Description
Product Description
The 4-Channel 5V Opto-Isolated Relay Module is the definitive solution for projects demanding both reliable high-power switching and absolute protection for sensitive control electronics. This module perfectly bridges the gap between low-voltage microcontrollers and high-power AC/DC loads by incorporating advanced optocoupler isolation on every channel. Each of the four channels features a high-quality electromagnetic relay, but unlike non-isolated designs, the control signal is first passed through an optical isolator. This creates a complete electrical barrier, ensuring that voltage spikes, electrical noise, and potential ground loops from the load side cannot damage your Arduino, Raspberry Pi, or other controller.
Offering selectable high or low-level trigger via a convenient jumper, this module provides unmatched flexibility to match any control logic, from simple microcontroller outputs to industrial PLC signals. The integration of status LEDs for both relay activation and opto-isolation, combined with robust screw terminals, makes it a professional-grade component. Whether you’re building a reliable home automation system, a noise-resistant industrial interface, or a complex prototype, this opto-isolated relay module delivers safety, versatility, and peace of mind in a compact and user-friendly package.
Key Features
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Full Optical Isolation per Channel: Each input is protected by an optocoupler, providing 2500Vrms of isolation to shield your microcontroller from high-voltage transients and noisy load circuits.
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Selectable Trigger Logic: A simple jumper for each channel allows selection between High-Level (active-HIGH) or Low-Level (active-LOW) trigger, ensuring compatibility with any control system.
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Four Independent High-Current Relays: Control up to four separate AC or DC circuits with relays rated for 10A, suitable for a wide range of appliances and equipment.
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Dual Status Indication: Features two LEDs per channel: one indicates the opto-isolator is activated by the control signal, and another shows the physical state of the relay, providing clear diagnostic feedback.
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Integrated Flyback Protection: Each relay coil includes a flyback diode to suppress voltage spikes when de-energizing, protecting the driving transistor and ensuring long-term reliability.
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5V Logic Level Compatible: Designed for direct use with 5V microcontrollers like Arduino, with inputs that are easy to drive from standard digital pins.
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Secure & Safe Connections: All high-power load connections use screw terminals, while control connections use a standard pin header for a clean and reliable setup.
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Robust PCB Design: Built with high-quality components and a clear, silkscreened layout for easy installation and integration.
Main Parameters
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Channels: 4 Independent Relays
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Control Signal Voltage: 5V DC (TTL Logic)
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Trigger Mode: High or Low Level (Jumper Selectable per channel)
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Isolation Rating: 2500V RMS (Optocoupler)
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Relay Contact Rating: 10A @ 250VAC / 10A @ 30VDC
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Relay Type: Electromagnetic, SPDT (Single Pole Double Throw)
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Input Current: ~5mA per channel (to activate optocoupler)
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Dimensions: Approx. 120mm x 75mm x 20mm
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