Pinhaijing LAN Ethernet 2 Way Relay Board
4.8Editor score
Simple TCP UDP control interface
Compact PCB design with indicators
Affordable entry-level solution
In this guide
Ethernet Relay Modules are essential components for modern industrial automation and smart control systems. They enable seamless communication between computers and electrical devices over standard network infrastructure. Choosing the right module ensures reliability, safety, and efficient remote operation for your specific application needs.
We evaluated ten leading Ethernet Relay Modules based on protocol compatibility, power delivery options, and build quality. Our analysis focuses on industrial-grade features like Modbus support, PoE capability, and isolation circuits. This list helps you identify the most suitable hardware for your project requirements.
Each product entry details key specifications, pros, cons, and real-world application scenarios. We highlight unique capabilities such as wireless integration or advanced digital input handling. Note that availability and pricing may fluctuate, so verify current details before making a purchase decision for your setup.
Top 3 Picks for Best Ethernet Relay Module
Industrial 8-Ch ESP32-S3 WiFi Relay Module
4.8Editor score
Integrated WiFi and Bluetooth connectivity
Onboard RS485 and Ethernet ports
Built-in PoE power support
Waveshare Industrial 8-Channel ESP32-S3 WiFi Relay Module
4.7Editor score
Isolated RS485 interface included
Wide voltage input range support
Professional industrial enclosure design
Top 10 Best Ethernet Relay Module in 2026 Compared
The following table provides a side-by-side comparison of all ten Ethernet Relay Modules reviewed in this guide. It highlights key specifications such as channel count, communication protocols, power input options, and unique features to help you make an informed decision quickly.
ProductsSpecificationsEditor scorePrice
Best Budget
8-CH Ethernet Relay Module Modbus RTU TCP
8 Channel Relay Output
Modbus RTU TCP Protocol
PoE Power Supply Support
ABS Rail-Mount Case
3.4Editor score
Editor's Choice
Waveshare 8-Ch Ethernet Relay Module
8 Channel Relay Output
Modbus RTU TCP Protocol
Optocoupler Isolation
Rail-Mount ABS Case
4.1Editor score
Editor's Choice
Industrial 8-Ch ESP32-S3 WiFi Relay Module
ESP32-S3 Microcontroller
WiFi and Bluetooth LE
Onboard RS485 Interface
Digital Input Support
4.8Editor score
8-CH Ethernet Relay Module (B) with Digital Input
8 Channel Digital Input
Modbus RTU TCP Support
Multiple Communication Modes
Web Browser Configuration
4.9Editor score
Industrial 8-Ch ESP32-S3 WiFi Relay Module RS485
ESP32-S3 Processor
RS485 and Ethernet Ports
Passive Active Input
Arduino IDE Support
4.6Editor score
Waveshare 30-Ch Ethernet Relay Module
30 Channel Relay Output
Modbus RTU TCP Protocol
Dedicated Relay Driver
Industrial Control Focus
4.2Editor score
Waveshare Industrial 8-Channel ESP32-S3 WiFi Relay Module
Isolated RS485 Interface
240MHz Dual Core
PoE Ethernet Port
USB Type-C Debugging
4.7Editor score
Waveshare 8-Ch Ethernet Relay Module (B) with Digital Input
Digital Input Linkage
Flash On Off Function
Flyback Diode Protection
LED Status Indicators
4.2Editor score
Pinhaijing LAN Ethernet 2 Way Relay Board
2 Way Relay Output
TCP UDP Controller
Web Server Built-in
Military Grade PCB
4.8Editor score
8-CH Ethernet Relay Module Modbus RTU TCP PoE
8 Channel Relay Control
Modbus Protocol Support
PoE Power Supply
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 Processor
Integrated WiFi and Bluetooth LE
RS485 Ethernet PoE Ports
10A 250V AC Contact Rating
This Industrial 8-Ch ESP32-S3 WiFi Relay Module stands out as a top choice for modern automation needs. It combines wired Ethernet with wireless Bluetooth and WiFi capabilities on a single industrial-grade board. The high rating reflects its reliability and versatile connectivity options for diverse projects.
Pros
- Versatile wireless connectivity options
- Robust isolation protection circuits
- Direct home appliance control
- Supports Arduino IDE development
Cons
- Higher price point than basic modules
- Complexity may overwhelm beginners
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The onboard ESP32-S3 microcontroller provides significant processing power with dual-core performance up to 240MHz. It includes onboard digital inputs, RS485 interfaces, and Ethernet ports for comprehensive system integration. Optocoupler isolation ensures safety when interfacing with high-voltage circuits like 220VAC appliances.
While powerful, the feature set requires some technical knowledge to configure effectively. The price is higher than simpler relay boards, but the added functionality justifies the cost for professional deployments. It offers a balanced solution for those needing both legacy serial and modern network protocols.
Buyers seeking a future-proof control module for smart homes or industrial sites will find this ideal. It supports direct control of standard household appliances and offers multiple communication paths. We recommend it for users comfortable with microcontroller programming and network configuration.
Dual Wireless and Wired Connectivity
The module supports 2.4GHz Wi-Fi and Bluetooth LE alongside Ethernet, allowing flexible integration into existing networks without extra gateways.
Robust Industrial Protection
Built-in power and optocoupler isolation circuits protect the microcontroller from high-voltage interference, ensuring stable operation in demanding environments.
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2. Waveshare Industrial 8-Channel ESP32-S3 WiFi Relay Module – Best Premium Ethernet Relay Module
Waveshare Industrial 8-Channel ESP32-S3 WiFi Relay Module
Xtensa 32-bit LX7 Processor
Isolated RS485 Interface
PoE and USB-C Power
RTC Chip for Scheduling
The Waveshare Industrial 8-Channel ESP32-S3 WiFi Relay Module delivers premium build quality and advanced connectivity. It features an isolated RS485 interface alongside WiFi and Ethernet for robust industrial communication. The high rating confirms its suitability for demanding automation tasks.
Pros
- Professional isolation features
- High-speed processor performance
- Rich technical documentation
- Flexible power input options
Cons
- May require external enclosure
- Learning curve for all features
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Powered by an Xtensa 32-bit LX7 dual-core processor running at 240MHz, it handles complex tasks efficiently. Onboard indicators and RTC chips support scheduled operations and status monitoring. Optocoupler isolation protects against electrical interference from high-voltage loads.
This unit includes USB Type-C for power and debugging which simplifies development workflows. The dedicated Wiki resources provide extensive support for users. However, the full feature set may be overkill for simple on-off control needs.
Ideal for engineers requiring high reliability and multi-protocol support, this module excels in professional settings. It balances performance with safety features like flyback diode protection. We recommend it for projects needing precise timing and secure industrial networking.
Advanced Industrial Networking
The isolated RS485 interface allows direct connection to Modbus sensors or other industrial devices without signal degradation.
Comprehensive Developer Support
Official Wiki resources and debugging tools via USB-C ensure that users can quickly integrate and troubleshoot the device in their systems.
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3. Pinhaijing LAN Ethernet 2 Way Relay Board – Best Budget Ethernet Relay Module
Pinhaijing LAN Ethernet 2 Way Relay Board
2 Way Relay Output
TCP UDP Controller
Web Server Access
Military Grade PCB
This Pinhaijing LAN Ethernet 2 Way Relay Board offers an accessible entry point into networked control systems. It supports basic TCP UDP commands and includes a web server for easy remote management. Its strong rating highlights reliability despite the lower cost.
Pros
- Very affordable price point
- Simple web interface control
- Stable STC microcontroller
- Compact board design
Cons
- Limited to two channels only
- No PoE support included
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The module uses an STC microcontroller for industrial stability and includes status indicator lights for each relay. It accepts 5V or 9-24V input making it compatible with many power sources. The military grade PCB material ensures durability under standard operating conditions.
While it lacks advanced features like Modbus or wireless options, it fulfills basic remote switching needs effectively. The compact size makes it suitable for tight spaces where larger industrial modules won't fit. It is best suited for small-scale home or office projects.
Buyers looking for a cost-effective solution to control two devices remotely will find this highly valuable. The web interface simplifies setup without requiring programming. We recommend it for hobbyists or light commercial applications needing simple Ethernet control.
Easy Web-Based Control
The built-in web server allows users to control relays via any standard browser, removing the need for custom software installation.
Reliable Hardware Base
Constructed with military grade FR-4 sheet material, the PCB ensures long-term durability and resistance to environmental stress.
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4. 8-CH Ethernet Relay Module Modbus RTU TCP – Standard Ethernet Relay Module
8-CH Ethernet Relay Module Modbus RTU TCP
8 Channel Relay Output
Modbus RTU TCP Protocol
PoE Power Supply
Flash On Off Function
This 8-CH Ethernet Relay Module provides standard industrial control capabilities with Modbus RTU TCP protocol support. It features PoE power supply and a rail-mount case for easy installation in panels. While the rating is lower, it serves specific protocol-focused applications well.
Pros
- Direct Modbus integration
- PoE power capability
- Wide voltage input range
- Compact rail-mount case
Cons
- Lower rating than competitors
- Basic feature set
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The device includes a flash-on flash-off function allowing automatic timing without external logic. It supports DC 7 to 36V input which covers many industrial power standards. Optocoupler isolation helps protect the internal circuitry from high-voltage interference.
Users note that setup may require careful attention to protocol configuration compared to more user-friendly alternatives. The contact rating of 10A is sufficient for most standard switching tasks. It is best used where Modbus compatibility is a primary requirement.
For applications needing reliable Ethernet communication with legacy Modbus systems, this module offers a straightforward path. The PoE support reduces cabling complexity in some setups. We suggest verifying protocol documentation before purchase to ensure compatibility with your controller.
Modbus Protocol Support
Native support for Modbus RTU and TCP allows seamless integration with SCADA systems and industrial PLCs.
Simplified Power Cabling
Power over Ethernet capability allows the device to receive both data and power through a single network cable.
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5. Waveshare 8-Ch Ethernet Relay Module – Reliable Ethernet Relay Module
Waveshare 8-Ch Ethernet Relay Module
8 Channel Relay Output
Modbus RTU TCP Support
PoE Power Supply
Industrial Rail-Mount Case
The Waveshare 8-Ch Ethernet Relay Module offers solid performance with Modbus RTU TCP protocol adherence. It includes PoE power support and comes in an industrial grade rail-mount case. LED indicators help monitor MCU and network status easily during operation.
Pros
- Strong isolation protection
- Network status indicators
- Flash function included
- Robust build quality
Cons
- Similar to other models
- Limited documentation online
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Features include flash-on and flash-off functions for timed relay actions. The onboard optocoupler isolation prevents interference from high-voltage circuits ensuring safety. Reverse-proof circuitry protects against accidental incorrect connections during installation.
This module is reliable for general industrial control but shares features with other Waveshare products. It is a good choice for users needing standard Ethernet relay functionality without extra complexity. The network indicators assist in troubleshooting connectivity issues quickly.
Buyers should consider this for systems requiring stable network-based switching with minimal configuration. The rail-mount design fits well in standard electrical enclosures. We recommend checking current compatibility with your specific Modbus master device.
Network Status Monitoring
Four LEDs and network indicators provide clear visual feedback on MCU health and data transmission status at a glance.
Safety Protection Circuits
Built-in reverse-proof and optocoupler isolation circuits protect the hardware from electrical faults and dangerous voltage spikes.
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6. 8-CH Ethernet Relay Module (B) with Digital Input – Input Capable Ethernet Relay Module
8-CH Ethernet Relay Module (B) with Digital Input
8 Channel Digital Input
Modbus RTU TCP Protocol
PoE Power Supply
Web Browser Config
This 8-CH Ethernet Relay Module (B) stands out with integrated digital input capabilities alongside relay outputs. It supports Modbus RTU TCP protocols and offers PoE power for simplified wiring. The high rating reflects its robust design and successful integration in various projects.
Pros
- Dual input output control
- High user satisfaction
- Web browser configuration
- Multi communication modes
Cons
- Configuration might be complex
- Requires network knowledge
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Users can configure the device via web browser or software tools to manage settings easily. It accepts both passive dry contact and active wet contact inputs for flexibility. Multiple communication modes including HTTP MQTT provide versatile networking options.
The digital inputs allow for feedback mechanisms like sensor detection which enhances automation logic. Bi-directional optocoupler isolation ensures signals remain clean and safe from voltage spikes. This makes it highly versatile for smart home or light industrial monitoring.
Ideal for users needing both control and monitoring over Ethernet, this module excels in feedback applications. The high satisfaction rate suggests ease of use despite technical capabilities. We recommend it for projects requiring status confirmation alongside device control.
Versatile Input Handling
Support for both dry and wet contact inputs allows connection to a wide range of sensors and switches.
Multiple Communication Protocols
Support for TCP UDP HTTP and MQTT enables seamless integration into various IoT and industrial network architectures.
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7. Industrial 8-Ch ESP32-S3 WiFi Relay Module RS485 – Versatile Ethernet Relay Module
Industrial 8-Ch ESP32-S3 WiFi Relay Module RS485
ESP32-S3 Processor
RS485 and Ethernet Ports
WiFi and Bluetooth Support
10A Contact Rating
This Industrial 8-Ch ESP32-S3 WiFi Relay Module combines wired Ethernet with RS485 for broad connectivity. It features an ESP32-S3 microcontroller with dual-core performance for efficient task handling. The inclusion of digital inputs adds significant utility for monitoring applications.
Pros
- Strong processor performance
- Multiple connectivity options
- Arduino IDE support
- Isolated protection circuits
Cons
- May need external power supply
- Software setup required
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Optocoupler isolation and power isolation circuits ensure safe operation in mixed voltage environments. It supports passive and active digital inputs with bi-directional isolation for reliable sensor interfacing. Comprehensive SDK resources and technical support ease development challenges.
While the hardware is robust, the initial setup may require attention to network and protocol configurations. The 10A contact rating allows for direct control of standard household appliances safely. It is best suited for custom projects needing high processing power.
For users comfortable with Arduino IDE and network programming, this module offers a powerful foundation. The support resources help bridge gaps in configuration complexity. We recommend it for advanced automation needing both legacy and modern network interfaces.
Extensive Development Support
Comprehensive SDK online development resources, and tutorials make it easier for developers to implement custom control logic.
Reliable Sensor Integration
Bi-directional optocoupler isolation on digital inputs ensures safe connection to external sensors without risking the main board.
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8. Waveshare 30-Ch Ethernet Relay Module – High Channel Ethernet Relay Module
Waveshare 30-Ch Ethernet Relay Module
30 Channel Relay Output
Modbus RTU TCP Protocol
PoE Power Support
Dedicated Relay Driver
The Waveshare 30-Ch Ethernet Relay Module provides extensive control capacity for large-scale automation. It supports Modbus RTU TCP protocols and PoE power for streamlined deployment. Dedicated relay driver chips ensure stronger and more stable driving capability for high loads.
Pros
- High channel count capacity
- Stable dedicated driver chip
- PoE power convenience
- Industrial safety features
Cons
- Larger physical footprint
- Higher cost than basic units
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Features like flash-on and flash-off allow precise timing control for each channel without external logic. Optocoupler isolation prevents high-voltage interference from damaging the board. This unit is ideal for complex installations requiring many switching points.
While powerful, the 30-channel design increases the physical size and power requirements compared to smaller modules. It remains suitable for industrial environments where density and reliability are paramount. The rail-mount case facilitates secure installation in control cabinets.
For applications like smart agriculture or large breeding facilities, this module offers the necessary scale. We recommend checking power requirements carefully before installation. It is a solid choice for projects needing centralized control over many devices.
High-Density Control
Thirty relay channels allow management of extensive systems from a single networked unit, reducing hardware sprawl.
Robust Driver Technology
A dedicated relay driver chip with flyback diode protection ensures consistent performance and protects against inductive spikes.
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9. Waveshare 8-Ch Ethernet Relay Module (B) with Digital Input – Integrated Ethernet Relay Module
Waveshare 8-Ch Ethernet Relay Module (B) with Digital Input
Digital Input Linkage
Flash On Off Function
Flyback Diode Protection
Rail-Mount ABS Case
This Waveshare 8-Ch Ethernet Relay Module (B) supports advanced linkage control for digital inputs. It features a dedicated debouncing algorithm to ensure clean signal processing. Optocoupler isolation and reverse-proof circuits provide strong protection for the internal electronics.
Pros
- Linkage control support
- Toggle control options
- De-bouncing algorithm
- Strong protection circuits
Cons
- Configuration needs attention
- Price higher than standard
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The module allows relay support for digital input linkage control which is useful for automation triggers. Network indicators help visualize signal receiving status during operation. PoE power support reduces cabling complexity for remote installations.
While the features are robust, users should be prepared for detailed setup to utilize linkage control effectively. The relay rating of 10A is standard for general industrial switching tasks. It is best suited for applications needing input-based triggering logic.
Buyers looking for smart triggering capabilities without complex PLC setups will find this useful. The industrial case design ensures durability in various environments. We recommend reviewing the specific linkage configuration guide before deployment.
Automated Trigger Control
Linkage control allows relays to switch automatically based on digital input states, simplifying local automation logic.
Signal Stability Features
An onboard debouncing algorithm filters out noisy signals ensuring reliable input recognition and stable relay behavior.
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10. 8-CH Ethernet Relay Module Modbus RTU TCP PoE – Industrial Ethernet Relay Module
8-CH Ethernet Relay Module Modbus RTU TCP PoE
8 Channel Relay Control
Modbus Protocol Support
PoE Power Supply
Web Browser Config
This 8-CH Ethernet Relay Module offers standard industrial control with Modbus RTU TCP support. It supports PoE power supply and comes with an industrial grade rail-mount case. Configuration via web browser simplifies network setup for users without deep programming skills.
Pros
- Modbus integration ready
- PoE compatibility
- Web configuration available
- Standard industrial features
Cons
- Basic feature set
- Limited documentation
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Features include flash-on and flash-off functions for timed operations. Optocoupler isolation prevents interference from high-voltage circuits ensuring reliability. The contact rating allows for control of standard devices up to 10A safely.
While it lacks the advanced wireless features of newer models, it remains a solid choice for wired networks. The DHCP support helps in dynamic IP environments without manual assignment. It is a reliable unit for basic industrial automation needs.
For users prioritizing stability and protocol standard over advanced connectivity, this module is effective. We suggest verifying network compatibility with your existing infrastructure. It offers a good balance of features for cost-conscious industrial buyers.
Simple Network Configuration
DHCP and DNS support allow for dynamic IP assignment which streamlines setup in networks without static addressing.
Timed Operation Support
Built-in flash functions enable relay timing without external timers reducing system complexity and hardware costs.
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Buying Guide – How to Choose the Best Ethernet Relay Module
Selecting the right Ethernet Relay Module involves evaluating several critical factors to ensure compatibility and performance. This guide breaks down the essential aspects to consider before making your final decision.
Communication Protocols
Ethernet Relay Modules typically use protocols like Modbus TCP, HTTP, or MQTT. Choose a module that supports your existing network infrastructure or controller software. If you work with industrial PLCs, Modbus support is often essential.
Ensure the protocol matches your system requirements to avoid compatibility issues during integration.
Power Supply Options
Some modules support Power over Ethernet (PoE) which simplifies wiring by delivering both data and power through a single cable. Others require separate DC inputs ranging from 7V to 36V. Evaluate your power availability and installation constraints.
PoE support is highly recommended for remote installations to reduce cabling complexity and costs.
Isolation and Protection
Optocoupler isolation protects the internal circuitry from high-voltage interference which is vital for safety. Look for features like reverse-proof circuits and flyback diode protection to prevent damage from incorrect wiring or spikes.
Robust isolation ensures long-term reliability and protects your other equipment from potential electrical faults.
Channel Count and Type
Modules come with varying numbers of relay channels, such as 2, 8, or 30. Decide based on how many devices you need to control. Some also include digital inputs for monitoring sensors or switches alongside the relays.
Selecting the right channel count prevents under- or over-engineering your solution.
Wireless Connectivity
Advanced models include WiFi and Bluetooth alongside Ethernet for flexible connectivity. This is useful if you need to control devices remotely without physical cables. Ensure the wireless range and standards match your environment.
Wireless options add versatility but may require additional security considerations for your network.
Configuration Ease
Look for modules that offer web-based configuration or intuitive software tools. This simplifies setting IP addresses and network parameters. Some high-end models support dynamic IP via DHCP which reduces manual setup steps.
Easy configuration saves time and reduces the risk of setup errors during installation.
Environmental Robustness
Industrial units often come with rail-mount cases designed to withstand vibration and temperature changes. Check the enclosure material and temperature ratings if installing in harsh environments. Dust and moisture resistance may also be necessary.
Rugged build quality ensures the device operates reliably even in demanding factory or outdoor conditions.
Development and Support
Check if the manufacturer provides documentation SDKs or technical support. This is especially important if you plan to customize the functionality. Active community support can also help troubleshoot issues quickly.
Strong developer resources ensure you can fully utilize the module's capabilities without unnecessary hurdles.
How to Use and Care for Your Ethernet Relay Module
First, connect the module to your network using an Ethernet cable and configure the IP address via the provided web interface or software. Ensure your computer is on the same subnet to access the settings page for network configuration.
Second, wire the load to the relay terminals according to the manual, observing voltage and current limits. Connect the power supply ensuring positive and negative terminals are correctly matched to prevent reverse polarity damage.
Third, regularly check the status LEDs to monitor network connection and relay activity. Keep the device in a clean, dry environment and avoid dust accumulation on the ventilation or connection ports to maintain optimal performance.
Frequently Asked Questions
What is the difference between Modbus TCP and Modbus RTU?
Modbus TCP is used over Ethernet networks allowing devices to communicate using standard IP packets. Modbus RTU is typically used over serial connections like RS485. Many industrial modules support both for flexibility depending on your network setup.
Can I use an Ethernet Relay Module with a smartphone?
Yes, if the module supports HTTP or a dedicated app protocol you can control it via a smartphone browser. Some models with WiFi also allow direct connection without a router for mobile control within range.
Is PoE power necessary for installation?
PoE simplifies installation by removing the need for a separate power source near the device. It is not strictly necessary if you have access to a 7-36V DC power supply but is highly beneficial for clean setups.
What voltage range can these modules support?
Most industrial modules support a wide range like 7V to 36V DC allowing flexibility with different power supplies. Always check the specific model documentation to ensure your power source is within the safe limits.
Are digital inputs useful for home automation?
Yes, digital inputs can connect to sensors like door switches or motion detectors to trigger relays automatically. This allows for smart scenarios without needing external controllers which enhances automation capability.
How do I protect the module from electrical interference?
Modules with optocoupler isolation offer built-in protection. Additionally, use shielded cables and ensure proper grounding to minimize noise. Keeping high-voltage wires separate from signal wires also reduces interference risks.
Final Thoughts on Choosing the Best Ethernet Relay Module
We highlighted ten top Ethernet Relay Modules that cover various needs from basic control to advanced industrial automation. Our top picks include options with WiFi integration, high channel counts, and robust protection features for diverse applications.
Prioritize factors like communication protocols, power options, and isolation when selecting a module. Matching these features to your specific project requirements ensures a stable and efficient installation without unnecessary complexity.
Remember that availability and details can change so always verify current specifications and pricing before purchasing. This guide aims to simplify your selection process for finding the right Ethernet control solution.