Pinhaijing LAN Ethernet 2 Way Relay Board
4.8Editor score
Web server interface
STC microcontroller
Compact PCB design
In this guide
Ethernet relay modules are essential components for modern industrial automation and smart home control systems. They allow you to manage electrical devices remotely via network connections ensuring precise and efficient operation across various environments.
We evaluated ten leading products based on their communication protocols power options and industrial grade construction. Each item was assessed for reliability ease of integration and overall performance in real world control applications.
Every selection highlights key strengths and unique capabilities to help you choose the right solution. Keep in mind that product availability and specific configurations may change so verify details before purchasing.
Top 3 Picks for Best Ethernet Relay Module
Industrial 8-Ch ESP32-S3 WiFi Relay Module
4.8Editor score
Built in PoE module
Dual mode wireless control
Optocoupler isolation
Waveshare 30-Ch Ethernet Relay Module
4.2Editor score
Thirty channel capacity
Modbus RTU TCP support
Industrial rail mount case
Top 10 Best Ethernet Relay Module in 2026 Compared
The following table provides a side by side overview of the leading Ethernet relay modules available this month. Each entry highlights critical specifications to help you quickly identify the most suitable model for your specific project requirements and control needs.
ProductsSpecificationsEditor scorePrice
Best Budget
8-CH Ethernet Relay Module
8 Channel Relay
Modbus RTU TCP
PoE Power Supply
3.4Editor score
Editor's Choice
Waveshare 8-Ch Ethernet Relay Module
8 Channel Relay
Optocoupler Isolation
Industrial Rail Mount
4.1Editor score
Editor's Choice
Industrial 8-Ch ESP32-S3 WiFi Relay Module
ESP32-S3 Core
WiFi Bluetooth LE
PoE Ethernet Port
4.8Editor score
8-CH Ethernet Relay Module (B)
8 Digital Input
Modbus Protocol
DHCP DNS Support
4.9Editor score
Industrial 8-Ch ESP32-S3 WiFi Relay Module
Dual Core Processor
RS485 Interface
Optocoupler Protection
4.6Editor score
Waveshare 30-Ch Ethernet Relay Module
30 Channel Relay
Flash Function
Industrial Grade Case
4.2Editor score
Waveshare Industrial 8-Channel ESP32-S3
Isolated RS485
Type-C USB
RTC Chip
4.7Editor score
Waveshare 8-Ch Ethernet Relay Module (B)
Flyback Diode
Debouncing Algorithm
Network Indicators
4.2Editor score
Pinhaijing LAN Ethernet 2 Way Relay Board
2 Channel Relay
STC Microcontroller
FR-4 PCB
4.8Editor score
8-CH Ethernet Relay Module
HTTP MQTT Support
Wide Power Range
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 Processor
PoE Ethernet Port
Optocoupler Isolation
RS485 Interface
This industrial module features an ESP32-S3 microcontroller with robust connectivity and safety protections. Its high rating reflects strong reliability in professional control environments requiring wireless and wired options.
Pros
- Dual mode wireless connectivity
- Built in PoE module
- High performance dual core
- Strong isolation protection
Cons
- Price point higher
- Requires network setup
We may earn a commission when you buy through this link, at no additional cost to you.
The onboard RS485 and digital input interfaces allow seamless integration into existing industrial systems. PoE support simplifies cabling while optocoupler isolation ensures safe operation when controlling high voltage circuits.
While the cost is higher than basic units the dual mode wireless and processing power justify the investment for complex setups. Users should consider network availability before deployment.
It suits engineers and installers needing a versatile reliable relay solution with modern communication features. The balance of performance and protection makes it a top choice for automation projects.
Flexible Remote Connectivity
Integrated Wi-Fi and Bluetooth LE enable wireless control from smartphones or remote servers without extra hardware.
Industrial Grade Safety
Multiple isolation circuits prevent electrical interference and protect sensitive control logic from high voltage surges.
We may earn a commission when you buy through this link, at no additional cost to you.
2. Waveshare 8-Ch Ethernet Relay Module – Reliable Industrial Protocol Support
Waveshare 8-Ch Ethernet Relay Module
Modbus RTU TCP
PoE Communication
Rail Mount Case
LED Indicators
This module offers a solid foundation for Modbus based industrial control systems with straightforward connectivity. Its rail mount case fits standard DIN rails making installation quick and secure for facility managers.
Pros
- Modbus protocol support
- Standard rail mount design
- Clear status indicators
- PoE power capability
Cons
- Rating slightly lower
- Limited to 8 channels
We may earn a commission when you buy through this link, at no additional cost to you.
The support for both RTU and TCP protocols ensures compatibility across legacy and modern networks. Network indicators help technicians quickly diagnose signal issues during setup or troubleshooting tasks.
Some users report minor variability in connection stability compared to higher rated models. However the core functionality remains robust for standard switching tasks in controlled environments.
Ideal for maintenance teams prioritizing protocol compatibility and ease of mounting. It delivers consistent performance for routine automation where wireless features are not required.
Protocol Versatility
Dual Modbus support allows connection to both serial and Ethernet based master devices seamlessly.
Secure Installation
Industrial grade ABS case protects internal components from dust and accidental physical contact.
We may earn a commission when you buy through this link, at no additional cost to you.
3. 8-CH Ethernet Relay Module – Solid Modbus RTU TCP Base
8-CH Ethernet Relay Module
Modbus RTU TCP
PoE Power Supply
ABS Rail Case
Flash On Off
A basic industrial relay module designed for simple automation tasks requiring network control. It supports standard Modbus protocols which makes it easy to integrate into existing PLC systems.
Pros
- Affordable entry option
- PoE power support
- Flash control feature
- Compact design
Cons
- Lower reliability rating
- Basic feature set
We may earn a commission when you buy through this link, at no additional cost to you.
The PoE power supply reduces wiring complexity by combining data and power in one cable. Users can set temporary activation periods with the flash-on flash-off command for testing or alerts.
Customer feedback suggests occasional configuration challenges and slower response times than advanced units. It may require more patience during initial setup compared to higher rated models.
Best suited for hobbyists or small scale projects with limited budgets. It provides essential Ethernet control functions without the complexity of wireless or advanced digital inputs.
Power Efficiency
PoE compliance means you can power the module directly through the network switch or injector.
Timed Activation
Flash commands allow temporary relay activation for brief events like testing or signaling.
We may earn a commission when you buy through this link, at no additional cost to you.
4. Industrial 8-Ch ESP32-S3 WiFi Relay Module – Versatile Dual Communication
Industrial 8-Ch ESP32-S3 WiFi Relay Module
ESP32-S3 Core
RS485 Interface
Dual Wireless
Digital Input
This unit delivers high performance control with robust wireless and wired connectivity options. The ESP32-S3 platform provides ample processing power for complex automation logic or custom firmware development needs.
Pros
- Strong dual core processor
- Extensive development support
- Multiple interface options
- Safe isolation design
Cons
- Complex for beginners
- Requires technical setup
We may earn a commission when you buy through this link, at no additional cost to you.
Users benefit from comprehensive SDK and online resources that simplify programming. Digital inputs and RS485 expand the range of sensors and devices the module can interface with effectively.
The feature set is advanced which might overwhelm those new to industrial networking or coding. Proper documentation review is recommended to unlock its full potential and stability.
Recommended for developers and system integrators needing flexible high speed control. The balance of wireless and industrial protocols supports a wide range of smart automation applications.
Developer Friendly
Comprehensive SDK and tutorials enable rapid prototyping and custom firmware implementation.
Sensor Integration
Passive and active digital inputs support a variety of industrial sensors and switches.
We may earn a commission when you buy through this link, at no additional cost to you.
5. 8-CH Ethernet Relay Module (B) – Advanced Network Features
8-CH Ethernet Relay Module (B)
Modbus RTU TCP
Dynamic IP via DHCP
HTTP MQTT Support
Optocoupler Isolation
This module stands out with an exceptional rating reflecting its reliability and robust feature set. It offers both web and software configuration options for easy integration into diverse network environments.
Pros
- Top rating for quality
- Web browser config
- DHCP DNS support
- Strong protection circuits
Cons
- Configuration requires network
- Higher cost factor
We may earn a commission when you buy through this link, at no additional cost to you.
Support for DHCP and DNS allows the unit to join networks without static IP assignments. The inclusion of HTTP and MQTT protocols enables direct integration with modern cloud services and dashboards.
Installation may require some network knowledge to configure the IP and protocol settings correctly. However the flexibility it provides for remote management is substantial for professional setups.
An excellent choice for system admins prioritizing security and network adaptability. Its high rating suggests it performs consistently well in demanding industrial control scenarios.
Easy Configuration
Web browser access simplifies initial setup without needing specialized software tools.
Cloud Ready
MQTT and HTTP support allow seamless connection to IoT platforms for monitoring.
We may earn a commission when you buy through this link, at no additional cost to you.
6. Waveshare 30-Ch Ethernet Relay Module – Maximum Channel Capacity
Waveshare 30-Ch Ethernet Relay Module
30 Channels
PoE Power Supply
Modbus Protocol
Relay Driver Chip
For large scale automation projects this module offers thirty relay channels in a single industrial housing. The dedicated driver chip ensures stable performance even when controlling multiple circuits simultaneously.
Pros
- High channel count
- Stable relay driver
- Industrial rail mount
- PoE capability
Cons
- Larger physical size
- Higher price point
We may earn a commission when you buy through this link, at no additional cost to you.
PoE support simplifies power delivery for this high channel count unit. Modbus protocols enable centralized management through SCADA or PLC systems for coordinated control of many devices.
The unit is physically larger and costs more than eight channel models. However the consolidation reduces wiring complexity and saves space in crowded control panels.
Perfect for farms or factories needing extensive control points without multiple modules. Its design prioritizes reliability and scale for complex operational environments.
Large Scale Control
Thirty relays allow control of extensive lighting or machinery arrays in one device.
Stable Performance
Dedicated driver chips with flyback protection maintain stable operation under load.
We may earn a commission when you buy through this link, at no additional cost to you.
7. Waveshare Industrial 8-Channel ESP32-S3 – High Performance Processing
Waveshare Industrial 8-Channel ESP32-S3
240MHz Processor
Isolated RS485
PoE Ethernet
USB Type-C
This variant features a powerful processor for rapid response and complex logic execution. The isolated RS485 interface ensures secure communication with industrial sensors and master controllers.
Pros
- Fast dual core speed
- Isolated serial port
- USB for firmware
- PoE capability
Cons
- Technical setup required
- Power via USB limited
We may earn a commission when you buy through this link, at no additional cost to you.
USB Type-C support simplifies firmware updates and debugging for developers. PoE capability adds flexibility for power delivery in industrial installations with existing network cabling.
Advanced capabilities require technical knowledge to exploit fully. Users comfortable with microcontrollers will appreciate the speed and isolation features available on board.
Ideal for engineering projects needing fast processing and secure serial connections. The hardware supports demanding real time control applications in smart facilities.
Fast Processing
240MHz dual core enables quick reaction to sensor inputs and network commands.
Debugging Support
USB Type-C port provides easy access for firmware updates and diagnostics.
We may earn a commission when you buy through this link, at no additional cost to you.
8. Waveshare 8-Ch Ethernet Relay Module (B) – Robust Protection Design
Waveshare 8-Ch Ethernet Relay Module (B)
Flyback Diode
Debouncing Algorithm
Digital Linkage
Network Indicators
This module includes specialized protection circuits like flyback diodes to extend relay lifespan. The debouncing algorithm ensures clean digital input signals without noise interference for stable automation.
Pros
- Strong circuit protection
- Debounced inputs
- Network status LEDs
- Rail mount case
Cons
- Complex feature set
- Higher installation skill
We may earn a commission when you buy through this link, at no additional cost to you.
Users can link relay outputs to digital inputs for automated safety checks without software. Network indicators make it easy to verify connection status during maintenance or troubleshooting.
While the features add value they increase the configuration complexity. Technicians should read documentation carefully to utilize the linkage and protection settings effectively.
A great option for industrial settings prioritizing hardware durability and signal stability. Its design minimizes risk of false triggers in noisy electrical environments.
Signal Integrity
Debouncing filters prevent false signals from mechanical switches or noisy lines.
Relay Protection
Flyback diodes absorb voltage spikes to protect the driving electronics.
We may earn a commission when you buy through this link, at no additional cost to you.
9. Pinhaijing LAN Ethernet 2 Way Relay Board – Affordable Simple Control
Pinhaijing LAN Ethernet 2 Way Relay Board
TCP/UDP Control
Web Server Access
Compact PCB
STC Controller
An affordable solution for small scale remote control needs without advanced networking requirements. It features a built-in web server allowing direct control through any standard browser.
Pros
- Low cost option
- Direct web control
- Compact size
- Secure password
Cons
- Only 2 channels
- Basic firmware
We may earn a commission when you buy through this link, at no additional cost to you.
The compact PCB design fits easily into tight enclosures or DIY projects. Password protection adds a basic layer of security to prevent unauthorized access to relay controls.
It lacks industrial features like rail mounting or PoE power which limits professional use. However for home automation it offers excellent value for money.
Ideal for hobbyists or small offices needing simple networked switching. Its ease of use and low price make it accessible for entry level projects.
Browser Control
No extra client software needed as controls are accessible via standard web browsers.
Compact Footprint
Small PCB size allows installation in tight or limited enclosure spaces.
We may earn a commission when you buy through this link, at no additional cost to you.
10. 8-CH Ethernet Relay Module – Practical Industrial Solution
8-CH Ethernet Relay Module
Modbus Protocol
PoE Compliant
Wide Power Input
Optocoupler Isolation
This model offers a balanced set of features suitable for standard industrial switching tasks. Its wide power input range supports various power sources from direct current adapters to PoE.
Pros
- Standard rail mount
- Modbus flexibility
- Wide power range
- PoE support
Cons
- Average features
- Basic connectivity
We may earn a commission when you buy through this link, at no additional cost to you.
Modbus RTU and TCP protocols ensure it can connect to most existing automation networks. Optocoupler isolation protects control signals from electrical interference on the field side.
While it does not stand out with advanced capabilities it delivers reliable core functionality. It is a solid choice for basic automation requirements without extra complexity.
Recommended for facilities needing straightforward relay access with proven protocol support. Its design focuses on dependable operation in routine monitoring and control tasks.
Power Flexibility
Accepts power from direct adapters or PoE for flexible deployment options.
Standard Compatibility
Modbus support ensures easy integration into existing industrial control networks.
We may earn a commission when you buy through this link, at no additional cost to you.
Buying Guide – How to Choose the Best Ethernet Relay Module
Selecting the right Ethernet relay module depends on understanding your system requirements and constraints. This guide outlines the critical factors to consider before making a purchase.
Channel Count Requirements
Determine how many devices you need to control simultaneously. Eight channel modules are common for small setups but larger projects may require thirty or more channels to avoid multiple units.
Match the relay count to your load to save space and reduce wiring complexity.
Communication Protocols
Check your network and controller compatibility. Many industrial systems rely on Modbus RTU or TCP so ensure the module supports these protocols for seamless integration.
Select a module with the specific protocol your SCADA or PLC system uses.
Power Supply Options
Ethernet modules often support standard DC inputs or PoE. PoE simplifies cabling by providing power and data over one network cable which reduces installation costs.
Choose PoE if you have network switches compatible with IEEE 802.3af standards.
Isolation and Protection
Optocoupler isolation protects control logic from high voltage spikes on the relay side. Flyback diodes protect internal circuits from voltage spikes caused by inductive loads.
Look for robust isolation features to ensure long term stability and safety.
Mounting and Enclosure
Industrial modules usually come with rail mount ABS cases for secure DIN rail installation. This design protects components from dust and physical damage in factory settings.
Prioritize modules with sturdy rail mount cases for professional environments.
Digital Input Support
Some units include digital inputs for linking sensors directly to relay actions. Passive or active input support allows connection to switches or sensors without extra logic.
Select models with inputs if you need automated safety checks or triggers.
Wireless Capabilities
Advanced modules offer Wi-Fi or Bluetooth in addition to Ethernet. This allows for remote control without additional cabling or complex network infrastructure.
Consider wireless options if physical network lines are hard to install.
Configuration Methods
Configuration can be handled via software web browser or mobile app. Easy configuration reduces setup time and simplifies future adjustments for technicians.
Pick units with web browser interfaces for quick and tool-free setup.
How to Use and Care for Your Ethernet Relay Module
Begin by connecting the module to your network using an Ethernet cable and ensuring power is supplied via DC or PoE. Use the provided software or web interface to assign an IP address based on DHCP or static settings.
Configure relay channels through the interface by naming them and setting input triggers. Test each relay manually to confirm it activates properly before integrating with external systems or sensors.
Regularly update firmware if available to maintain security and performance. Inspect terminals and connections annually to ensure they remain secure and free of corrosion or dust.
Frequently Asked Questions
Can these modules work with PLC systems?
Yes most models support standard Modbus RTU or TCP protocols which are widely used in PLC automation. Check the manual for specific command sets before integration to ensure full compatibility.
What is the maximum load per relay channel?
Most industrial modules handle up to 10A at 250VAC or 30VDC per channel. Always verify the contact rating in the product data to avoid overloading and ensure safety.
Do I need special software to control these?
Many modules allow control via web browsers or standard Modbus tools. Some offer SDKs for custom apps but basic operations can be done through included interfaces.
Is PoE support common on these modules?
PoE is available on many industrial models simplifying power delivery. Verify compliance with IEEE 802.3af on the specific unit to ensure it works with your switch.
Are these modules suitable for home automation?
They are powerful enough for home use but often more technical than consumer smart plugs. Hobbyists and smart home enthusiasts find them useful for custom wired projects.
How do I secure the module from unauthorized access?
Use password protection in the web interface and network VLANs to isolate devices. Regular firmware updates also help patch potential security vulnerabilities.
Final Thoughts on Choosing the Best Ethernet Relay Module
This guide has covered ten leading options ranging from simple budget boards to advanced industrial units. The top picks balance performance features and reliability to suit different project needs.
When deciding prioritize channel count protocol support and power options that fit your existing infrastructure. Safety features like isolation are critical for industrial environments.
Verify availability and configurations before finalizing your choice since models can update. Consult the product links for the latest specifications and support details.