The Best 3.3V Relay Board of 2022 – Reviewed and Top Rated
After hours researching and comparing all models on the market, we find out the Best 3.3V Relay Board of 2022. Check our ranking below.
2,815 Reviews Scanned
- Original Songle Relay
- 30VDC 250VAC Load：The power switch is compatible with 10A 250VAC and 10A 30VDC load.
- Optocoupler Isolator:3V/3.3V power relay module supports photocoupler isolation control.
- DC 5V 3 Channel Relay Module Relay Expansion Board with Optocoupler Insulation for Arduino
- 3-Channel Relay Module With Optocoupler Isolation Compatible 3.3V 5V Signal
- Size:63*42*20mm
- Trigger Level:3V-7V trigger,Trigger Current:5mA
- Control Voltage:AC 0-250V or DC 0-30V,Control Current:0-7A
- 3.3V Relay Module：Compatible with for Power Switching LED Lights Small Motors Circuit Isolation Signal Conversion
- Size：70*17*20mm
- Voltage: DC 3V/3.3V
- Load：10A 250VAC；10A 30VDC
- Commodities include：6Pcs 3V/3.3V Relay Module
- 3V 1 channel relay interface board support photocoupler isolation control,has the output signal indicator,the signal input port can connect SCM IO port, high level signal drive
- Relay board provides a single relay that can be controlled by any 3V/3.3V digital input from your microcontroller IO, support dual power supply input ensure high anti-interference ability,high reliability of photoelectric isolation protection
- 3V/3.3V power relay module supports photocoupler isolation control and dual power supply input ensure high anti-interference ability. with diode continuous flow protection,response time is less than 20 milliseconds,long life of relay can be absorbed 100,000 times continuously.
- You can select whether the relay and the signal use the same power supply or not by removing the jumper caps on the pins. And It is better to share the same power supply, because that is more convenient for using.
- Relay Module: SRD-DC03V-SL-C; Channel: 1 channel; Working Voltage: DC 3-3.3V; Compatible Load: 10A 250VAC / 10A 30VDC; Single Socket Length: 7.5mm
- Indicator with output signal
- The signal input port can be connected to the IO port of the single chip microcomputer, and the high-level signal is driven
- Dual power supply selection design has strong anti-interference ability and high reliability of photoelectric isolation protection
- Onboard 3V,10A/250VAC; 10A/30V DC relay, which can be continuously closed for 100,000 times, with diode laxative protection, short response time
- The external connection adopts rotary crimping terminal to make the connection firmer, With fixed mounting holes for easy installation
- 【30VDC 250VAC Load】 Equiped with high-current relay, AC250V 10A ; DC30V 10A, each relay has normally open and normally closed contact. Can be selected by jumper relay and TTL or ground.
- 【High Level Trigger】The relay module is triggered by high level signal, which can be input from microcontroller IO.
- 【 3V/3.3V power relay module】- This Relay Board provides a single relay that can be controlled by any 3V/3.3V digital input from your microcontroller IO.
- 【Wide Application】- These 3v relay board works well with ARM /PIC /AVR /MCU/Raspberry/CNC machine/ PS4/3.3V /NodeMCU/ ESP8266 module etc.
- 【Long Life】 - Fast response time less than 20ms and long lifetime up to 100,000 times snap action with diode freewheel protection.
- 3V Relay Module: Working Voltage: DC 3-3.3V; Working Current: 65mA; Trigger Current: 3mA;Load: 10A 250VAC / 10A 30VDC;Load Current: 10A max
- Optocoupler Isolator: 3V/3.3V Power Relay Module Supports Photocoupler Isolation Control
- High Level Trigger: The Relay Module is Triggered by High Level Signal, Which Can Be Input From Microcontroller IO
- Jumper Caps: By Removing the Jumper Caps on the Pins,You can Select Whether the Relay and the Signal Share the Same Power Supply or Not,But We Are Recommended to Share the Same Power Supply
- Wide Application: These 3V Relay Power Switch Module Works Well With ARM /PIC /AVR /MCU/CNC Machine/ PS4 etc.
- 8 channel I2C Interfaced Relay Channels (EMR Type): Built around the reliable XL9535 GPIO expander chip, providing precise control via I2C interface. Supports up to 10A per channel for AC/DC loads.
- Dual Power Support – 3.3V & 5V: Isolate logic (3.3V) and relay (5V) power for cleaner signals and stable operation. Ideal for both 3.3V (ESP32, Pi) and 5V (Arduino) microcontrollers.
- Compact, DIN Rail Friendly Design: Measuring 150mm x 72mm, this board includes a vertical USB-C port and marked DIP switches for I2C address configuration – perfect for industrial enclosures.
- Versatile Compatibility: Works Compatible with Arduino, ESP32, Raspberry Pi, and other I2C-enabled controllers. Great for smart homes, industrial automation, and IoT projects using Home Assistant or ESPHome. Straightforward IIC communication, this module integrates seamlessly with your existing setup
- Robust & Reliable Build: Professionally designed PCB with high-isolation SPDT relays (10A@250VAC), rated for 100,000+ electrical and 10M+ mechanical operations. Comes in a protective box for secure delivery.
- MAIN FUNTION : Support all MCU control, industrial field, PLC control, smart home control, VCC system power supply, etc.Strict quality control and quality assurance, high safety factor, can be used with peace of mind.
- MAIN FUNTION : Support all MCU control, industrial field, PLC control, smart home control, VCC system power supply, etc.Strict quality control and quality assurance, high safety factor, can be used with peace of mind.
- MAIN FUNTION : Support all MCU control, industrial field, PLC control, smart home control, VCC system power supply, etc.Strict quality control and quality assurance, high safety factor, can be used with peace of mind.
- Application: The relay module supports all MCU control, industrial field, PLC control, smart home control, VCC system power supply, etc.
- AC voltage maximum load 250V, AC current 10A, DC voltage maximum load 30V, DC current 10A, output normally open or close
Last update on 2025-11-10 / Affiliate links / Images from Amazon Product Advertising API
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FAQ:
Q: How to power a 3-3v relay?
A: Usually, you’re ging to power the 3.3V device from something like 5V USB or 9V plug. These sources can often provide the power required to energize the coil of your relay. You will have to make the control signal of your board and switch the “input power” over the coil of your relay.
Q: What power source do I need for a relay?
A: Check the specs to find one that fits your needs. Usually, you’re ging to power the 3.3V device from something like 5V USB or 9V plug. These sources can often provide the power required to energize the coil of your relay. You will have to make the control signal of your board and switch the “input power” over the coil of your relay.
Q: How does a 220U relay work?
A: The 220u charges via the 2k2 and bottom diode. When an input above 1.5v is applied to the input of the circuit, both transistors are turned ON and the 5v across the electrolytic causes the negative end of the electro to go below the 0v rail by about 4.5v and this puts about 10v across the relay. ”
Q: Can I use a relay for low voltage?
A: You can choose a relay that can work with low voltage/low current. Your best bet would be a “solid state relay”, since these do not require a coil to be energized and may work on low voltage/current. Check the specs to find one that fits your needs.