiently.

Galvanic Isolation

Protects delicate microcontroller electronics from dangerous high-voltage spikes and electrical interference effectively.

Versatile Applications

Ideal for home automation, robotics, and industrial control systems requiring multiple switched outputs easily.

The Engineering Behind the 2-Channel 12V Relay Module

The 2-Channel 12V Relay Module serves as a critical interface between low-voltage control systems, such as microcontrollers (Arduino, Raspberry Pi), and higher-power AC or DC loads. Each channel incorporates a Songle SRD-12VDC-SL-C relay, a widely recognized electromechanical switch. The module’s design allows it to safely isolate the control circuit from the load circuit, preventing potential damage to sensitive electronics while enabling the switching of devices up to 10A at 250VAC or 30VDC.

Engineered for stability and ease of integration, the module features opto-couplers (e.g., PC817 or similar) for galvanic isolation, ensuring that electrical noise or voltage spikes from the load side do not interfere with the microcontroller. High-quality screw terminals provide secure connections for both the control signals and the high-power loads, suitable for repeated use in demanding prototyping and embedded applications.

Galvanic Isolation with Opto-Couplers

The integration of opto-couplers is paramount for protecting delicate control electronics. These components use light to transmit signals, completely isolating the electrical path between the microcontroller and the relay’s coil. This isolation effectively mitigates ground loops, prevents back-EMF spikes from inductive loads, and safeguards the microcontroller from high-voltage surges, significantly enhancing system reliability and longevity.

Versatile 12V Control & Load Compatibility

Operating on a standard 12V DC control voltage, this module is highly compatible with industrial power supplies and many embedded systems. Its dual channels allow for independent control of two distinct high-power loads, making it ideal for applications requiring multiple switched outputs. The common-normally open-normally closed (COM-NO-NC) contact configuration on each relay offers flexible switching options, adapting to various circuit designs and operational requirements without complex workarounds.

Optimized for Performance & Integration

Channels: 2 Independent Relays
Control Voltage: 12V DC
Load Capacity (AC): 10A @ 250VAC
Load Capacity (DC): 10A @ 30VDC
Isolation: Opto-Isolated Inputs
Indicator LEDs: Power & Channel Status
Mounting: Standard Mounting Holes

Features & Benefits

Dual Channel Control: Independently switch two separate high-power loads simultaneously, enhancing project versatility.
12V Operating Voltage: Compatible with common power supplies and industrial control systems for seamless integration.
Opto-Isolated Inputs: Protects sensitive microcontroller circuitry from high-voltage spikes and electrical noise.
High Current Capacity: Safely switch AC loads up to 10A/250VAC and DC loads up to 10A/30VDC.
LED Status Indicators: Provides clear visual feedback on relay activation and power status, aiding in debugging.
Robust Screw Terminals: Ensures secure and reliable connections for both control and load wires, preventing disconnections.

Pro-Grade Advantages

Offers galvanic isolation, safeguarding control electronics.
High current switching capability for diverse loads.
Clearly marked terminals and status LEDs for easy setup.
Standard 12V control voltage for broad compatibility.

Technical Considerations

Requires external 12V power supply for relay coils.
Not suitable for very high-frequency switching applications.

What is the primary function of a 2-channel 12V relay module?

The module enables microcontrollers to switch on or off two independent high-power AC or DC devices using low-voltage digital signals, providing electrical isolation.

How does opto-isolation benefit my microcontroller project?

Opto-isolation uses light to transmit signals, physically separating the control circuit from the high-voltage load circuit. This protects the microcontroller from voltage spikes, noise, and potential damage.

What are the maximum load specifications for each relay channel?

Each relay channel is typically rated to switch up to 10 Amperes at 250 Volts AC or 10 Amperes at 30 Volts DC, making it suitable for a wide range of loads.

Can this module be directly connected to an Arduino or Raspberry Pi’s digital output pins?

Yes, the control inputs (IN1, IN2) can be connected to digital output pins. However, the relay coil power (VCC, GND) requires a stable 12V DC supply, separate from the microcontroller’s power if necessary.

What types of loads can be controlled by this relay module?

This module can control various resistive, inductive, or capacitive loads such as lights, small motors, solenoid valves, heating elements, and other appliances, provided they do not exceed the relay’s current and voltage ratings.

Specification	Value
Relay Model	Songle SRD-12VDC-SL-C
Number of Channels	2
Operating Voltage (Coil)	12V DC
Control Signal Voltage	3.3V / 5V / 12V compatible (via jumper settings or direct connection)
Max Load Current	10A (AC/DC per channel)
Max Load Voltage (AC)	250V AC
Max Load Voltage (DC)	30V DC
Isolation Type	Opto-coupler (e.g., PC817)
Indicators	1x Power LED, 2x Channel Status LEDs
Terminal Type	Screw Terminals
Mounting Holes	Yes

Additional information

Brand	Generic
Operating Voltage	12V DC
Max Current	10A (per channel)
Channels	2
Control Voltage	12V DC (logic input compatible with 3.3V/5V via appropriate configuration)