Product Description
The 2 Channel 12V Relay Module with Optocoupler is a versatile and professional-grade interface designed for reliable, isolated control in 12V-based systems. This module acts as a secure and intelligent bridge between 12V logic signals from controllers, Programmable Logic Controllers (PLCs), or automotive systems and various high-power AC or DC loads. Its core innovation is the integration of advanced optocouplers for both channels, creating a critical 2500V electrical isolation barrier. This barrier completely separates your sensitive 12V control electronics from the potentially noisy and hazardous high-voltage/current load side, ensuring immunity from damaging voltage spikes, ground loops, and electromagnetic interference.
Engineered for maximum flexibility, the module features selectable high-level or low-level trigger logic for each channel via simple jumpers. This provides seamless compatibility with any 12V control signal type, whether sourcing (PNP) or sinking (NPN). Combining dual high-current relay outputs, clear status indicators, and secure screw terminal connections, this compact module is the ideal solution for applications requiring robust, protected, and flexible dual-circuit switching, from industrial sensors to smart automotive accessories.
Key Features
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Dual-Channel Opto-Isolation: Both independent channels are protected by individual optocouplers, providing 2500Vrms of isolation to shield your 12V controller from load-side electrical noise and transients.
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Selectable Trigger Logic: Each channel can be configured for High-Level (active on +12V) or Low-Level (active on 0V) trigger via a jumper, ensuring compatibility with all 12V control outputs.
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Industrial 12V DC Compatibility: Designed for direct integration into standard 12V control environments common in industrial, automotive, and automation applications.
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High-Current Relay Outputs: Features two robust electromagnetic relays with SPDT contacts, each rated to switch loads up to 10A at 250VAC or 30VDC.
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Clear Visual Feedback: Dual LEDs per channel provide immediate status: one indicates opto-isolator input activation, and the other confirms physical relay switching.
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Secure & Reliable Connections: All high-power load and DC power inputs use reliable screw terminals for safe, vibration-resistant installations.
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Integrated Voltage Spike Protection: Each relay coil includes a flyback diode to suppress inductive kickback, protecting the driving circuitry and ensuring longevity.
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Compact & Versatile Design: A small footprint makes it easy to integrate into control panels, enclosures, or space-constrained projects.
Main Parameters
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Channels: 2 Independent Relays
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Control Voltage: 12V DC
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Trigger Mode: High or Low Level (Jumper Selectable)
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Isolation Voltage: 2500V RMS
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Relay Contact Rating: 10A @ 250VAC / 10A @ 30VDC
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Relay Type: Electromagnetic, SPDT
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Input Current (per channel): ~5-10mA
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Dimensions: Approx. 80mm x 55mm x 20mm
Typical Applications / Usage
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Industrial Sensor/Actuator Interface: Safely connect a 12V PLC to control two independent actuators, solenoid valves, or indicator lights.
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Automotive Accessory Control: Manage two high-power accessories (e.g., a light bar and a winch) from a 12V switch or vehicle computer with complete noise isolation.
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Basic HVAC Control: Control a fan and a heater in a small environmental control or ventilation system using a 12V thermostat or timer.
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Security & Alarm Systems: Activate two separate alarms, sirens, or strobe lights based on 12V sensor inputs, with protection for the control panel.
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Prototyping & Testing: A reliable, isolated output module for engineers developing and testing 12V-controlled products or systems.
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Agricultural Controls: Automate two devices, such as a water pump and a ventilation fan, in a small greenhouse or irrigation setup.
Connection & Configuration Guide:
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Trigger Configuration: For each channel, place the jumper cap over the pins labeled “H” (High-Level trigger) or “L” (Low-Level trigger) to match your controller’s output logic.
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Power & Control Wiring: Connect a stable 12V DC power supply to the module’s VCC and GND terminals. Connect the two signal input pins (IN1, IN2) to the digital outputs of your 12V controller.
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Load Wiring: For each channel, connect the device’s power source to the relay’s COM terminal. Connect the device to the NO terminal to be powered when the relay activates.
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Critical Safety: Always disconnect all high-voltage power before wiring. Install the module in a proper insulated enclosure and follow all electrical safety codes.
Q: Why do I need an optocoupler on a 12V relay module?
The optocoupler provides electrical isolation, preventing noise, voltage spikes, and ground loops from the load circuit (e.g., a motor) from damaging or interfering with your sensitive 12V controller. This is crucial for reliability in noisy environments like vehicles or factories.
Q: My controller outputs 24V. Can I use this 12V module?
No, not directly. Applying 24V to the inputs or VCC will damage the module. You need a 24V-specific module or a voltage regulator to step down to 12V.
Q: Should I use High or Low-Level trigger?
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High-Level: Use if your controller outputs +12V to activate (common for PLC “sourcing” outputs).
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Low-Level: Use if your controller connects to ground (0V) to activate (common for “sinking” outputs).
Check your controller’s manual.
Q: What 12V power supply do I need?
You need a stable 12V DC supply. Each relay coil draws about 80-100mA when on. For both relays active, ensure your supply can provide at least 200mA continuously.
Q: Can I control a 3-phase motor with this?
No, not directly. This module uses single-pole relays. Control a 3-phase motor by using one channel to activate the coil of a 3-pole contactor, which switches the motor.
Q: The opto LED is on but the relay doesn't click. Why?
This usually means the relay coil is not getting power. Check that your 12V power supply connected to VCC is working and provides enough current. The opto-isolator and relay coil are on separate circuits.
Q: Can I switch AC and DC loads on the two channels?
Yes. The relay contacts are rated for both. You can have 120VAC on one channel and 24VDC on the other, as they are completely independent.
Q: Is this suitable for business or OEM use?
Yes. Its professional specs make it suitable for integration into commercial products, control panels, and OEM equipment. We offer volume pricing for business clients. Contact our sales team for details.
