| Feature | Details |
| Coil Voltage | 12V DC |
| Channels | 4 Independent Channels |
| Max AC Load | 10A @ 250V AC / 10A @ 125V AC |
| Max DC Load | 10A @ 30V DC / 10A @ 28V DC |
| Isolation | Onboard Quad Optocouplers |
| Configuration | 4 x SPDT (NO, NC, COM) |
Product Description
The 12V 4-Channel Relay Module is a powerful multi-output interface designed for systems where a 12V DC power rail is already established. It allows a single microcontroller or PLC to manage up to four high-power circuits independently. Each of the four channels is equipped with its own Optocoupler, which provides full galvanic isolation between the 12V relay coils and the 3.3V/5V logic input. This prevents electrical spikes and back-EMF from interfering with your processor, making it a reliable choice for automotive projects, multi-zone lighting, and complex industrial sequencing.
Key Highlights
Quad Independent Control: Manage four separate AC or DC devices simultaneously using four digital GPIO pins.
Full Opto-Isolation: Four dedicated optocouplers ensure the signal circuit is physically separated from the relay power, providing excellent protection against noise.
Standard Industrial Voltage: Designed to operate directly from 12V lead-acid batteries or 12V industrial power supplies without additional voltage regulation.
Onboard Signal LEDs: Every channel features an individual indicator LED that lights up when the relay is triggered, allowing for rapid visual diagnostics.
JD-VCC Jumper System: Allows for complete separation of the relay coil power and the microcontroller logic power to eliminate Ground loop interference.
Technical Specifications
Trigger Current: 5mA to 10mA per channel
Logic Compatibility: 3.3V to 5V (Trigger input)
Coil Resistance: ~400 $\Omega$ per channel
Dimensions: ~75mm x 55mm x 18.5mm
Pin Configuration: VCC, GND, IN1, IN2, IN3, IN4
Prototyping & Installation Tip
To use this module, a stable 12V DC supply is mandatory for the VCC and GND pins to energize the internal coils. Most modules are Active Low, meaning a logic "LOW" from your controller turns the relay ON. If you are controlling inductive loads like large AC motors or pumps, consider adding a snubber circuit to further protect the relay contacts from arcing. For automotive installations, ensure the module is mounted in a location protected from moisture and vibration.
Note: This product is the 12V 4-Channel Relay Module ONLY. 12V power source and jumper wires are sold separately. Product images are for illustration purposes only.