SunFounder 2 Channel DC 5V Relay Module with Optocoupler Low Level Trigger Expansion Board Compatible with Arduino R3 MEGA 2560 1280 DSP ARM PIC AVR STM32 Raspberry Pi
4.6Editor score
Two channel control
Low level trigger
Standard interface
In this guide
Selecting the right 5V relay module is essential for any electronics hobbyist or engineer working with microcontrollers. These boards allow you to switch high voltage or current loads using low voltage signals safely.
We compared ten top rated modules based on isolation quality, trigger flexibility, and build durability. Our analysis covers single to multi channel options suitable for Arduino, Raspberry Pi, and industrial projects.
Each pick highlights specific strengths like optocoupler isolation or fault tolerance. Note that availability and pricing may fluctuate so check current listings before purchasing for your specific application needs.
Top 3 Picks for Best 5V Relay Module
4pcs DC 5V Relay Module – 1 Channel Relay Switch Board with Optocoupler Isolation, High or Low Level Trigger
4.6Editor score
Optocoupler isolation
Fault tolerant design
High or low trigger
ELEGOO 4 Channel DC 5V Relay Module with Optocoupler for Arduino Projects
4.5Editor score
Four independent channels
Active low input
Status LEDs
Top 10 Best 5V Relay Module in 2026 Compared
The following table presents a side by side comparison of the ten selected 5V relay modules. It highlights key specifications such as channel count, isolation type, and trigger modes to help you find the exact fit for your project.
ProductsSpecificationsEditor scorePrice
Editor's Choice
4pcs DC 5V Relay Module
Single channel module
Optocoupler isolation
Fault tolerant design
High low trigger
4.6Editor score
Editor's Choice
HiLetgo 2pcs 5V One Channel Relay Module
Two units pack
SMD optocoupler
Fault tolerant design
Jumper trigger
4.6Editor score
Best Budget
SunFounder 2 Channel DC 5V Relay Module
Two channels
Low level trigger
Standard interface
LED indication
4.6Editor score
5v Relay Module 5V Indicator Light LED 1 Channel Relay Module for Arduino ARM PIC AVR MCU
TTL signal
Open closed contacts
Appliance control
Motor control
4.6Editor score
2PCS 5V 4 Channel Relay with Optocoupler
Four channels
Opto isolated
Screw terminals
Bolt holes
4.3Editor score
4pcs DC 5V Relay Module 2 Channel Relay Board
Two channels
Opto isolated
Screw terminals
Fault tolerant
4.4Editor score
HiLetgo 2pcs 5V 30A One Channel Relay Module
High current
Optocoupler isolation
Three voltage options
Terminal leads
4.6Editor score
ELEGOO 4 Channel DC 5V Relay Module
Four channels
Active low input
Status LEDs
JD VCC config
4.5Editor score
8 Channel Relay Module DC 5V Relay Board
Eight channels
Opto isolated
Fault tolerant
High current
4.5Editor score
5V One Channel Relay Module Relay Switch with OPTO Isolation High Low Level Trigger (Pack of 10)
Ten units pack
Dual indicators
Patch optocoupler
High quality
4.7Editor score
1. 4pcs DC 5V Relay Module – Best Overall 5V Relay Module
4pcs DC 5V Relay Module – 1 Channel Relay Switch Board with Optocoupler Isolation, High or Low Level Trigger
Working voltage DC 5V
Max load AC 250V
Fault tolerant design
Optocoupler isolation
This single channel module is the top choice for its balance of safety and flexibility. It carries a high rating and features a fault tolerant design that protects your microcontroller from relay switch currents.
Pros
- Strong driving ability
- Stable performance
- Direct terminal wiring
- High low jumper
- Wide compatibility
Cons
- Single channel per unit
- Requires external power
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The optocoupler isolation is a standout feature that ensures strong driving ability and stable performance. You can set the unit to respond to high or low signals using the jumper, making it versatile for any logic system.
While it is a single channel unit, the screw terminals allow you to wire normally open and normally closed connections directly. The fault tolerant design ensures safety even if the control line is broken during operation.
Anyone needing a reliable and safe interface for ARM PIC AVR or MCU projects should choose this module. It works well with Raspberry Pi and CNC machines providing a solid foundation for automation tasks.
Enhanced Safety via Optocoupler Isolation
The isolation circuit prevents damages to your I/O port by blocking relay switch currents from reaching the control board.
Versatile Trigger Configuration
The jumper design allows you to easily set whether the state changes with high or low signal without hardware modification.
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2. HiLetgo 2pcs Relay Module – Great Value Bundle
HiLetgo 2pcs 5V One Channel Relay Module Relay Switch with OPTO Isolation High Low Level Trigger
Pack of 2 units
SMD optocoupler isolation
Maximum load 10A
Human nature interface
This bundle offers two single channel modules which is ideal if you need redundancy or separate control points. It maintains a high rating and uses genuine quality relays with SMD optocoupler isolation for stability.
Pros
- Genuine quality relay
- Strong driving capability
- Direct connection leads
- Fault tolerant design
- Easy jumper settings
Cons
- Pack size limits bulk
- No multi channel board
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The interface design is praised for being human nature allowing all interfaces to be available through direct connection terminal leads. The fault tolerant design ensures the relay will not move even if the control line is broken.
You can set the trigger level via jumper to match your logic requirements. While it is a pack of two units the individual nature of each board gives you flexibility to mount them separately in your project.
This option is perfect for users who need reliable single channel control without needing a complex multi channel board. The stable performance and high driving capability make it suitable for various automation needs.
Convenient Terminal Access
All interfaces are available through direct connection terminal leads making wiring convenient and straightforward for any setup.
Robust Fault Tolerance
Even if the control line is broken the relay will not move ensuring safety and preventing accidental activation.
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3. SunFounder 2 Channel Relay Module – Best Budget Option
SunFounder 2 Channel DC 5V Relay Module with Optocoupler Low Level Trigger Expansion Board Compatible with Arduino R3 MEGA 2560 1280 DSP ARM PIC AVR STM32 Raspberry Pi
Two channel interface
AC250V 10A load
Indicator LED's
Standard interface
SunFounder offers a budget friendly two channel module that is highly compatible with common microcontrollers like Arduino and Raspberry Pi. It features high-current relays capable of handling AC250V 10A loads effectively.
Pros
- High-current relay
- Low level trigger
- Arduino compatible
- Status indication
- Compact size
Cons
- Low level trigger only
- No jumper change
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The board includes indicator LED's for relay output status which helps during wiring and troubleshooting. Its standard interface allows for direct control by microcontrollers including 8051 AVR PIC DSP ARM and STM32.
While it is optimized for low level trigger it provides solid performance for most hobbyist applications. The compact dimensions make it easy to fit into enclosures without taking up excessive board space.
This module is an excellent choice for beginners or projects requiring two independent relays on a tight budget. Its wide compatibility ensures it works well with various development environments.
Clear Visual Status Indicators
Indicator LED's provide clear visual feedback on relay output status making it easier to verify operation.
Wide Controller Support
The standard interface supports a wide range of microcontrollers making it a versatile expansion board for many users.
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4. 5V Relay Module – Simple Single Channel Control
5v Relay Module 5V Indicator Light LED 1 Channel Relay Module for Arduino ARM PIC AVR MCU
TTL control signal
220V AC Load
Open closed contacts
MCU compatible
This module is designed for simple appliance and motor control using TTL signals. It supports a control signal range of 5V to 12V which offers flexibility for different logic levels.
Pros
- Appliance control
- Motor control
- Simple wiring
- Indicator light
- Broad signal range
Cons
- Basic features
- No isolation mention
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It includes a normally open and normally closed contact allowing you to configure the load behavior easily. The indicator light helps you visually confirm the power and working status at a glance.
The straightforward design makes it useful for controlling power-demanding appliances with a simple digital output. You can connect a digital output directly to the module to switch loads efficiently.
For users needing a basic and effective solution for controlling motors or LED strips this module is a solid pick. Its broad compatibility with development boards ensures easy integration.
Flexible Load Connection
The module supports both normally open and normally closed contacts for versatile circuit configurations.
TTL Signal Support
Support for 5V to 12V TTL signals allows compatibility with a wide range of microcontroller outputs.
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5. 2PCS 5V 4 Channel Relay – High Density Bundle
2PCS 5V 4 Channel Relay with Optocoupler High/Low Level Trigger
Pack of 2
4 channel isolated
Screwed terminal
Bolt holes
This bundle provides two 4-channel modules which gives you eight channels of control in total. Each relay can be individually switched on or off via opto-isolated digital inputs for precise management.
Pros
- Reliable opto isolation
- 10A load rating
- Installation holes
- Versatile trigger
- Stable performance
Cons
- Higher price point
- Two units only
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The modules are equipped with a screwed terminal plate and fixed bolt holes for easy installation on any surface. The opto isolation ensures reliable triggering and stable performance across all channels.
A fault-tolerant design prevents movement if the control line breaks adding an extra layer of safety. You can reverse input logic using the jumper to suit high or low level trigger requirements.
Ideal for projects requiring multiple independent loads this bundle offers density and safety. The 10A load rating per relay handles most standard applications effectively.
Secure Mounting Options
Fixed bolt holes on both sides provide secure mounting for reliable installation in various enclosures.
Opto-Isolated Inputs
Each channel uses an opto-isolated digital input to separate control stages from the relay drive circuitry.
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6. 4pcs 2 Channel Relay – Bulk Multi-Channel Value
4pcs DC 5V Relay Module 2 Channel Relay Board with Optocoupler Support High or Low Level Trigger
Pack of 4
2 channel isolated
High current
Fault tolerant
This package includes four 2-channel boards giving you eight total channels for your project. Each relay can individually switch on or off via an opto-isolated digital input for flexible control.
Pros
- Screwed terminal plate
- Individually switchable
- Stable triggering
- Microcontroller compatible
- High current relay
Cons
- Board quality varies
- Standard size only
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The fault-tolerant design ensures the relay will not move even if the control line breaks during operation. Opto isolation makes triggering more reliable and stable for sensitive microcontroller outputs.
Screwed terminal plates and fixed bolt holes facilitate easy installation and secure wiring. The standard interface connects directly with a wide range of microcontrollers like Arduino and ARM.
This bulk option is great for larger deployments or production runs where quantity is needed. The 10A load rating provides sufficient power for most standard industrial or hobby loads.
Individual Channel Control
Each relay can individually switch on or off allowing for precise control of separate loads.
Secure Wiring Solutions
Screwed terminal plates and bolt holes ensure your connections remain stable over long term use.
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7. HiLetgo 30A Relay – High Current Capability
HiLetgo 2pcs 5V 30A One Channel Relay Module Optocoupler Isolation High and Low Trigger 5V
30A relay current
5V 12V 24V
Friendly interface
Optocoupler isolation
This module stands out with a 30A relay capacity which is significantly higher than standard 10A boards. It supports 5V 12V and 24V inputs making it adaptable to various power systems.
Pros
- High current rating
- Multi voltage support
- Strong drive capability
- Convenient terminals
- Stable performance
Cons
- Expensive per unit
- Single channel only
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The optocoupler isolation ensures strong drive capability and stable performance during high load switching. Friendly interface design allows all interfaces to be directly connected through terminal leads.
Trigger current is kept at 5mA ensuring efficient control without drawing excess power from your logic board. The high current rating makes it suitable for demanding loads like heaters or heavy motors.
If you need high current handling and flexible voltage support this module is an excellent investment. The reliable isolation and strong performance justify the higher cost for critical applications.
High Current Handling
The relay is designed for high current loads up to 30A making it ideal for heavy duty applications.
Flexible Voltage Input
Support for 5V 12V and 24V inputs allows you to use this module in diverse power environments.
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8. ELEGOO 4 Channel Relay – Best Premium Quality
ELEGOO 4 Channel DC 5V Relay Module with Optocoupler for Arduino Projects
Four independent channels
Active low input
10 A contact rating
NO/NC terminals
ELEGOO delivers a premium 4-channel module with clear design for Arduino and compatible microcontrollers. It uses active-low inputs and includes status LEDs for easier wiring checks and troubleshooting.
Pros
- Active low inputs
- Status LEDs
- Flexible wiring
- Optocoupler equips
- Quality build
Cons
- No jumper toggle
- Active low logic
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Each relay channel includes NO COM and NC screw terminals allowing flexible wiring for normally open or normally closed operations. Optocoupler-equipped input stages separate control stages from relay drive circuitry.
The board is rated for 10A at 250V AC or 30V DC under manufacturer specified conditions. Its robust build ensures reliable operation in projects requiring multiple independent switching points.
This module is perfect for complex automation tasks needing precise control and clear visual indicators. The quality construction and clear documentation make it a top choice for professional projects.
Active Low Input Design
Each channel uses an active-low input which simplifies logic for common microcontroller GPIO configurations.
Visible Status LEDs
Status LEDs on each channel help you verify the state of each relay quickly during setup and debugging.
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9. 8 Channel Relay Module – Maximum Channel Count
8 Channel Relay Module DC 5V Relay Board with OPTO-Isolated Support High or Low Level Trigger
Eight channel module
Opto isolated
High load 10A
Jumper setting
This board offers eight independent channels making it ideal for projects needing many control points. Each relay can individually switch on or off via an opto-isolated digital input for reliable operation.
Pros
- High current relays
- Fault tolerant
- Stable triggering
- Screw terminals
- Direct connection
Cons
- Large form factor
- Power draw
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The module supports both high and low level trigger through jumper settings providing versatile control logic. It is designed with fault-tolerant protection ensuring safe operation even if control lines break.
High current relays handle up to 10A per channel with a maximum load of AC 250V or DC 30V. Screwed terminal plates and bolt holes make installation secure and professional.
Choose this board when you need maximum channel density without splitting the project across multiple boards. The stable triggering and isolation features ensure consistent performance for complex applications.
High Density Control
Eight channels on one board save space and reduce wiring complexity for large scale control projects.
Opto-Isolation Security
Each channel is opto-isolated to protect your microcontroller from high voltage spikes during switching.
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10. 10-Pack Relay Module – Best Bulk Purchase
5V One Channel Relay Module Relay Switch with OPTO Isolation High Low Level Trigger (Pack of 10)
Pack of 10 units
Insulation design
Dual indicators
Humanized input
This pack offers ten single channel modules which is perfect for stocking up or multi unit projects. It includes dual indicator lights for power and relay status to help with quick status checks.
Pros
- Convenient wiring
- High quality relay
- Insulation circuit
- Wide range use
- Dual lights
Cons
- Basic features
- Individual units
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The insulation design uses a patch optocoupler to prevent relay switching current from damaging the E/A port. Humanized input and output terminals make wiring convenient and straightforward.
High quality relays ensure a maximum load of AC 250V or DC 30V. The wide range of applications makes it suitable for all kinds of single-chip microcomputers and power control occasions.
For users building many units or needing spares this bulk option provides great value and high ratings. The convenient design and reliable insulation make it a safe choice for general control tasks.
Dual Indicator Lights
Green power and red relay status indicators give you immediate visual feedback on the board state.
Humanized Terminal Design
Input and output terminals are designed for convenient wiring making setup easier for new users.
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Buying Guide – How to Choose the Best 5V Relay Module
Selecting the right relay module involves considering channel count, isolation quality, and trigger logic. This guide outlines the key factors to help you match a module to your specific project requirements.
Channel Count and Density
Choose a single channel module if you only need to control one load but opt for 4 or 8 channel boards for complex projects. Higher density boards save space on your breadboard or enclosure.
Optocoupler Isolation
Look for modules with optocoupler isolation to protect your microcontroller from high voltage spikes generated by the relay coil. This feature ensures safer and more stable operation in demanding environments.
Trigger Level Logic
Ensure the module supports high or low level trigger depending on your microcontroller's output logic. Some boards have jumpers to switch between modes which adds flexibility for your design.
Load Current Rating
Check the maximum load current rating to ensure it meets your appliance requirements. Most boards handle 10A but some high current options offer 30A for heavier motor or heater loads.
Terminal Type
Screw terminals are preferred over header pins for secure connections and easier wiring. They allow you to use standard wire gauges and provide a reliable mechanical connection for long term use.
Indicator LEDs
Status LEDs for power and relay state help you troubleshoot and verify operation quickly. Boards with individual LEDs for each channel make it easier to manage multiple relays.
Mounting and Size
Consider the physical dimensions and if the board includes bolt holes for mounting. A compact size is useful for tight enclosures while mounting holes ensure the board stays secure during transport.
Compatibility
Verify that the module is compatible with your specific microcontroller like Arduino PIC or ARM. Most boards work with standard logic levels but checking the input voltage range prevents compatibility issues.
How to Use and Care for Your 5V Relay Module
Connect the VCC and GND pins to a stable 5V power supply ensuring your microcontroller logic voltage matches the trigger logic. Never connect high voltage loads directly to the microcontroller pins.
Wire the load to the COM NO and NC terminals according to whether you need a normally open or normally closed circuit. Ensure the wire gauge matches the relay's current rating for safety.
Place the module in a well ventilated enclosure to prevent heat buildup and avoid exposure to moisture or dust. Regularly check the connections for tightness to maintain reliable operation over time.
Frequently Asked Questions
Can a 5V relay module control 220V AC loads?
Yes most 5V relay modules can safely switch 220V AC loads as long as the current is within the rated limit such as 10A. Always ensure the module explicitly states AC voltage ratings to avoid risks.
Do I need a separate power supply for the relay module?
It is recommended to use a separate power supply for the relay module to prevent voltage drops in your microcontroller. The control signals can still be shared with your board via ground connection.
What is the difference between NO and NC on a relay module?
NO stands for Normally Open meaning the circuit is open until the relay is activated. NC stands for Normally Closed meaning the circuit is closed until the relay is activated.
How does optocoupler isolation protect my circuit?
Optocoupler isolation uses light to transmit signals between the control and relay circuits. This prevents electrical noise or spikes from the relay coil from damaging your sensitive microcontroller ports.
What logic level should I set for my Arduino project?
Most modules support both high and low trigger so you can use a jumper to select the one your board outputs. If your board outputs 5V for HIGH choose the High Trigger setting.
Why does my relay click when it is not supposed to?
This could be due to noise on the control line or insufficient power. Add a capacitor across the VCC and GND pins to smooth out the voltage and reduce interference.
Can I daisy chain multiple relay modules together?
You can control multiple modules from one microcontroller if you have enough GPIO pins. Daisychaining power is not recommended; use a stable central power supply for all modules.
Is it safe to touch the relay terminals when it is powered?
No you should never touch the terminals while the board is powered as the relay switches high voltage. Always disconnect power before making any wiring changes to avoid electric shock.
Final Thoughts on Choosing the Best 5V Relay Module
The 4pcs DC 5V Relay Module stands out as the overall best choice for its fault tolerant design and optocoupler isolation. The SunFounder 2 Channel Relay Module offers the best value for budget conscious projects.
Prioritize safety and reliability by choosing modules with proper isolation and secure screw terminals. Match the trigger logic to your microcontroller to avoid wiring complications.
Remember that prices and availability change frequently so check the current listings before making your purchase. Ensure you select the right channel count and load rating for your specific needs.