Pinhaijing LAN Ethernet 2 Way Relay Board
4.8Editor score
Affordable entry-level solution
Simple TCP UDP controller
Compact PCB design
In this guide
Ethernet Relay Modules are essential tools for modern automation and industrial control systems. They enable reliable remote switching of electrical devices over networks. Choosing the right one ensures stability, safety, and efficient integration into your existing infrastructure for critical tasks.
We evaluated ten leading models based on protocol support, power options, and build quality. Our analysis focuses on Modbus TCP capabilities, PoE readiness, and isolation features. This list helps you find a module that matches your specific project needs and technical requirements.
Each pick highlights key strengths, ideal use cases, and potential limitations. We include detailed specs, pros, and cons to guide your decision. Prices and availability change frequently, so verify current listings on the product pages before purchasing your chosen device.
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 WiFi and Bluetooth LE
PoE and RS485 support
Waveshare 8-Ch Ethernet Relay Module (B)
4.9Editor score
High reliability industrial grade
Digital input support included
Web browser configuration
Top 10 Best Ethernet Relay Module in 2026 Compared
The following table provides a side-by-side comparison of all ten reviewed models. It highlights core specifications like channel count, communication protocols, and power inputs to help you quickly identify the best fit for your automation needs.
ProductsSpecificationsEditor scorePrice
Best Budget
8-CH Ethernet Relay Module
8 Channels
Modbus RTU TCP
PoE Power Support
Rail-mount Case
3.4Editor score
Editor's Choice
Waveshare 8-Ch Ethernet Relay Module
8 Channels
Modbus RTU TCP
PoE Communication
Industrial Grade
4.1Editor score
Editor's Choice
Industrial 8-Ch ESP32-S3 WiFi Relay
ESP32-S3 MCU
WiFi Bluetooth LE
RS485 Port
PoE Module
4.8Editor score
8-CH Ethernet Relay Module (B)
8 Channels
Digital Input Support
HTTP MQTT Modes
Wide Power Input
4.9Editor score
Industrial 8-Ch ESP32-S3 WiFi Relay
ESP32-S3 MCU
WiFi Bluetooth Dual
RS485 Ethernet
Digital Input
4.6Editor score
Waveshare 30-Ch Ethernet Relay Module
30 Channels
Modbus RTU TCP
PoE Port
Smart Home App
4.2Editor score
Waveshare Industrial 8-Channel ESP32-S3
Xtensa Processor
240MHz Speed
Isolated RS485
PoE Optional
4.7Editor score
Waveshare 8-Ch Ethernet Relay Module (B)
8 Channels
Digital Input Linkage
Flyback Diode
Rail Mounted
4.2Editor score
Pinhaijing LAN Ethernet 2 Way Relay
2 Channels
Web Server Mode
Password Protection
STC Controller
4.8Editor score
8-CH Ethernet Relay Module
8 Channels
Modbus Protocol
PoE Support
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
WiFi Bluetooth LE
RS485 interface
PoE module
This Industrial 8-Ch ESP32-S3 WiFi Relay Module stands out as our top pick due to its powerful dual-core processor and versatile connectivity. It combines Ethernet, RS485, and wireless protocols in a robust package designed for demanding environments.
Pros
- High performance dual-core processor
- Versatile wireless and wired options
- Strong isolation protection circuits
- Supports Arduino IDE easily
- Reliable industrial grade design
Cons
- Higher cost than basic models
- Requires configuration setup time
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The onboard ESP32-S3 microcontroller provides up to 240MHz processing speed, ensuring fast response times for critical automation tasks. Its integrated WiFi and Bluetooth LE allow for flexible remote control, while the PoE port simplifies installation by delivering power and data over one cable.
While it offers premium features, users should note the complexity of initial setup compared to simpler plug-and-play devices. The learning curve is justified by the reliability and flexibility it brings to complex industrial or smart home systems.
Buyers seeking a high-performance module that supports both legacy and modern protocols will find this unit ideal. It is particularly suited for projects requiring precise timing, extensive digital inputs, and secure remote access capabilities.
Advanced Wireless Connectivity
Integrated 2.4GHz Wi-Fi and Bluetooth LE allow seamless remote control without complex cabling.
Industrial Grade Isolation
Multiple protection circuits including power isolation and optocoupler isolation ensure safe operation in high-voltage environments.
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2. 8-CH Ethernet Relay Module – Standard Industrial Choice
8-CH Ethernet Relay Module
8 Channels
Modbus RTU TCP
PoE Support
Rail-mount Case
This 8-CH Ethernet Relay Module offers a straightforward solution for industrial control applications requiring Modbus compatibility. It provides essential features like PoE support and rail-mount casing for easy integration into standard cabinets.
Pros
- Supports Modbus protocols
- PoE power option available
- ABS rail-mount case
- Flash-on/off functions
Cons
- Lower user rating
- Basic feature set
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The module supports flash-on and flash-off functions, which can be useful for testing or signaling purposes. It uses an onboard optocoupler to protect against high-voltage interference, ensuring safer operation in electrical control panels.
However, user feedback suggests potential stability issues or limited documentation compared to more expensive brands. Buyers should verify compatibility with their specific control systems before purchasing to avoid integration hurdles.
It is suitable for projects with strict budget constraints where basic Modbus communication is the primary requirement. Users comfortable with technical troubleshooting may find this unit adequate for simpler monitoring tasks.
Modbus Protocol Support
Adopts Modbus RTU and Modbus TCP protocols for seamless integration with existing industrial networks and PLCs.
Power Flexibility
Supports DC 7-36V wide range input as well as PoE power supply for versatile installation options.
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3. Waveshare 8-Ch Ethernet Relay Module – Reliable Industrial Grade
Waveshare 8-Ch Ethernet Relay Module
8 Channels
Modbus RTU TCP
PoE Communication
Industrial Grade
The Waveshare 8-Ch Ethernet Relay Module is designed for reliability in industrial settings. It features robust isolation and protection circuits, making it a safer choice for environments with high-voltage circuits or frequent electrical disturbances.
Pros
- Strong protection circuits
- LED network indicators
- Easy rail installation
- MQTT support
Cons
- Mid-range price point
- Requires Ethernet knowledge
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Its rail-mounted ABS case allows for secure installation in control panels. The module includes LED indicators for monitoring MCU and network signal status, which aids significantly in troubleshooting connectivity issues during operation.
While it performs well, it may lack the advanced processing power of WiFi-enabled models. Users needing simple Ethernet control will find it sufficient, but those requiring wireless flexibility might look elsewhere.
This module is best for users who prioritize hardware reliability and physical protection over advanced software features. It serves well in steady industrial automation tasks where wired connections are the norm.
Network Monitoring
Four LEDs and network indicators provide clear visual feedback on device status and signal transmission.
Protection Features
Reverse-proof circuits and optocoupler isolation prevent accidental damage from incorrect wiring or voltage spikes.
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4. 8-CH Ethernet Relay Module (B) – Best for Input Integration
8-CH Ethernet Relay Module (B)
8 Channels
Digital Input Support
HTTP MQTT Modes
Wide Power Input
This model distinguishes itself by combining eight relay outputs with eight digital inputs, offering a complete control solution. The high user rating reflects its reliability and ease of use for advanced automation needs.
Pros
- Includes digital inputs
- Web browser configuration
- High user rating
- Versatile power options
Cons
- More complex configuration
- Requires network setup
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Configuration is flexible, supporting software and web browser interfaces. This allows users to set up dynamic IPs and DNS connections without needing specialized desktop tools, simplifying the initial deployment process.
The inclusion of HTTP and MQTT protocols alongside Modbus makes it highly compatible with modern cloud platforms. It is ideal for users building custom IoT dashboards or integrating with third-party cloud services.
Ideal for users needing both output switching and input monitoring in one unit. It is particularly recommended for smart home or industrial projects where sensor data input is required alongside relay control.
Integrated Input Support
Supports passive dry contact and active wet contact digital inputs for comprehensive monitoring.
Flexible Communication
Multiple modes including TCP Server, Client, UDP, and HTTP allow seamless integration with diverse networks.
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5. Industrial 8-Ch ESP32-S3 WiFi Relay – Versatile Wireless Control
Industrial 8-Ch ESP32-S3 WiFi Relay
ESP32-S3 MCU
WiFi Bluetooth Dual
RS485 Ethernet
Digital Input
Similar to the top pick, this module offers robust wireless capabilities with Ethernet options. It supports RS485 alongside WiFi and Bluetooth, making it a versatile choice for mixed-protocol industrial environments.
Pros
- Strong SDK resources
- Dual wireless modes
- RS485 support
- Reliable isolation
Cons
- Price higher than standard
- Setup requires technical skill
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The comprehensive SDK and online development resources make it easier for developers to customize functionality. Tutorials and technical support are available to assist with integration into complex automation systems.
While it shares features with other ESP32-S3 models, its specific focus on digital inputs adds value for sensor integration. It ensures safe operation through multiple isolation protection circuits within the board design.
Best for developers and engineers needing a flexible platform for both industrial and smart home projects. Its combination of wired and wireless protocols ensures broad compatibility across various systems.
Development Support
Comprehensive SDK, online resources, and tutorials make custom development and troubleshooting easier for users.
Dual Mode Connectivity
Integrated WiFi and Bluetooth LE dual-mode wireless communication ensures flexible remote control options.
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6. Waveshare 30-Ch Ethernet Relay Module – High Channel Count
Waveshare 30-Ch Ethernet Relay Module
30 Channels
Modbus RTU TCP
PoE Port
Smart Home App
This 30-channel module is designed for large-scale applications where many control points are needed. It retains the industrial grade build quality and Modbus protocol support found in the smaller versions.
Pros
- Highest channel count
- Suitable for large scale
- Stable driving chip
- Flyback protection
Cons
- Larger physical size
- Higher cost overall
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The dedicated relay driver chip with flyback diode protection ensures stronger driving ability. This is critical when controlling high-current loads or multiple devices simultaneously without risking signal degradation.
While it is ideal for farms or industrial plants, it may be overkill for small home projects. Users should ensure their network switch can handle the increased traffic from more devices.
Best for users managing large arrays of devices that require centralized control. Its design prioritizes reliability and capacity, making it suitable for commercial or agricultural automation.
Large Scale Control
Designed for Industrial Control, Smart Home, Smart Agriculture, and farming applications requiring high channel counts.
Driver Protection
Dedicated relay driver chip with built-in flyback diode protection ensures stronger stable driving ability.
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7. Waveshare Industrial 8-Channel ESP32-S3 – Optimized Processor
Waveshare Industrial 8-Channel ESP32-S3
Xtensa Processor
240MHz Speed
Isolated RS485
PoE Optional
This model features an Xtensa 32-bit LX7 dual-core processor running at 240MHz. It offers high performance for complex logic tasks alongside standard relay switching capabilities.
Pros
- High speed processor
- RTC for scheduling
- USB Type-C
- Rich Wiki resources
Cons
- Optional PoE limits setup
- Higher learning curve
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An onboard RTC chip allows for scheduled tasks, which is useful for automation without constant external triggering. The USB Type-C port provides convenient access for power and firmware downloading.
The isolated RS485 interface ensures safety when connecting to external sensors. However, users should note that PoE is an optional version, which may affect cabling choices in some installations.
Best for projects requiring precise timing or complex logic processing. Users who value official documentation and community support will appreciate the rich Wiki resources provided.
High Performance
Xtensa 32-bit LX7 dual-core processor running at up to 240MHz delivers high performance.
Scheduling Capabilities
Built-in RTC chip supports scheduled tasks for automated timing without external controller intervention.
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8. Waveshare 8-Ch Ethernet Relay Module (B) – Enhanced Safety
Waveshare 8-Ch Ethernet Relay Module (B)
8 Channels
Digital Input Linkage
Flyback Diode
Rail Mounted
This variant emphasizes enhanced safety and control features like debouncing algorithms and toggle control. These features reduce false triggers and allow for more intuitive interaction with connected devices.
Pros
- Toggle control feature
- Debounce algorithm
- Dedicated driver
- Rail-mounted enclosure
Cons
- Similar to other B models
- Requires PoE adapter
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The reverse-proof circuit prevents damage from incorrect connections, a vital feature for field installations where wiring errors can occur. High-quality relays with clear ratings ensure safe operation under specified loads.
While it shares many traits with similar models, the inclusion of linkage control allows for conditional automation based on input states. This reduces the load on external controllers for simple logic tasks.
Ideal for environments where wiring safety and input filtering are priorities. It provides a solid balance of industrial durability and smart control features for automation engineers.
Input Logic
Relay supports digital input linkage control or toggle control based on signal state changes.
Reliability Features
Built-in debouncing algorithm and dedicated relay driver chip ensure stable and accurate relay operation.
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9. Pinhaijing LAN Ethernet 2 Way Relay Board – Cost Effective
Pinhaijing LAN Ethernet 2 Way Relay Board
2 Channels
Web Server Mode
Password Protection
STC Controller
This compact board offers a simple and affordable entry into Ethernet relay control. It is designed for light-duty applications like small appliances or basic switching needs.
Pros
- Very affordable
- Simple web interface
- Password protection
- Compact size
Cons
- Limited channels
- Basic features
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It supports a web server mode controlled via password protection, ensuring secure access. The STC microcontroller provides stable industrial performance at a much lower cost than advanced modules.
Users should be aware of the limited channel count. It is not suitable for large systems but works well for isolated tasks like controlling a fan or light remotely.
Best for hobbyists or small projects needing remote control without complex integration. Its compact size and low price make it accessible for DIY users with limited budgets.
Simple Control
Provides remote control via internet or local network with simple TCP/UDP commands.
Secure Access
Includes local password protection to ensure only authorized users can access the device.
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10. 8-CH Ethernet Relay Module – Standard Relay Option
8-CH Ethernet Relay Module
8 Channels
Modbus Protocol
PoE Support
Rail-Mount Case
This model offers a standard configuration for those needing basic Modbus and PoE capabilities. It includes DNS support for connecting to domain names without needing static IP configurations.
Pros
- Modbus compatibility
- DNS support
- Standard rail case
- PoE capable
Cons
- Average performance
- Basic interface
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It features optocoupler isolation and flash-on/off functions similar to other industrial options. While it performs adequately, it lacks the extra digital input features of premium models.
Users should verify their network setup supports DHCP and DNS if using those features. The rail-mount case ensures it fits in standard electrical panels without custom mounting.
Best for basic industrial tasks requiring reliable Ethernet switching without advanced logic. It serves as a cost-effective alternative for larger projects needing multiple standardized units.
DNS Integration
Supports connecting to domain name server via DNS protocol for easier network identification.
Installation
Industrial grade rail-mount case allows for safe installation in standard electrical cabinets.
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Buying Guide – How to Choose the Best Ethernet Relay Module
Selecting the right Ethernet Relay Module depends on your specific project requirements. Consider connectivity options, channel counts, and physical design to ensure compatibility with your existing systems.
Communication Protocols
Most industrial modules support Modbus RTU or TCP protocols. Ensure the device supports the protocol your controller or software uses to avoid compatibility issues during integration.
Look for support for HTTP, MQTT, or UDP if you plan to use web-based dashboards or cloud services for monitoring and control.
Power Options
Power supply flexibility is critical for installation ease. Modules supporting Power over Ethernet (PoE) simplify cabling by combining data and power transmission in one cable.
Check if the unit supports a wide voltage input range such as 7 to 36V DC to accommodate various power sources in industrial environments.
Channel Count
Determine how many devices you need to control. Some units offer 2 or 8 channels, while others support up to 30. Select a count that meets your needs without unnecessary complexity.
Higher channel counts may require more physical space and network bandwidth, so balance capacity with your actual project requirements.
Physical Design and Durability
Industrial environments require robust housing. Look for ABS rail-mount cases that fit standard DIN rails for secure installation in control panels.
Verify the build quality and isolation features to ensure the device can withstand electrical noise and high-voltage interference common in factory settings.
Digital Input Support
Some models include digital inputs alongside relays. This allows for monitoring sensor states or triggering actions based on external signals without additional controllers.
Ensure inputs support both dry and wet contacts if you need to connect various types of switches or sensors to the module.
Processing Power and Features
Advanced modules may include microcontrollers like ESP32-S3 for on-board logic and scheduling. This reduces dependency on external processors for complex tasks.
Check for features like flash-on/off or debounce algorithms that can simplify your control logic and improve system reliability.
Connectivity Options
While Ethernet is the focus, some devices also offer WiFi or RS485. This versatility can be valuable if your network includes legacy serial buses or wireless zones.
Ensure the device supports the necessary network standards, such as TCP Server or Client modes, to integrate smoothly with your network architecture.
Configuration Methods
Ease of setup is important for deployment. Some modules allow configuration via a web browser, while others require software tools. Choose the method that suits your technical comfort level.
Look for support for DHCP and DNS configuration to make addressing the device on your network more straightforward and flexible.
How to Use and Care for Your Ethernet Relay Module
Start by connecting the power source to the module. If using PoE, ensure your switch supports the required standard. Otherwise, connect the DC input terminals securely, observing correct polarity to prevent damage.
Connect the device to your network via Ethernet. Use the provided web interface or software to assign an IP address. Verify connectivity by pinging the device or accessing its web server.
Once online, configure the relay settings according to your automation needs. Test each channel manually to ensure proper operation before integrating with external controllers or software systems.
Frequently Asked Questions
Can I use these modules with non-standard networks?
Most modules are designed to work with standard TCP/IP networks. However, you should check the manual for specific VLAN or security settings. Custom configurations may require advanced networking knowledge to implement correctly.
Is special software required for configuration?
Many modern modules support browser-based configuration, reducing the need for proprietary software. However, some industrial models may require specific drivers or tools for advanced settings. Always check the product documentation before purchase.
How do I protect the module from electrical noise?
Select a model with optocoupler isolation and flyback diode protection. Additionally, use shielded cables and ensure proper grounding in your installation. This minimizes interference from high-voltage equipment nearby.
What is the typical load capacity for these relays?
Most industrial units support up to 10A at 250VAC or 30VDC. Always check the specific rating on the device to ensure it handles your load safely. Overloading can cause permanent damage to the relay contacts.
Can I control the relay from outside my local network?
Yes, if your router is configured for port forwarding or you use cloud MQTT services. Ensure you secure the connection with strong passwords. Remote access adds convenience but requires careful network security planning.
What if the module stops responding?
First check physical power and Ethernet connections. Then reset the device using the reset button or power cycle. If issues persist, review the logs or contact the vendor for firmware updates or support assistance.
Are there limitations on the number of connected devices?
The module itself has a fixed number of channels, but network traffic depends on your switch. Avoid flooding the network with too many status checks. Use polling intervals to manage traffic efficiently.
Do these modules support wireless connectivity?
Some models include built-in WiFi and Bluetooth for flexible control. Others may require an external wireless adapter. Check the specs carefully to determine if wireless features are included in the package.
Final Thoughts on Choosing the Best Ethernet Relay Module
The Industrial 8-Ch ESP32-S3 WiFi Relay Module and the Waveshare B series offer excellent balance between performance and flexibility. These choices are best for those needing advanced control and reliable industrial integration.
For budget-conscious projects, the Pinhaijing board provides a simple and affordable entry point. It is ideal for small tasks where high channel counts are not required. Always prioritize safety features regardless of the price point.
Prices and stock availability change frequently. Verify current listings and specifications on the provided product pages before making a final decision. Ensure the model you choose meets all your specific project requirements.