Pinhaijing LAN Ethernet 2 Way Relay
4.8Editor score
TCP UDP Controller
Web Server Interface
Low Power Input
In this guide
Ethernet Relay Modules are essential components for modern industrial automation and smart home systems. They allow remote control of electrical devices through network connections, enabling seamless integration with existing infrastructure and centralized management tools.
We compared ten leading models based on protocol support, power flexibility, isolation quality, and build durability. Our analysis focuses on real-world usability, compatibility with common industrial standards, and the reliability of long-term operations in demanding environments.
Each pick highlights key strengths and ideal use cases to help you find the right fit. Please note that pricing and availability can change frequently, so verify current details before making your final purchasing decision.
Top 3 Picks for Best Ethernet Relay Module
Industrial 8-Ch Ethernet Relay Module (B)
4.9Editor score
Modbus RTU TCP Protocol
PoE Power Supply
Digital Input Support
Industrial 8-Ch ESP32-S3 WiFi Relay
4.8Editor score
WiFi Bluetooth Control
RS485 Interface
Dual Core Processor
Top 10 Best Ethernet Relay Module in 2026 Compared
The following table provides a side-by-side comparison of the top ten Ethernet Relay Modules, highlighting their core specifications, connectivity options, and key differentiators to assist your selection process.
ProductsSpecificationsEditor scorePrice
Best Budget
8-CH Ethernet Relay Module
Modbus RTU TCP
PoE Power
8 Channel Relay
Rail Mount Case
3.4Editor score
Editor's Choice
Waveshare 8-Ch Ethernet Relay
Modbus RTU TCP
PoE Port
Optocoupler Isolation
Industrial Grade Case
4.1Editor score
Best Premium
Industrial 8-Ch ESP32-S3 WiFi
WiFi Bluetooth LE
RS485 Port
Digital Input
PoE Power
4.8Editor score
8-CH Ethernet Relay Module (B)
Modbus TCP Protocol
Digital Input
Web Config
PoE Compliant
4.9Editor score
Industrial 8-Ch ESP32-S3 Module
ESP32-S3 Controller
RS485 Ethernet
Arduino IDE
Optocoupler Isolation
4.6Editor score
Waveshare 30-Ch Ethernet Relay
30 Channel Relay
Modbus TCP
MQTT Support
Industrial Case
4.2Editor score
Waveshare Industrial ESP32-S3
Xtensa 32-bit
Isolated RS485
PoE Port
USB Type-C
4.7Editor score
Waveshare 8-Ch Relay (B)
Flash On Off
Digital Linkage
Debounce Algorithm
Rail Mounted
4.2Editor score
Pinhaijing LAN Ethernet Relay
2 Way Relay
TCP UDP
Web Server
STC Microcontroller
4.8Editor score
8-CH Ethernet Relay Module
Modbus Protocol
PoE Supply
Web Browser Config
Isolation Circuits
4.0Editor score
1. Industrial 8-Ch Ethernet Relay Module (B) – Best Overall Ethernet Relay Module
Industrial 8-Ch Ethernet Relay Module (B)
Modbus TCP RTU
Digital Input Support
PoE Power Option
Web Browser Config
This industrial Ethernet Relay Module stands out with an impressive rating and comprehensive feature set. It combines robust Modbus support with digital input capabilities, making it versatile for complex automation tasks.
Pros
- High reliability rating
- Multiple protocols supported
- PoE power flexibility
- Strong isolation circuits
- Easy web configuration
Cons
- Price slightly higher
- Limited to 8 channels
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Its support for both Modbus RTU and TCP protocols ensures broad compatibility across different industrial systems. The inclusion of PoE power supply simplifies installation by reducing the need for separate power wiring.
While the price is somewhat higher than basic models, the added reliability and configuration options justify the cost. The digital input with optocoupler isolation provides essential safety for interacting with external sensors.
Ideal for facility managers and integrators seeking a dependable solution for remote device control. Its web browser configuration makes it accessible without specialized software tools.
Versatile Protocol Support
Supports TCP Server, Client, UDP, and Modbus protocols for seamless integration with various SCADA systems.
Flexible Power Options
Offers DC 7 to 36V input and PoE compliance, allowing installation in remote or hard-to-reach locations.
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2. 8-CH Ethernet Relay Module – Reliable Industrial Control
8-CH Ethernet Relay Module
Modbus RTU TCP
PoE Power
Flash On Off
ABS Rail Case
This module provides essential industrial relay control features at a competitive level. It is designed for straightforward applications requiring reliable switching through Ethernet networks.
Pros
- Standard Modbus support
- PoE capability
- Rail mount design
- Simple operation
- Wide voltage input
Cons
- Lower rating score
- Basic feature set
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The flash-on and flash-off functions allow for temporary relay activation, useful for testing or signaling purposes. The onboard optocoupler isolation protects sensitive electronics from high-voltage interference.
The lower rating suggests potential limitations in support or specific implementation quirks that users should consider. It remains a viable option for simpler setups where advanced features are not critical.
Suitable for small workshops or legacy system upgrades where basic Modbus TCP connectivity is required. Ensure firmware updates are available before committing to long-term deployment.
Temporary Activation Features
Flash functions enable automated pulse control without continuous manual intervention.
Protection Circuits
Reverse-proof circuits and isolation safeguard against incorrect connections and voltage spikes.
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3. Waveshare 8-Ch Ethernet Relay – Strong Protection Features
Waveshare 8-Ch Ethernet Relay
Industrial Case
Network LEDs
Optocoupler Isolation
MQTT Support
Waveshare delivers a robust solution focused on hardware durability and network visibility. The rail-mount case and clear LED indicators simplify physical installation and status monitoring.
Pros
- Industrial grade build
- Visual network indicators
- Strong isolation
- PoE support
- MQTT integration
Cons
- Mid-range rating
- No digital input
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Built-in isolation circuits prevent interference from high-voltage lines, ensuring safe operation in noisy industrial environments. MQTT support allows for easy integration into modern IoT cloud platforms.
The lack of digital inputs limits its ability to read sensor states directly without external modules. However, its stability and build quality make it a solid choice for pure output control.
Recommended for applications prioritizing physical protection and reliable Ethernet connectivity. It is an excellent fit for automated lighting or pump control systems.
Visual Status Monitoring
Four LEDs clearly indicate MCU and network signal status at a glance.
Cloud Integration
Alibaba Cloud MQTT demo helps quickly set up remote monitoring capabilities.
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4. Industrial 8-Ch ESP32-S3 WiFi Relay – Best for Wireless Flexibility
Industrial 8-Ch ESP32-S3 WiFi Relay
ESP32-S3 Core
WiFi Bluetooth LE
Digital Input
RS485 Port
This module combines wired Ethernet with advanced wireless capabilities through a powerful ESP32-S3 processor. It supports both Wi-Fi and Bluetooth for flexible remote control without requiring physical cables.
Pros
- Dual wireless options
- Powerful processor
- PoE power
- RS485 interface
- High reliability
Cons
- Higher complexity
- Premium price point
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The onboard RS485 port allows connection to legacy Modbus devices, creating a bridge between old and new systems. Digital inputs with optocoupler isolation enable direct interaction with switches and sensors.
While more complex to configure than basic Ethernet modules, the versatility is unmatched. Developers can leverage the Arduino IDE for custom logic and integrations.
Best for advanced users needing a unified control point for both wired and wireless networks. Its PoE capability ensures power delivery over the same cable used for networking.
Dual Core Processing
240MHz dual-core processor handles complex logic tasks efficiently.
Legacy System Bridge
RS485 port connects to industrial sensors or displays without extra hardware.
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5. Industrial 8-Ch ESP32-S3 Module – Developer Friendly Option
Industrial 8-Ch ESP32-S3 Module
ESP32-S3 Micro
Ethernet RS485
SDK Resources
Optocoupler Isolation
Designed with developers in mind, this module offers extensive resources for custom programming and integration. The SDK and tutorial support make it easier to implement specific project requirements.
Pros
- Comprehensive SDK
- Online tutorials
- Strong isolation
- Ethernet connectivity
- Bluetooth support
Cons
- Requires coding knowledge
- No PoE on this model
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It maintains robust isolation standards while providing both Ethernet and wireless connectivity. The combination of RS485 and digital inputs adds significant flexibility for industrial use cases.
Lack of PoE means separate power wiring is necessary, which might complicate installation in some setups. However, the power input range is wide enough to accommodate common supplies.
Ideal for prototyping or custom industrial applications requiring bespoke logic. The detailed documentation helps reduce the time needed for initial setup and debugging.
Developer Resources
Online SDK and technical support facilitate rapid development cycles.
Connectivity Mix
Ethernet provides stability while Bluetooth offers quick local access.
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6. Waveshare 30-Ch Ethernet Relay – High Channel Capacity
Waveshare 30-Ch Ethernet Relay
30 Channels
Modbus TCP
Flyback Diode
Industrial Case
For large-scale projects, this model offers thirty channels of relay control in a single unit. It is designed to handle significant control loads in centralized industrial environments.
Pros
- High channel count
- Dedicated driver chip
- PoE support
- Strong protection
- Versatile application
Cons
- Larger footprint
- Higher cost
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The dedicated relay driver chip with flyback diode protection ensures stable driving capability for all channels simultaneously. PoE support simplifies wiring when power sources are distant.
Its physical size and cost reflect the high channel density, so it is best suited for installations where space efficiency is a priority. The protection circuits ensure durability under heavy use.
Perfect for building automation or large farms where many devices need centralized switching. It consolidates multiple smaller modules into one manageable unit.
High Density Control
Thirty relays allow for controlling numerous circuits from one network node.
Stable Driving
Dedicated driver chips ensure consistent performance across all channels.
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7. Waveshare Industrial ESP32-S3 – Performance Focused Design
Waveshare Industrial ESP32-S3
Xtensa Processor
Isolated RS485
PoE Port
Type-C Debug
This module emphasizes high processing performance and industrial-grade connectivity features. The Xtensa dual-core processor ensures smooth handling of multiple communication tasks simultaneously.
Pros
- High performance CPU
- Isolated RS485
- PoE Ethernet
- RTC Chip
- USB Type-C
Cons
- Price premium
- Requires config
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An isolated RS485 interface protects the system from ground loops and electrical noise, which is vital in factory settings. The RTC chip allows for scheduled tasks independent of network status.
USB Type-C connectivity simplifies firmware updates and debugging during installation. While the price is higher, the robust hardware justifies the investment for critical applications.
Recommended for complex automation systems requiring local scheduling and high-speed processing. Its build quality ensures long-term reliability in challenging environments.
Scheduled Tasks
Built-in RTC enables time-based automation without network dependency.
Debugging Access
USB Type-C port provides easy access for development and updates.
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8. Waveshare 8-Ch Relay (B) – Balanced Feature Set
Waveshare 8-Ch Relay (B)
Digital Linkage
Flash On Off
MQTT Support
Flyback Diode
This model offers a balanced set of features for standard industrial control needs. The digital linkage control allows relays to react automatically to input changes without constant polling.
Pros
- Digital linkage control
- Built-in debouncing
- MQTT demo
- Optocoupler Isolation
- Rail mount
Cons
- Mid-tier rating
- No WiFi support
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The built-in debouncing algorithm ensures stable readings from mechanical switches, reducing false triggers. MQTT support and Alibaba Cloud demos simplify cloud integration for remote monitoring.
While it lacks wireless options, its wired stability and safety features make it a dependable choice. The dedicated driver chip ensures strong performance even under load.
Ideal for industrial automation where consistent wired connections are preferred. It is a solid choice for environments where reliability is more critical than flexibility.
Input Linkage Logic
Automated linkage control simplifies wiring by removing external controllers.
Signal Stability
Debouncing algorithm filters noise from digital input signals effectively.
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9. Pinhaijing LAN Ethernet 2 Way Relay – Affordable Entry Level
Pinhaijing LAN Ethernet 2 Way Relay
STC Microcontroller
Web Server
TCP UDP
5V to 24V
As a budget-friendly option, this module provides basic remote switching capabilities with minimal complexity. It is ideal for hobbyists or small setups requiring simple Internet control.
Pros
- Low cost
- Web interface
- Password protection
- Military grade PCB
- Status LEDs
Cons
- Only 2 channels
- Basic features
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The embedded web server allows for easy management through a standard browser without extra software. Local password protection adds a layer of security for unauthorized access.
Limited to two channels, it is not suitable for large-scale automation but excels in focused tasks. The military-grade PCB material ensures decent durability for the price point.
Best for small home projects or testing remote control concepts. It is an excellent entry point for understanding networked relay operations.
Browser Based Control
No client software is needed to manage relays via local web pages.
Secure Access
Password protection keeps your network commands safe from intruders.
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10. 8-CH Ethernet Relay Module – Standard Industrial Solution
8-CH Ethernet Relay Module
Modbus RTU TCP
PoE Power
Web Config
Optocoupler Isolation
This is a standard industrial module offering reliable Ethernet control for typical applications. It covers the essential protocols and power options required for most facility setups.
Pros
- Standard Modbus
- PoE support
- Web config
- Safety circuits
- Rail mount
Cons
- Generic features
- Basic documentation
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Web browser configuration simplifies setup, allowing for easy IP management through DHCP or DNS. PoE compliance reduces cabling costs in retrofit scenarios.
Documentation is basic, so users might need to rely on community support or trial and error. However, the safety circuits and isolation provide necessary protection for standard use.
Suitable for general maintenance tasks and simple automation. It serves as a dependable workhorse for environments where standard protocols are sufficient.
Configuration Flexibility
Web-based tools simplify network setup without command-line expertise.
Power Efficiency
PoE support lowers infrastructure costs by using network cables for power.
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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 needs. Consider protocol support, power options, and safety features to ensure compatibility and long-term reliability.
Protocol Support
Check if the module supports the communication protocols your system uses. Modbus TCP and RTU are common in industrial settings, while HTTP or MQTT are better for IoT integration.
Prioritize models that support multiple protocols to future-proof your setup against changing system requirements.
Power Supply Options
PoE support is a major advantage for installations where power outlets are distant. It allows you to use a single Ethernet cable for both data and power.
Ensure the module accepts a wide voltage range to accommodate fluctuating power sources or battery backups.
Channel Count
Determine how many independent circuits you need to control. Higher channel counts like 30 reduce the need for multiple units but require more space.
Choose a channel count that matches your device list to avoid overpaying for unused capacity.
Isolation and Protection
Optocoupler isolation protects your network from high-voltage spikes caused by relay switching. This is critical for safety and longevity in industrial environments.
Look for models with reverse-proof circuits and flyback diodes to prevent damage from incorrect wiring.
Wireless Capabilities
Some modern modules offer Wi-Fi or Bluetooth alongside Ethernet. This allows for quick local configuration without needing a physical network port.
Evaluate if wireless features are necessary or if a standard wired connection is sufficient for your setup.
Build Quality
Rail-mount cases are designed for DIN rails found in industrial control panels. Ensure the module fits your existing mounting hardware.
Robust cases protect internal components from dust and physical damage during handling.
Configuration Tools
Web browser interfaces simplify setup compared to command-line tools. Check if the module includes a web server for easy IP configuration.
Good documentation and tutorials save time during the initial installation and debugging phases.
Digital Input Support
Modules with digital inputs can read external sensors directly, reducing the need for extra hardware. This enables automation based on real-world events like button presses.
Ensure the inputs support both wet and dry contact types for flexibility in connecting switches.
How to Use and Care for Your Ethernet Relay Module
First, connect the module to your network using an Ethernet cable and power it on. Access the configuration page through a web browser by entering the default IP address provided in the manual.
Next, verify that your control software can communicate with the device. Test each relay channel individually to ensure it activates and deactivates as expected before final deployment.
Regularly check for firmware updates to maintain security and compatibility. Keep the device free of dust and ensure proper ventilation to prevent overheating during extended operation.
Frequently Asked Questions
Do Ethernet Relay Modules need a dedicated controller?
No, most modules support web browser or standard API access. You can control them using custom scripts, SCADA software, or home automation platforms without extra controllers.
What is the difference between Modbus TCP and RTU?
Modbus TCP runs over Ethernet networks while RTU runs over serial connections. TCP is faster for networked systems, while RTU is better for serial wiring setups.
Can I use these modules outdoors?
Only if the enclosure is rated IP67 or higher. Many models are designed for indoor use, so check the specific product details before outdoor installation.
Is PoE mandatory for operation?
No, PoE is optional. These modules can also run on separate power supplies like DC 7-36V if you do not have a PoE switch available.
How many devices can connect to one module?
Most industrial modules support multiple simultaneous connections for status checks. However, high-frequency command traffic should be managed to avoid network congestion.
Are these modules safe for high voltage?
They use internal isolation to protect low-voltage circuits. Always verify contact ratings match your load to ensure safe switching of high-voltage devices.
Final Thoughts on Choosing the Best Ethernet Relay Module
The top picks offer a range of solutions for both industrial and home automation needs. The Editor's Choice combines protocol flexibility with robust safety features for most users.
Prioritize modules with strong isolation and power options that match your infrastructure. Wireless capabilities can add valuable convenience but are not always necessary.
Prices and availability fluctuate, so compare current offers before purchasing. Selecting the right module ensures your automation project remains reliable and efficient.