Description
Description
The 2-Channel 5V Opto-Isolated Relay Module is a professional-grade, dual-channel switching solution designed for microcontroller-based automation, PLC systems, and industrial control applications. Operating on a standard 5V DC supply—compatible with Arduino, Raspberry Pi, ESP32, STM32, 8051, AVR, PIC, DSP, ARM, and TTL logic devices—this module enables safe and reliable control of high-power AC and DC loads using low-voltage logic signals .
Each of the two independent channels features a Single-Pole Double-Throw (SPDT) relay rated for 10A at 250V AC or 30V DC, making it suitable for controlling lights, motors, pumps, solenoids, fans, and household appliances . The module incorporates optocoupler isolation between the control side and the load side, providing complete galvanic isolation that protects your sensitive microcontroller from voltage spikes, back EMF, and electrical noise generated by inductive loads .
The module includes a jumper-selectable high/low level trigger function, allowing you to configure each channel independently for active-high or active-low operation without modifying your code or hardware . Dual LED indicators—a red power LED and two green status LEDs—provide clear visual feedback of relay states. An additional VCC-JD-VCC jumper allows optional separation of the relay power supply from the logic power supply, enabling you to power the relays from an external source for heavy-load applications .
The PCB features four 3.1mm mounting holes for secure installation and is compatible with DIN rail mounting adapters (sold separately). The screw terminal blocks provide reliable, vibration-resistant connections for load wiring, while the 4-pin male header (2.54mm pitch) accepts standard Dupont jumper wires for easy integration with development boards .
Whether you are building a smart home automation system, controlling industrial machinery, managing greenhouse irrigation, or prototyping an Arduino-based project, this 2-channel relay module delivers robust, isolated, and flexible switching performance in a compact, easy-to-use package.
Key Features
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Dual Independent Channels – Two SPDT relays allow simultaneous control of two separate loads with individual trigger inputs .
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Opto-Isolated Inputs – Complete galvanic isolation between control logic and load circuits protects microcontrollers from voltage spikes and electrical noise .
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Selectable Trigger Mode – Jumper-configurable per channel for High-Level Trigger (active HIGH) or Low-Level Trigger (active LOW) operation .
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10A High-Current Relays – Each relay rated for 10A at 250V AC or 30V DC, suitable for controlling lights, motors, pumps, and household appliances .
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SPDT Contact Configuration – Each relay provides Normally Open (NO), Normally Closed (NC), and Common (COM) terminals for flexible wiring .
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Separate Relay Power Option – VCC-JD-VCC jumper allows the relay coils to be powered from an external source for heavy-load applications .
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LED Status Indicators – Green power LED and two red relay status LEDs provide clear visual confirmation of operation .
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Wide Logic Compatibility – Works with 3.3V and 5V logic signals from Arduino, Raspberry Pi, ESP32, STM32, and other microcontrollers .
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Screw Terminal Connections – Heavy-duty screw terminal blocks for reliable load wiring and easy installation .
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Compact Form Factor – 50mm x 41mm x 18.5mm dimensions with 3.1mm mounting holes for secure installation; compatible with DIN rail adapters .
Technical Parameters
| Parameter | Value |
|---|---|
| Operating Voltage | 5V DC (±10%) (4.5V – 5.5V) |
| Logic Supply Current | ≤ 30 mA (relays idle) / ≤ 80 mA (both relays active) |
| Trigger Current per Channel | 5 mA – 20 mA |
| Trigger Modes | High-Level (active HIGH) or Low-Level (active LOW) – jumper selectable |
| Relay Contact Rating | 10A / 250V AC or 10A / 30V DC (resistive load per channel) |
| Output Configuration | SPDT per channel – COM, NO, NC terminals |
| Isolation Method | Optocoupler (PC817 or equivalent) – full galvanic isolation |
| Module Dimensions | 50 x 41 x 18.5 mm (L x W x H) |
| Operating Temperature | -40°C to +85°C |
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