Pinhaijing LAN Ethernet 2 Way Relay Board
4.8Editor score
Low cost entry level solution
Simple TCP UDP web server
Compact PCB dimensions
In this guide
Ethernet relay modules provide reliable networked control for industrial automation and smart infrastructure projects. They allow devices to be switched remotely via TCP IP networks using standard protocols like Modbus TCP or HTTP. Choosing the right module ensures stability, safety, and seamless integration into your existing control systems.
We evaluated ten real products available in the current market to determine which units offer the best balance of performance and versatility. Our analysis focused on protocol support, power input options including PoE, isolation features, and physical build quality. This list covers industrial grade rail mount cases as well as compact boards for smaller installations.
Each pick below shows specific strengths like wireless connectivity, digital input support, or dedicated cloud integration features. Prices and availability can change frequently on retail platforms so always verify current stock before ordering. Use these insights to select a module that matches your voltage requirements and communication needs.
Top 3 Picks for Best Ethernet Relay Module
Industrial 8-Ch ESP32-S3 WiFi Relay Module
4.8Editor score
Integrated WiFi and Bluetooth connectivity
PoE and RS485 support included
10A contact rating per relay
8-CH Ethernet Relay Module with Digital Input
4.9Editor score
Full Modbus TCP RTU suite
8 channel digital input support
Multiple network configuration modes
Top 10 Best Ethernet Relay Module in 2026 Compared
The following table provides a side-by-side overview of key specifications for each module. It highlights channel counts, protocol support, and power options to help you quickly identify the hardware that fits your technical requirements.
ProductsSpecificationsEditor scorePrice
Best Budget
8-CH Ethernet Relay Module Modbus
8 channels output
Modbus RTU TCP protocol
PoE power supply option
Optocoupler isolation onboard
3.4Editor score
Editor's Choice
Waveshare 8-Ch Ethernet Relay Module
8 channels output
Modbus RTU TCP protocol
PoE power supply option
Industrial rail mount case
4.1Editor score
Editor's Choice
Industrial 8-Ch ESP32-S3 WiFi Relay
8 channels output
WiFi Bluetooth connectivity
PoE and RS485 ports
Digital input support
4.8Editor score
8-CH Ethernet Relay Module B
8 channels output
Digital input included
Modbus RTU TCP protocol
HTTP MQTT server modes
4.9Editor score
Industrial 8-Ch ESP32-S3 WiFi Relay
8 channels output
WiFi Bluetooth connectivity
RS485 and Ethernet ports
Digital input support
4.6Editor score
Waveshare 30-Ch Ethernet Relay Module
30 channels output
Modbus RTU TCP protocol
PoE power supply option
Industrial rail mount case
4.2Editor score
Waveshare Industrial 8-Channel ESP32
8 channels output
WiFi Bluetooth connectivity
Isolated RS485 interface
Optional PoE support
4.7Editor score
Waveshare 8-Ch Ethernet Relay Module B
8 channels output
Digital input included
Modbus RTU TCP protocol
Industrial rail mount case
4.2Editor score
Pinhaijing LAN Ethernet 2 Way Relay
2 channels output
TCP UDP web server
STC microcontroller chip
Compact PCB size
4.8Editor score
8-CH Ethernet Relay Module Modbus
8 channels output
Modbus RTU TCP protocol
PoE power supply option
Industrial 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 Bluetooth LE
8 relay channels output
RS485 and Ethernet ports
This industrial module combines wireless flexibility with wired reliability. It holds a top rating due to its robust ESP32-S3 core and extensive protection features. You get eight relay channels with high current capacity suitable for heavy loads.
Pros
- High performance LX7 processor
- Multiple wireless options
- Strong isolation protection
- PoE power included
- Digital input support
Cons
- Slightly higher price
- Complex setup for beginners
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The dual mode wireless communication allows you to control devices without physical cables. Ethernet and RS485 ports ensure stable connections for fixed installations. Isolation circuits keep your logic side safe from high voltage spikes.
Setup requires some technical knowledge of network protocols and microcontrollers. The feature set might be overkill for simple on off switching tasks. However the versatility justifies the complexity for serious integrators.
Buy this if you need a versatile hub for mixed industrial and smart home projects. Its rating and connectivity options make it a standout choice in the current market.
Dual Wireless Communication
Integrated 2.4GHz Wi-Fi and Bluetooth LE allow flexible remote control options.
Industrial Safety Features
Onboard isolation and protection circuits ensure stable operation in noisy environments.
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2. Pinhaijing LAN Ethernet 2 Way Relay Board – Best Budget Ethernet Relay Module
Pinhaijing LAN Ethernet 2 Way Relay Board
2 relay channels output
STC microcontroller
TCP UDP support
Compact PCB size
This compact board offers a low cost entry into networked relay control. It is designed for simple switching tasks rather than complex industrial automation. Users praise its ease of use and straightforward web server interface.
Pros
- Very affordable price
- Simple web interface
- Small footprint
- Status indicators included
- Easy power input
Cons
- Only two channels
- Limited industrial features
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You can control the relays via a local web page or simple TCP commands. The board fits easily into tight enclosures due to its small dimensions. Status LEDs make it simple to see if a relay is active.
It lacks advanced protocols like Modbus or PoE support found in premium units. The limited channel count restricts use to small scale applications. However for basic tasks it delivers excellent value.
Choose this for hobbyist projects or small lighting control needs. Its price and simplicity make it an ideal budget pick for basic automation tasks.
Simple Web Server
A built-in web interface allows control via any browser on your network.
Compact Design
Small PCB dimensions make it easy to fit in limited spaces.
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3. 8-CH Ethernet Relay Module with Digital Input – Best Premium Ethernet Relay Module
8-CH Ethernet Relay Module with Digital Input
8 relay channels output
8 digital inputs included
Modbus RTU TCP
PoE compliant
This premium module delivers top tier reliability for critical control applications. It features a robust industrial design with eight relays and eight digital inputs. The high rating reflects its stability and comprehensive feature set.
Pros
- High reliability
- Bidirectional isolation
- Multiple network modes
- Wide voltage input
- Dynamic IP support
Cons
- Premium price point
- Requires network knowledge
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You get extensive protocol support including HTTP, MQTT, and Modbus TCP. PoE compliance simplifies cabling by combining power and data in one line. The wide voltage input range accommodates various power sources.
The complexity of configuration requires a dedicated network administrator or engineer. The price is higher than standard boards but matches the industrial grade quality. It is built for long term continuous operation.
Invest in this if you need a highly reliable control node for factory or building automation. Its inputs and protocol flexibility justify the investment for professional users.
Advanced Protocol Support
Supports TCP Server, Client, UDP, and HTTP for flexible integration.
Power Flexibility
PoE and wide DC input options ensure you can power it anywhere.
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4. 8-CH Ethernet Relay Module Modbus – Solid Industrial Controller
8-CH Ethernet Relay Module Modbus
8 relay channels
Modbus RTU TCP
PoE power
Optocoupler isolation
This unit focuses on essential Modbus control for industrial equipment. It provides eight relay channels with solid isolation and power options. Users note its reliability in continuous operation environments.
Pros
- Stable communication
- Flash functions included
- Rail mount case
- Reverse proof circuit
- Cloud MQTT demo
Cons
- Lower customer rating
- Basic feature set
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The flash-on and flash-off functions allow for temporary signaling or testing. Alibaba Cloud MQTT demo offers easy integration with smart systems. The ABS case makes it safe to mount on a rail.
The lower rating suggests some inconsistencies in user experience or documentation. It lacks advanced input features found in higher tier models. However it remains a viable choice for standard switching.
Select this for straightforward Modbus control needs without extra bells or whistles. It offers a balance of industrial design and basic network functionality.
Flash Control
Pass arguments to commands for temporary relay activation.
Cloud Integration
Includes demo for Alibaba Cloud MQTT application setup.
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5. Waveshare 8-Ch Ethernet Relay Module – Reliable Industrial Option
Waveshare 8-Ch Ethernet Relay Module
8 relay channels
Modbus RTU TCP
PoE port
Optocoupler isolation
Waveshare is known for solid hardware design and this module is no exception. It provides standard Modbus control with eight outputs and PoE capability. The inclusion of status LEDs helps with troubleshooting.
Pros
- LED status indicators
- Safe rail mount case
- Reverse protection
- Flash functions
- Wide voltage input
Cons
- Similar features to others
- Average performance
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The protection circuits prevent damage from reverse connections or high voltage. It supports both flash-on and flash-off modes for versatile signaling. The case is designed for industrial rail mounting.
It does not offer unique features that distinguish it from similar generic modules. Performance is adequate for most standard automation tasks. Users appreciate the safety features and build quality.
Choose this for a safe and standard industrial control solution. It balances cost and reliability well for basic networked switching.
Visual Feedback
Network indicators show MCU and signal transceiving status clearly.
Reverse Protection
Built-in circuit prevents accidental damage from incorrect wiring.
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6. Industrial 8-Ch ESP32-S3 WiFi Relay – Robust Wireless Control
Industrial 8-Ch ESP32-S3 WiFi Relay
8 relay channels
WiFi Bluetooth LE
RS485 port
Digital inputs
This unit offers a rich set of connectivity options for advanced users. It integrates Wi-Fi, Bluetooth, and RS485 for flexible control. The industrial design ensures it can handle tough conditions.
Pros
- High performance processor
- Arduino IDE support
- SDK included
- Strong protection
- Digital input support
Cons
- Complex for beginners
- Requires development knowledge
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Developers can use Arduino IDE and the provided SDK to customize the module. The high processor speed ensures responsive control. Isolation circuits keep the logic safe from power surges.
The feature set is extensive and might require time to fully utilize. It is more complex than simple plug-and-play modules. Users with coding skills will find it very rewarding.
Invest in this if you need a programmable industrial controller. Its connectivity and development resources make it great for custom automation.
Developer Friendly
Supports Arduino IDE with comprehensive SDK and tutorials.
High Performance
Built-in 32-bit dual-core processor up to 240MHz.
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7. Waveshare 30-Ch Ethernet Relay Module – High Channel Count
Waveshare 30-Ch Ethernet Relay Module
30 relay channels
Modbus RTU TCP
PoE power
Relay driver chip
This module provides a high channel count for complex installations. It is ideal for agriculture, farming, or large facility control. The build quality matches other industrial grade units.
Pros
- Many channels
- Strong driving ability
- Flash functions
- Cloud demo
- Stable communication
Cons
- High power usage
- Large footprint
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It handles 30 relays with stable communication and driver chips. The dedicated relay driver chip ensures stronger stable driving ability. Status LEDs help monitor activity for all channels.
The physical size and power requirements are higher than smaller boards. It may not fit in tight enclosures. However for multi point control it is a solid choice.
Use this when you need to control many devices from a single network point. Its channel count and stability are its main selling points.
Scalable Control
30 relays allow control of large farms or facilities.
Strong Drivers
Dedicated relay driver chip for stable performance.
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8. Waveshare Industrial 8-Channel ESP32 – High Speed Processing
Waveshare Industrial 8-Channel ESP32
Xtensa dual core
WiFi Bluetooth
Isolated RS485
PoE optional
This module emphasizes high speed processing for responsive control. It uses the Xtensa 32-bit LX7 processor for quick operations. The wireless features are integrated for easy remote access.
Pros
- Fast processing speed
- Linked input control
- RTC chip included
- USB Type-C debug
- Rich Wiki resources
Cons
- PoE optional version
- Requires monitoring
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It includes a real time clock for scheduled tasks without external controllers. USB Type-C allows easy debugging and power for development. The Wiki resources provide good documentation support.
The optional PoE feature means you must verify the specific model. It might not support direct PoE power in all versions. Users should check specs carefully before purchase.
Buy this if you need fast processing and flexible control options. The documentation and development tools make it accessible for technical users.
Time Based Control
RTC chip supports scheduled tasks for automation.
Debugging Ease
USB Type-C port makes firmware downloading simple.
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9. Waveshare 8-Ch Ethernet Relay Module B – Flexible Input
Waveshare 8-Ch Ethernet Relay Module B
8 relay channels
Digital inputs included
Modbus TCP
PoE power
This version includes digital inputs for sensor integration. It supports linkage control to link inputs directly to outputs. The debouncing algorithm ensures clean signal processing.
Pros
- Debounce algorithm
- Linkage control
- Flyback diode
- Rail mount case
- Status LEDs
Cons
- Complex logic
- Advanced setup
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Relay protection includes flyback diodes for stable driving. The rail mount case makes it suitable for control panels. Status indicators help with visual monitoring of the unit.
The linkage features require configuration to set up correctly. It is not a simple plug and play device for basic users. However the logic capabilities add value.
Select this if you need input output logic on a single device. It simplifies wiring by combining inputs and outputs effectively.
Smart Linkage
Digital inputs can link directly to relays for logic control.
Clean Signals
Debounce algorithm ensures accurate digital input processing.
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10. 8-CH Ethernet Relay Module Modbus – Standard Industrial Choice
8-CH Ethernet Relay Module Modbus
8 relay channels
Modbus TCP
PoE power
Rail mount case
This module offers a standard industrial solution for Ethernet control. It supports both DHCP and DNS for flexible network setup. The rail mount case provides secure mounting.
Pros
- Dynamic IP support
- DNS protocol
- Flash functions
- Wide voltage
- Web config
Cons
- Basic features
- Average rating
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Web browser configuration makes network setup easy without special tools. It supports wide voltage input for flexibility in power sources. The optocoupler isolation ensures safety.
It does not offer unique features that set it apart from competitors. Performance is average but sufficient for standard tasks. Users value the web interface for setup.
Choose this for a straightforward industrial relay module. It balances cost and functionality well for general automation.
Easy Config
Web browser configuration simplifies network setup.
Network Flexibility
DHCP and DNS support for easy network integration.
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Buying Guide – How to Choose the Best Ethernet Relay Module
Selecting the right module depends on your channel count needs, communication protocols, and power options.
Channel Count
Determine how many devices you need to control simultaneously. For simple tasks 2 to 4 relays may suffice. For complex systems consider 8 to 30 channels to reduce the need for multiple units.
Select a channel count that matches your current and future expansion plans.
Protocol Support
Check if your system requires Modbus TCP RTU HTTP or MQTT. Some modules are better for factory automation with Modbus while others are better for smart home with HTTP MQTT. Ensure compatibility with your existing controller software.
Always verify protocol compatibility with your control software before buying.
Power Supply
Evaluate if PoE is a requirement for your location. PoE reduces cable runs but limits power availability. Standard DC input is more common and easier to source for many industrial setups.
Choose PoE if cabling is difficult otherwise standard DC is more flexible.
Wireless Connectivity
Consider adding WiFi or Bluetooth if you need remote control without cables. Wireless adds flexibility but may introduce latency or security risks. Wired Ethernet is always more stable for critical tasks.
Use wireless for convenience and wired for stability in critical paths.
Digital Inputs
Modules with digital inputs allow sensor feedback or button control. This enables logic without a separate controller. If you need to read switches or sensors look for opto isolated inputs.
Select inputs if you need sensor feedback for automation logic.
Isolation and Protection
Look for optocoupler isolation to protect your network from high voltage. Reverse-proof circuits prevent damage from wiring errors. These features are essential for safety in industrial environments.
Ensure opto isolation to protect your low voltage logic circuits.
Physical Build
Check if the module supports DIN rail mounting for industrial panels. Compact PCBs are better for small boxes or enclosures. Metal cases provide better heat dissipation than plastic.
Pick a housing that fits your mounting environment securely.
Development Resources
Check for SDKs documentation or Wiki support. Good documentation reduces setup time and helps troubleshooting. If you need to custom code the module resources are valuable.
Ensure good documentation is available for easier integration.
How to Use and Care for Your Ethernet Relay Module
Connect the module to your network using an Ethernet cable or configure WiFi settings via the web interface. Assign a static IP address to prevent connection issues if the device reboots.
Use the provided software or protocol commands to test the relays. Start with single channel control before automating sequences to ensure the wiring is correct and the relays click as expected.
Periodically check the network indicators to ensure the device stays online. Keep the unit in a ventilated area to avoid heat buildup which can reduce lifespan and reliability.
Frequently Asked Questions
Can I use a relay module for high voltage appliances?
Most industrial modules support up to 10A at 250VAC which covers typical household appliances. However you should always check the specific contact rating and use appropriate safety enclosures when dealing with mains voltage.
Is PoE mandatory for these modules?
No PoE is optional on most models. You can power them via a standard DC adapter or screw terminals. PoE is useful if you want to reduce cabling clutter but not required for operation.
Do I need a separate controller?
Not necessarily if the module supports HTTP or MQTT directly. You can control it via a phone or PC browser. For complex logic you might still need a PLC or central controller to manage sequences.
How do I configure the IP address?
Most modules allow configuration via a web browser or DHCP. You can also use tools like ARP to set a static IP. Follow the manufacturer guide to avoid losing network access.
What is Modbus TCP used for?
Modbus TCP is a standard protocol for industrial automation. It allows the module to talk to PLCs and SCADA systems. If you work in a factory you will likely need a module that supports this.
Can these modules be used outdoors?
Most are designed for indoor control panels. If used outdoors you need an IP rated enclosure to protect against water and dust. The modules themselves are not typically waterproof.
Are the inputs opto isolated?
Many models include optocoupler isolation for inputs. This protects the logic from high voltage noise. Always verify this feature in the specs if safety is a major concern.
Final Thoughts on Choosing the Best Ethernet Relay Module
We reviewed ten options ranging from budget boards to industrial grade units with advanced features. The ESP32 based modules offer the best balance of modern connectivity and processing power. For pure industrial reliability the Modbus RTU TCP units remain strong contenders.
Prioritize isolation and protocol compatibility when making your final choice. A module that fits your network and safety needs is more valuable than one with extra features you do not use.
Always check current prices and stock levels before ordering as availability can change quickly. With the right module you can automate your devices safely and efficiently for the long term.