Pinhaijing LAN Ethernet 2 Way Relay Board
4.8Editor score
TCP UDP web server control
Military grade PCB material
Compact 6.8×4.8cm size
In this guide
Ethernet relay modules provide robust connectivity for industrial automation and smart home systems. These devices allow precise control of high voltage loads through standard network protocols ensuring safe remote operation across various environments.
We evaluated ten leading models focusing on communication standards reliability and ease of integration. Our analysis covers Modbus support power options and isolation features to help you select the right hardware for your specific project needs.
Each product listing highlights key specifications and real world performance metrics. Please note that availability and pricing can fluctuate so verify current details on the retailer site before making your final purchasing decision for your setup.
Top 3 Picks for Best Ethernet Relay Module
Industrial 8-Ch ESP32-S3 WiFi Relay Module
4.8Editor score
ESP32-S3 dual-core processor
Integrated Wi-Fi and Bluetooth
RS485 and Ethernet ports
Waveshare 8-Ch Ethernet Relay Module (B)
4.9Editor score
Modbus RTU TCP protocols
PoE power supply support
Digital input isolation
Top 10 Best Ethernet Relay Module in 2026 Compared
This side-by-side comparison highlights the core specifications and capabilities of each selected module to help you quickly identify the best fit for your connectivity and control requirements.
ProductsSpecificationsEditor scorePrice
Best Budget
8-CH Ethernet Relay Module
Modbus RTU TCP protocol
PoE power supply
8-channel relay output
Optocoupler isolation
3.4Editor score
Editor's Choice
Waveshare 8-Ch Ethernet Relay Module
Modbus RTU TCP protocol
PoE power supply
Rail-mount ABS case
MQTT protocol support
4.1Editor score
Editor's Choice
Industrial 8-Ch ESP32-S3 WiFi Relay Module
ESP32-S3 microcontroller
Wi-Fi and Bluetooth LE
RS485 interface
PoE module built-in
4.8Editor score
8-CH Ethernet Relay Module (B)
Modbus RTU TCP protocol
8-channel digital input
PoE power supply
Web browser config
4.9Editor score
Industrial 8-Ch ESP32-S3 WiFi Relay Module
ESP32-S3 microcontroller
Wi-Fi and Bluetooth LE
RS485 interface
Arduino IDE support
4.6Editor score
Waveshare 30-Ch Ethernet Relay Module
Modbus RTU TCP protocol
30-channel relay output
PoE power supply
Industrial rail-mount case
4.2Editor score
Waveshare Industrial 8-Channel ESP32-S3
ESP32-S3 microcontroller
240MHz processor speed
Isolated RS485
PoE Ethernet port
4.7Editor score
Waveshare 8-Ch Ethernet Relay Module (B)
Modbus RTU TCP protocol
Digital input support
PoE power supply
Relay driver chip
4.2Editor score
Pinhaijing LAN Ethernet 2 Way Relay Board
TCP UDP web server
2-way relay output
STC microcontroller
Compact PCB size
4.8Editor score
8-CH Ethernet Relay Module
Modbus RTU TCP protocol
PoE power supply
Web browser config
Rail-mount case
4.0Editor score
1. Industrial 8-Ch ESP32-S3 WiFi Relay Module – Best Overall Ethernet Relay Module
Industrial 8-Ch ESP32-S3 WiFi Relay Module
ESP32-S3 dual core
Wi-Fi and Bluetooth LE
RS485 interface support
PoE power module
This industrial module stands out with its ESP32-S3 microcontroller offering high performance and versatile connectivity options. It achieves an excellent rating due to its robust build and extensive feature set suitable for complex automation tasks.
Pros
- Powerful dual core processor
- Multiple communication options
- Strong isolation protection
- Flexible power input
- Built-in PoE module
Cons
- Higher price point
- Complex setup options
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The board supports Wi-Fi Bluetooth and Ethernet alongside RS485 allowing seamless integration into diverse networks. Its digital inputs accept both dry and wet contacts with optocoupler isolation ensuring safe signal handling in noisy environments.
While the feature rich design offers great flexibility it may require more configuration time than simpler boards. The cost is higher but justified by the superior processing power and multiple interface options available on a single board.
Ideal for advanced users needing wireless and wired control in one package this module delivers reliability and speed. Its PoE capability simplifies cabling making it a top choice for modern industrial and smart infrastructure projects.
Versatile Connectivity Options
With integrated Wi-Fi Bluetooth and RS485 this module supports various network topologies for maximum flexibility.
Robust Protection Features
Optocoupler and power isolation protect sensitive electronics from high voltage interference and surges.
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2. Pinhaijing LAN Ethernet 2 Way Relay Board – Best Budget Ethernet Relay Module
Pinhaijing LAN Ethernet 2 Way Relay Board
TCP UDP controller
Web server interface
STC microcontroller
Compact design
This compact relay board offers a cost effective solution for basic network controlled switching tasks. Users praise its simple setup and reliable performance making it ideal for small scale home automation or testing projects.
Pros
- Affordable pricing
- Simple web interface
- Compact footprint
- Easy local control
- Reliable STC chip
Cons
- Only two channels
- Limited protocol support
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The module features a built-in web server allowing control via standard browsers without extra software. Its military grade PCB ensures durability while the small size fits easily into tight enclosures or limited space areas.
However the two channel limit restricts its use in larger systems requiring multiple outputs. The lack of advanced industrial protocols like Modbus means it suits simpler applications focused on basic on off control needs.
Best for hobbyists or budget constrained projects this board delivers solid performance for its price. Its straightforward design and local network access make it a practical choice for entry level Ethernet relay applications.
Simple Web Control
Control relays directly through any web browser using the integrated server interface for easy access.
Compact and Durable
Military grade materials ensure longevity while the small footprint saves space in crowded panels.
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3. Waveshare 8-Ch Ethernet Relay Module (B) – Best Premium Ethernet Relay Module
Waveshare 8-Ch Ethernet Relay Module (B)
Modbus RTU TCP
Digital input support
PoE power
Wide voltage range
This premium module delivers exceptional reliability with comprehensive Modbus RTU and TCP protocol support. Its high rating reflects consistent performance in industrial settings where stable communication and safety features are critical for operations.
Pros
- Excellent reliability
- Full Modbus support
- PoE power option
- Digital input isolation
- Web configuration tools
Cons
- Higher cost
- Learning curve for protocols
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It includes eight digital inputs alongside relays enabling full monitoring and control via network commands. The PoE support simplifies installation by delivering power and data through a single cable reducing wiring complexity significantly.
The advanced features require understanding of networking protocols which may challenge beginners. Pricing is higher than basic units but the robust construction and extensive functionality justify the investment for professional deployments.
Ideal for professional automation systems this module offers top tier performance and safety. Its compatibility with standard industrial networks makes it a powerful tool for scalable and secure remote control applications.
Industrial Protocol Support
Full Modbus RTU and TCP compliance ensures seamless integration with PLCs and SCADA systems.
PoE Integration
IEEE 802.3af PoE support reduces cabling needs and simplifies power delivery in hard to reach areas.
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4. 8-CH Ethernet Relay Module – Solid Modbus Choice
8-CH Ethernet Relay Module
Modbus RTU TCP
PoE support
Rail-mount case
Flash function
This module provides essential Modbus and MQTT capabilities for basic Ethernet control needs. It offers a straightforward design suitable for simple automation tasks requiring reliable network based switching and monitoring functions.
Pros
- Standard Modbus support
- Rail-mount case
- PoE power option
- Flash function included
- MQTT protocol support
Cons
- Lower rating score
- Basic documentation
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The included flash on and flash off commands add flexibility for timing sequences. Support for MQTT allows integration with cloud platforms making it useful for IoT deployments needing lightweight messaging protocols.
Some users report inconsistent performance or unclear configuration steps leading to a lower rating. While features are adequate the user experience may vary depending on prior experience with industrial networking setups.
Best for simple projects needing basic Modbus connectivity this module offers value. Ensure you have the necessary networking knowledge to configure it properly for optimal operation and reliability.
MQTT Integration
Built-in MQTT support enables easy connection to cloud services and IoT platforms.
Flash Commands
Programmable flash functions allow quick automated cycling of outputs for testing or alerts.
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5. Waveshare 8-Ch Ethernet Relay Module – Reliable Industrial Grade
Waveshare 8-Ch Ethernet Relay Module
Modbus RTU TCP
PoE port
Rail-mount ABS
MQTT support
Waveshare delivers a dependable unit with a robust rail-mount case designed for industrial environments. The inclusion of PoE and MQTT expands its utility for modern networked automation applications requiring flexibility.
Pros
- Industrial case design
- PoE power support
- LED status indicators
- MQTT capability
- Optocoupler isolation
Cons
- Standard feature set
- Setup can be complex
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LED indicators clearly show MCU and network status aiding in troubleshooting and monitoring. Optocoupler isolation protects circuits from interference ensuring stable operation even in electrically noisy conditions.
Setup may require familiarity with network protocols and configuration tools. While reliable it offers standard features compared to more advanced microcontroller based options available in the current market.
Suitable for professionals needing a sturdy Ethernet relay this module balances cost and durability. Its clear status indicators and industrial casing make it a practical choice for fixed installations.
Clear Status Monitoring
Multiple LEDs provide instant visual feedback on network and module status for easier debugging.
Optocoupler Isolation
Protects low voltage electronics from high voltage spikes ensuring system safety and longevity.
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6. Industrial 8-Ch ESP32-S3 WiFi Relay Module – Versatile Wireless Option
Industrial 8-Ch ESP32-S3 WiFi Relay Module
ESP32-S3 MCU
Ethernet and RS485
Wi-Fi and Bluetooth
Relay input
This module combines Ethernet wired serial and wireless links in a single versatile package. The ESP32-S3 microcontroller provides ample processing power for custom logic and local data handling without external computers.
Pros
- Strong processing power
- Mixed connectivity
- Reliable isolation
- Arduino IDE support
- Wide voltage range
Cons
- Requires dev knowledge
- Higher cost
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Arduino IDE compatibility simplifies development for users familiar with open source toolchains. Isolation circuits ensure safe switching of high voltage loads while maintaining signal integrity across noisy industrial environments.
Advanced capabilities demand some programming expertise to fully leverage. The price reflects the hardware quality but might exceed budgets for simple switching tasks that do not require complex logic.
Ideal for developers building custom automation solutions this board offers excellent flexibility. Its mix of wired and wireless options supports a wide range of applications from home projects to light industrial use.
Arduino IDE Support
Familiar development environment accelerates prototyping and deployment of custom control logic.
Multi-Protocol Interface
Combines Ethernet RS485 and wireless links for flexible network integration options.
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7. Waveshare 30-Ch Ethernet Relay Module – High Channel Count
Waveshare 30-Ch Ethernet Relay Module
30-channel output
Modbus RTU TCP
PoE power
Dedicated driver chip
This large format module offers thirty relay channels for complex multi point control systems. Its robust industrial design handles demanding applications where many signals must be managed centrally via Ethernet.
Pros
- High channel density
- Industrial design
- PoE support
- Relay driver chip
- Flyback diode protection
Cons
- High power draw
- Expensive unit
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The dedicated relay driver chip ensures stable performance across all channels under varying load conditions. Flyback diode protection guards against voltage spikes generated by inductive loads during switching operations.
Managing thirty channels increases power consumption and installation complexity. The cost is significant but necessary for projects requiring many isolated outputs in a single compact rail mount unit.
Perfect for large scale automation like agriculture or farming this unit delivers capacity and durability. Its PoE support reduces cabling complexity for extensive field deployments needing reliable remote switching.
High Channel Density
Thirty channels in one unit reduce wiring complexity and save space in control panels.
Flyback Diode Protection
Built-in protection safeguards against inductive kickback extending relay life and safety.
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8. Waveshare Industrial 8-Channel ESP32-S3 – High Speed Processor
Waveshare Industrial 8-Channel ESP32-S3
240MHz processor
Isolated RS485
PoE Ethernet
Xtensa dual core
Powered by an Xtensa dual-core processor this module delivers high speed performance for demanding tasks. Its industrial grade design ensures stability and longevity in challenging environments with rigorous operational demands.
Pros
- Fast processor speed
- Strong isolation
- Flexible power
- Rich documentation
- Dual-core performance
Cons
- Advanced features
- Setup complexity
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The isolated RS485 interface supports connection to Modbus sensors and other industrial modules seamlessly. PoE and wide voltage input options provide flexible deployment scenarios for varied power infrastructure.
Rich wiki resources and documentation facilitate development and troubleshooting for users. While feature rich it requires technical knowledge to utilize its full potential effectively in complex system integrations.
Recommended for advanced projects needing high performance and industrial standards this module excels. Its balanced combination of speed and connectivity makes it a strong contender for professional automation systems.
High Performance CPU
240MHz dual-core processor handles complex logic and concurrent tasks efficiently.
Isolated RS485
Protects the MCU from electrical noise on industrial communication lines.
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9. Waveshare 8-Ch Ethernet Relay Module (B) – Balanced Feature Set
Waveshare 8-Ch Ethernet Relay Module (B)
Modbus RTU TCP
Digital input
PoE power
Linkage control
This model offers a balanced mix of features including digital inputs and linkage control capabilities. Its industrial casing and PoE support make it suitable for fixed installations requiring reliable remote management.
Pros
- Relay input support
- Linkage control
- PoE power
- Debouncing algorithm
- Rail-mount case
Cons
- Mid-range price
- Standard config tools
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Built-in debouncing algorithms improve input signal quality ensuring accurate detection of switch states. Flash on and flash off functions add versatility for creating simple automated sequences without extra hardware.
Configuration is straightforward but may lack the depth found in more advanced programmable units. It serves well for standard relay control needs without requiring deep customization or custom code development.
A reliable choice for general purpose automation this module delivers consistent performance. Its linkage control features allow simple interlocking logic making it useful for safety or sequential operations.
Linkage Control
Digital inputs can trigger relays automatically enabling simple interlocking logic without external controllers.
Debounce Algorithm
Internal debouncing ensures clean signal processing even with noisy mechanical switches.
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10. 8-CH Ethernet Relay Module – Standard Modbus Unit
8-CH Ethernet Relay Module
Modbus RTU TCP
PoE power
Web config
Wide voltage input
A standard unit providing essential Modbus connectivity and power flexibility for basic needs. It supports a wide input voltage range and includes rail mount casing for professional integration into panels.
Pros
- Modbus support
- PoE power
- Web config
- Industrial case
- Optocoupler isolation
Cons
- Basic feature set
- Average performance
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Web configuration simplifies network setup for users familiar with browser based tools. The inclusion of Optocoupler isolation adds a layer of safety for high voltage switching scenarios in industrial settings.
Performance is adequate for straightforward tasks but lacks advanced programmability. Its design focuses on stability and standard protocol compliance rather than custom logic or rapid development support.
Best for users needing simple network relay control this unit offers value. It is a practical option for small industrial installations where standard Modbus protocols are sufficient for operations.
Wide Voltage Input
DC 7-36V range allows compatibility with various power supplies and industrial standards.
Web Configuration
Access setup menus through any web browser for convenient network parameter adjustments.
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Buying Guide – How to Choose the Best Ethernet Relay Module
Selecting the right relay module depends on your specific connectivity reliability and control needs.
Protocol Support
Check if the module supports Modbus TCP RTU HTTP or MQTT to match your existing network or SCADA system. Industrial setups often require Modbus while IoT projects may prefer MQTT for lightweight messaging.
Choose a protocol that aligns with your software stack and infrastructure requirements.
Number of Channels
Assess how many inputs and outputs you need. An 8-channel unit suits small automation while larger projects may need 30 channels or modular expansion options.
Ensure the unit offers enough channels to avoid overloading or complex wiring.
Power Options
Look for PoE support to simplify cabling by sending power and data over one Ethernet cable. Wide voltage input ranges add flexibility for sites with varying power sources.
PoE reduces wiring complexity and is ideal for remote or hard to reach locations.
Isolation Features
Optocoupler isolation protects sensitive electronics from high voltage spikes and electrical noise. Ensure inputs and outputs are isolated for safe operation in industrial environments.
Proper isolation prevents damage to your network hardware and connected devices.
Build Quality
Industrial grade rail-mount cases offer protection against dust and impacts. Look for dedicated relay drivers and robust PCB materials for reliable long term use.
Choose rugged enclosures that suit the physical conditions of your installation site.
Configuration Tools
Modules with web interfaces or CLI tools are easier to set up than those requiring proprietary software. Consider available documentation and community support for troubleshooting.
User friendly tools save time during initial setup and maintenance cycles.
Processing Power
Microcontroller based units allow custom logic and local processing which reduces server load. Standard relay boards handle switching but lack embedded intelligence for advanced tasks.
Select higher performance units if you need local data processing or custom automation logic.
Connectivity Options
Evaluate if you need Ethernet only or mixed options like Wi-Fi Bluetooth RS485. Wireless options offer flexibility but wired Ethernet ensures stable low latency control.
Match connectivity types to your network topology and distance requirements.
How to Use and Care for Your Ethernet Relay Module
Begin by connecting the module to your network via Ethernet and powering it through PoE or DC input. Access the web interface or configuration tool to assign static IP settings or confirm DHCP assignment.
Use the provided API documentation or Modbus tools to send commands for relay control. Test each output with a multimeter or indicator before connecting high voltage loads to ensure correct behavior.
Regularly inspect connectors and cables for damage and keep firmware updated to maintain security. Ensure proper heat dissipation if running multiple channels continuously to prevent overheating issues.
Frequently Asked Questions
What is the difference between Modbus TCP and Modbus RTU?
Modbus TCP runs over Ethernet networks using standard IP packets making it ideal for LAN connections. Modbus RTU is serial based typically used over RS485 or serial links for simpler point to point setups.
Can I use these modules with a home automation system?
Yes many modules support MQTT or HTTP which integrate with platforms like Home Assistant or OpenHAB. Check protocol compatibility and ensure your network can handle the device's communication needs.
Do I need special software to configure the relay module?
Most models include a web browser interface so no extra software is required. Some advanced units offer CLI or SDK tools but these are optional for basic configuration tasks.
Is PoE power reliable for industrial settings?
PoE compliant modules meet IEEE 802.3af standards ensuring stable power delivery. Use quality switches and cabling to prevent power fluctuations that could disrupt operation.
What safety features should I look for?
Optocoupler isolation and flyback diode protection are essential to safeguard low voltage electronics from high voltage surges. Ensure enclosures meet safety standards for the environment where they are installed.
Can I connect multiple modules on the same network?
Yes you can connect multiple modules by assigning each a unique IP address. Use switch or VLANs to manage traffic efficiently if connecting many devices on a single LAN.
Final Thoughts on Choosing the Best Ethernet Relay Module
This guide highlighted top picks ranging from budget friendly boards to industrial grade modules with advanced protocol support. The ESP32 based units offer flexibility for wireless needs while Modbus focused models suit traditional automation.
Prioritize isolation and power options to ensure safety and easy installation in your specific environment. Choose based on channel count and connectivity requirements to match your system design.
Always verify current product details and availability before purchasing since hardware specs and stock change. Consult documentation or support teams if you need help configuring your selected module.