Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant's customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. As an Amazon Associate we may earn from qualifying purchases. We may receive a commission from purchases made through links on our site, which will help us continue to provide you with value.
Best Choice ECSiNG 
ECSiNG 10PCS 5-Pin Terminals 5VDC Power Relay PC Board Relay for Industrial Control Automotive Electronics Safety System Premium Quality and Sealed Design: Constructed from high-quality materials, this relay features a waterproof and dustproBest Value Homyl 
HOMYL DC 12V 8-Channel USB Relay Module – PC-Controlled HID Relay Board for Home Automation Device Switching [Multi-Channel Relay Board] Equipped with 8 relays SRD-05VDC-SL-C, allowing control of multiple circuits through a singlMingzhe 
USB Relay Module High Performance MCU PC USB Smart Control Switch Jog Self Locking [High-performance Microcontroller Chips] - Equipped with onboard high-performance microcontroller chips for efficient anCHENBO 
4 pcs DC 5V 1 Channel Relay Module Board Shield High/Low Level Trigger with Optocoupler for Arduino The module uses genuine quality relay, normally open interfacesOVAQUIXI 
OVAQUIXI DC 36V USB Control Switch Relay Module Easy-to-Use PC Relay Module Expansion Board for Precise Computer Control [PLUG-AND-PLAY DESIGN] Enjoy a hassle- setup with the onboard control chip for easy use and convenience.ECSiNG ECSiNG SRD-05VDC-SL-C 5-Pin Terminals 5 VDC Power Relay PC Board Relay for Industrial Control Automotive Electronics Sec PREMIUM QUALITY & SEALED DESIGN Made of high quality materials, this relay features a waterproof and dustproof seal thatLT Easiyl 
LT Easiyl 4 Pcs Circuit Board 2 Channel Optocoupler Isolation Board Module PC817 3.6-30V Fit for Sensors Actuators Power This product is a 2-channel isolation module based on PC817 optocoupler, which can achieve signal isolation transmissionECSiNG ECSiNG SRD-09VDC-SL-C 5-Pin Terminals 9 VDC Power Relay PC Board Relay for Industrial Control Automotive Electronics Sec PREMIUM QUALITY & SEALED DESIGN Made of high quality materials, this relay features a waterproof and dustproof seal thatFafeicy PWM Driver Module 4 Wire PCB Wide Voltage Temperature Controller Relay Switch Board with Probe 12V for PC Fan SPECIFICATION: The working temperature of this temperature detection control module is in ‑25℃‑85℃, the working humidityKBOLAE 40A 5 Pin SPDT PCB Board Mount Relay Socket Connector for Terminals PCB Relay Sockets with built in 5pin Terminals.JBtek JBtek 4 Channel DC 5V Relay Module for Arduino Raspberry Pi DSP AVR PIC ARM Equiped with high-current relay, AC250V 10A ; DC30V 10AQezodsx Qezodsx One Channel Relay - Development Board Single Relay Module DC 7-60V Power Supply for Home Appliance Accessories 1. On-board and stable --32E module, capacity 4M Flash;AOICRIE AOICRIE 5Pcs DC 12V 1 Channel Relay Module Board Shield with Optocoupler Isolation Support High or Low Level Compatible This Relay Board Maximum load: AC 250V/10A, DC 30V/10A With power and relay action indicator.each relay has normally opeTiiyee 4 Channel Optocoupler Relay Module, Board High and Low Trigger Module with Isolation Support High/Low Level for Automati High and Low Level Controllable: Optocoupler relay module with a jumper cap, you can choose a low level control or a higEjoyous Ejoyous Berm Relay Module Board PC Flame Retardant Relay Module G6B 4BND DC 24V Coil 5A Sealed Output with Zero Turn On [Model Fit]Relay Module Board model G6B 4BND with DC 24V coil and DC working voltage. Suitable for replacing an old or dCasalytics G8P-1A4P Fully-Sealed PCB Relay (Set of 2) 12VDC 30A - 4Pins 30A 250VAC Relay for PC Board or Panel-Mounted Applications Fully-Sealed PCB Relay: The G8P-1A4P relay is fully-sealed, providing excellent protection against dust, moisture, and oSG Store SG Store 10pcs PCB Relay Socket 40A 5Pin Connector Suitable for Plug-in Relay Control Circuit Product size: The product is 27mm long, 24mm wide and 14.5mm wide. Manual measurements, please allow slight errors.Xiuxin Xiuxin 2pcs 5V 8 Channel Relay Module Board for Arduino PIC AVR DSP ARM 2pcs/lot 8 Channel relay module board, Working voltage: 5VYjcnelcr Yjcnelcr 4 Channel 5V 12V 24V Relay Board USB Connection Intelligent Home Relay Controller for PC Automation Projects Our 4-Channel 5V 12V 24V USB Control Switching Relay Module allows for seamless automation. Equipped with stable on-boarNOYITO NOYITO 2-Channel Micro USB Relay Module USB Smart Control Switch USB Intelligent Control Switch (2-Channel Micro USB) NOYITO 2-Channel Micro USB Relay Module is equipped with a stable USB to serial port chip and a microcontroller. It canYjcnelcr Yjcnelcr 4 Channel 5V 12V 24V Relay Board USB Connection Intelligent Home Relay Controller for PC Automation Projects Our 4-Channel 5V 12V 24V USB Control Switching Relay Module allows for seamless automation. Equipped with stable on-boarYjcnelcr Yjcnelcr 4 Channel 5V 12V 24V Relay Board USB Connection Intelligent Home Relay Controller for PC Automation Projects Our 4-Channel 5V 12V 24V USB Control Switching Relay Module allows for seamless automation. Equipped with stable on-boarDWEII DWEII 5pcs 5V 2 Channel 5V Relay Module with Optocoupler Low Level Trigger Expansion Board Compatible with R3 MEGA 2560 Standard interface that can be controlled directly by microcontroller (Compatible with Arduino, 8051, AVR, PIC, DSP, ARMQIEIEI QIEIEI ULN2803 5V 12V 24V 4CH USB Control Relay Module Smart Switching for PC Automation and Expansion Board Hassle-free automation with our 4 Channel 5V 12V 24V USB Control Switching Relay Module. Features stable USB and high coKUNLONGSKY AC 220V/DC 5-30V Power Supply WiFi Bluetooth BLE Four-Way Relay Module - Development Board 1/O Port 2: Onboard and stable --32E module, large-capacity 4M FlashMiZOELEC 5V 2-CH 2 Channel RS232 Serial Control Relay Switch Board SCM PC Relays 5V 2-CH 2 Channel RS232 Serial Control Relay Switch Board SCM PC RelaysQIEIEI QIEI 4 Channel USB Control Relay Module ULN2803 5V 12V 24V Intelligent Switching for PC Automation and Expansion Board Seamlessly automate with our 4 channel 5V 12V 24V USB control switch relay module. Stable onboard USB and high control cDiyeeni Diyeeni USB Switch Module, 2-Channel 5V Computer USB Smart Switch Controller, PC Relay Drive Module Expansion Board, Rel Onboard USB interface, stable connection.Podazz Podazz 5Pcs DC 1-Channel Optocoupler 3V/3.3V Relay High Level Driver Module, Isolated Driver Controller Board for Arduin 【Product Parameters】30VDC 250VAC load with high current relays, AC250V 10A ; DC30V 10A, each relay has normally open andDWEII DWEII 10 PCS 2 Channel DC 5V Relay Module with Optocoupler Low Level Trigger Expansion Board Compatible with Arduino R3 5V 2-Channel Relay interface board, and each one needs 15-20mA Driver CurrentSnblzhef Snblzhef DC 12V 4 Channel RS232 Relay Board PC USB DB9 Interface Relay Module Serial Port Remote Control Switch for Moto Four-channel serial relay:Denash Denash 2 Pcs Timer Relay Module, Infinite Cycle Delay Switch Board 1s to 15 Mins, with Microcontroller, for Machine Test DUAL OPERATION MODES FOR VERSATILE CONTROL: Easily switch between single and cycle modes by adjusting the jumper. In sinSnblzhef Snblzhef DC 12V 4 Channel RS232 Relay Board PC USB DB9 Interface Relay Module Serial Port Remote Control Switch for Moto Four-channel serial relay:WMYCONGCONG WMYCONGCONG 5 PCS 2 Channel 12V Relay Module with Optocoupler Low Level Trigger Expansion Board Compatible with Raspberr 12V 2 channel relay module, can be controlled by any 12V digital output from your microcontroller.Jelquix Jelquix USB Smart Relay Controller Module for PC, Grade 5V 2-Channel PC Relay Drive Board for XP 32/64-bit System [HIGH PERFORMANCE USB CONTROL CHIP] Utilizes an imported high-performance USB control chip for reliable performance.Sorandy Sorandy USB Control 2NO 2NC Relay Module, Plug and Play, Automatic Operation, 0.5A Max Switching Current, Smart Home PC MULTIFUNCTIONAL: The LCUS drive- USB computer drive- control switch relay module is an efficient and intelligent controlYOUMILE Youmile RC Snubber/Absorption Circuit Module, Relay Contact Protection Relay Thyristor Resistance Surge Thyristor, DC 5- Applicable Load: Suitable for AC or DC 5-400V inductive load (load less than 1000W) to protect relay contacts or thyristLrocaoai 2X 8Ch Input/Output Digital Switch TTL LvTTL CMOS RS485 IO Control Module Modbus Rtu Board for PLC Relay(with Terminal) 1 Working voltage: DC 12V (6-24V)Reland Sun 4-Way 5V Relay Module Control Expansion Board Standard shield interfaces and shapes.Spacnana Spacnana USB Relay Module 2 Channel 5V Relay Board 2CH USB Controlled Module with High Performance Control Chip for Comp [EFFORTLESS PLUG & PLAY CONTROL] This USB controlled relay module eliminates complicated driver installations. UtilizingLrocaoai USB Relay Module USB Intelligent Control Switch USB Switch for LCUS-1 Type Electronic Converter LC USB Switch Communication Protocol:T TOOYFUL USB Eight Channel 8 Relay Switch Output Module Board PC Computer Controller Using /OFF switching electrical devices for , , solenoids etc.YDuupxe YDuupxe USB Control Switch, 2 Channel Relay Module with PCB Board, for XP 32 Bit Computer PC Intelligent Control (USB Sw [Plug and Play Technology] No need for additional drivers—compatible with systems out of the box. simply connect via thePodazz 5 PCS 1 Channel Relay Module with Optocoupler Relay Control Board Low Level Trigger Relay Shield Module Indicator Light 【High Performance Isolation】 Podazz 5V relay module features advanced patch photocoupler isolation, ensuring strong drivClisted Clisted 1 PCS Relay Module Board with Optocoupler Self-Locking Timing Relay DC 8V-36V 4 Channel 3. DC 8V-36V wide voltage input, with power supply anti-reverse connection function, not damage the module due to wrongeletechsup DC 12V 24V 2Ch DB9 UART Relay Module RS232 Serial Port Switch Board for PC PLC Motor LED PTZ (12V) Brand Name : eletechsupeletechsup DC 12V 24V 2Ch DB9 UART Relay Module RS232 Serial Port Switch Board for PC PLC Motor LED PTZ (24V) Brand Name : eletechsupOdorkle Odorkle 4 Channel Relay Module, 5V 4 Channel Relay Module, 5V PC Control Switch Expansion Board USB with Overcurrent EQUIPPED WITH CHIP AND CONTROLLER:4 channel micro USB relay module has stable USB to serial port chip and microcontrolleSorandy DC 36V USB Control Switch, Relay Module Drive, Computer PC Control, Relay Module Expansion Board, WiFi Wireless Smart Sw MULTIFUNCTIONAL: Support for a variety of operating systems and programming languages, a wide range of applications, higTIKATARER TIKATARER 2 Channel USB Relay Module Intelligent Control Switch for PC Computer, Sport Equipment PCB Board Production fo 【EASY TO USE】No driver installation required for system, thanks to technology. Simply plug in the USB control switch andLiyeehao MCU PC USB Control Relay Board, High-Performance Microcontroller Chips USB Control Relay Module, for Home Industry 100% brand new and high quality.MiZOELEC 1Pcs DC 5V 10A 8 Channel Micro USB Relay Indicator Board Module PC Upper Computer ICSE014A Software Control 1Pcs DC 5V 10A 8 Channel Micro USB Relay Indicator Board Module PC Upper Computer ICSE014A Software ControlDcnhfdsw Dcnhfdsw DC 12V 4 Channel RS232 Relay Board PC USB DB9 Interface Relay Module Serial Port Remote Control Switch for Moto 2. Standby current (all relays closed) 18MA, 1-way relay "open" 50MA, 2-way relay "open" 81MA, 3-way relay "open" 110MA,OVAQUIXI OVAQUIXI USB Control Switch Relay Module Plug and Play PC Control Relay Module Expansion Board for Reliable Electrical C [SIMPLE AND EFFICIENT] Utilize the USB Control Switch Relay Module effortlessly with its drive- operation and plug-and-pCocoarm Cocoarm DC 5V USB Relay Module 4 Channel Relay Board PCB Control Switch High Performance Chip Serial Port Command Operat [4 Channel Control]This USB relay module provides 4 independent relay channels with DC 5V working voltage. It supports cChangor Changor 433MHz RF Remote Control Switch Mini PCB Transmitter Receiver Superheterodyne Module Stable Signal RF Transmitte [Through Obstacles] Experience reliable control through walls, floors, and doors with a maximum range of up to 100 meterEosnow Eosnow 4 Channel 5V Computer USB Control Switch Relay Module, USB Relay Board with Drive Free Control Chip, for PC Intel PROTECTION FUNCTION:USB Relay Module includes built-in overcurrent protection and relay diode freewheeling protection, eDcnhfdsw Dcnhfdsw 8 CH RS232 Relay Board PC USB UART DB9 Remote Control Switch for PLC Smart Home Garage Door Car Farm Motor for Standby current 16MA.Domary 4 Channel Relay Module 5V USB Expansion Board for PC Control Switch [User-friendly Design] With the ability to control the opening and closing of the relays using serial debugging softwareHiSport HiSport T9AS1D12-12 Power Relay 12VDC 30A SPST-NO PCB Compatible with PC Board or Panel-Mounted Applications High-Capacity Power Relay: Handles demanding loads up to 30A @ 240VAC with a 12VDC coil, featuring a reliable SPST-NO (SEujgoov Eujgoov Audio Input Switch Module, Compact Relay Switch Board, 4 Way Audio Selector for Home Theater, PC and TV [Four Inputs and One Output] Supports switching between four audio sources to one output seamlessly.elechawk I2C Qwiic Cable Kit Stemma QT Wire for SparkFun Development Boards Sensor Board Breakout Breadboard 4 Pin Sh1.0 Connecto Includes 12 pcs cables of various lengths and styles (10cm,20cm, 30cm, 50cm. SH1.0 connector and breadboard Jumper and FEujgoov 2 Channel DC Relay Module Relay Switch Board, Serial Relay Switch Relay to RS232,2 Channel Relay Switch Module Serial Po Stable and :The relay switch board with capacitor filter circuit, which has improved stability.Diitao Diitao 6PCS 2 Channel DC5V Relay Module with Optocoupler Low Level Trigger Expansion Board for Arduino R3 MEGA 2560 1280 1Aumotop Aumotop Drive Free USB Relay Expansion Board, 4 Channel Relay Module with Serial Control, Stable Controller, Long Servic [PLUG-AND-PLAY SETUP] Onboard control chip for hassle-free installation and useRIZGHWOY RIZGHWOY USB Control Switch Relay Module Efficient Computer PC Control Relay Module Expansion Board for High Precision E [DRIVE- OPERATION] The USB Control Switch Relay Module features an onboard control chip, making it plug and play with noWlpdkptg Wlpdkptg DC 12V 4 Channel RS232 Relay Board PC USB DB9 Interface Relay Module Serial Port Remote Control Switch for Moto 2. Standby current (all relays closed) 18MA, 1-way relay "open" 50MA, 2-way relay "open" 81MA, 3-way relay "open" 110MA,Dcnhfdsw Dcnhfdsw DC 12V 4 Channel RS232 Relay Board PC USB DB9 Interface Relay Module Serial Port Remote Control Switch for Moto 2. Standby current (all relays closed) 18MA, 1-way relay "open" 50MA, 2-way relay "open" 81MA, 3-way relay "open" 110MA,Annadue Annadue Relay Module Relay Switch, 2 Channel 5V Computer Usb Smart Switch Controller Pc Relay Drive Module Expansion Boa Onboard square USB interface, stable connection.Generic 4 Channel USB Control Relays Module ULN2803 5V 12V 24V Intelligent Switching for PC Automation and Expansion Board seamlessly automation with our 4 Channel 5V 12V 24V USB Control Switching Relays ModuleFeatures stable onboards USB andGeneric 4 Channel USB Control Relays Module ULN2803 5V 12V 24V Intelligent Switching for PC Automation and Expansion Board seamlessly automation with our 4 Channel 5V 12V 24V USB Control Switching Relays ModuleFeatures stable onboards USB andGeneric 4 Channel USB Control Relays Module ULN2803 5V 12V 24V Intelligent Switching for PC Automation and Expansion Board seamlessly automation with our 4 Channel 5V 12V 24V USB Control Switching Relays ModuleFeatures stable onboards USB andJESSINIE JESSINIE 2Pcs 1 Channel Switch Relay Module Modbus Rtu Switching Input Output Relays Board with Anti-Reverse Connection On-board mature and stable 8bit MCU and MAX485 level conversion chipsSpacnana USB Relay Module, Smart Control Switch Self-Locking Jog with USB CH340, Circuit Board for PC MCU [High Performance Microcontroller Chips] Ensure smooth and efficient operation of the relay module.Generic Chassis Fan Hubs - 1 to 10Pin PC Fan Splitter | PC Case Fan Cable Control, PWMs Controller Splitter, Motherboard Cooler τ 【Expansion Interface】PWMs Fan Hubs help to solve the problem of insufficient motherboard interface by extending the 4-Dorhea Dorhea ESP8266 ESP-12F NodeMcu D1 Module WeMos Lua 4M Bytes WLAN WiFi Internet Development Board + Relay Shield + 2.54mm The esp8266 module is 11 digital input / output pins, all pins with interrupt / PWM / I2C / support 1 line (except D0);sb components SB Components Ardi Relay HAT for UNO R3 Development Board Relay Shield Expansion for Arduino Uno, Mega, ArdiPi & Ardi32 The Ardi Relay Shield is a versatile 4-channel optoisolated relay board that enhances your Arduino projects, allowing yoYIGZYCN YIGZYCN Channel USB Control Relay Module ULN2803 5V 12V 24V Intelligent Switching for PC Automation and Expansion Board Our 4 Channel 5V 12V 24V USB Control Switching Relay Module allows for seamless automation. Stable on-board USB and advaHDPQNHWA 8DI-8DO Industrial-Grade Multi-Function USB Relay Board PC UART COM Switch Module with Input Indicator Light DC 12V 24V( ApplicationsYIGZYCN YIGZYCN Channel USB Control Relay Module ULN2803 5V 12V 24V Intelligent Switching for PC Automation and Expansion Board Our 4 Channel 5V 12V 24V USB Control Switching Relay Module allows for seamless automation. Stable on-board USB and advaWaveshare Waveshare Quality 3-Ch Relay Expansion Board Designed for Jetson Nano Optocoupler Isolation Standard 40PIN GPIO header, directly pluggable onto the Jetson NanoYIGZYCN YIGZYCN Channel USB Control Relay Module ULN2803 5V 12V 24V Intelligent Switching for PC Automation and Expansion Board Our 4 Channel 5V 12V 24V USB Control Switching Relay Module allows for seamless automation. Stable on-board USB and advaPqredg Pqredg 8 CH RS232 Relay Board PC USB UART DB9 Remote Control Switch for PLC Smart Home Garage Door Car Farm Motor Standby current 16MA.Dcnhfdsw Dcnhfdsw DC 12V 8 CH RS232 Relay Board PC USB UART DB9 Remote Control Switch for PLC Smart Home Garage Door Car Alarm Fa DC 12V power supply (voltage range 9-13V).HDPQNHWA 8DI-8DO Industrial-Grade Multi-Function USB Relay Board PC UART COM Switch Module with Input Indicator Light DC 12V 24V( ApplicationsSwpeet Swpeet 450Pcs Computer Screws Motherboard Standoffs Assortment Kit for Mainboard, Hard Drive, Fan, Power Supply DIY PC I 💯 【 What You Get 】------ In this kit, You will get 450Pcs Computer Screws Motherboard Standoffs Screws Assortment Kit,Ganbui Ganbui 8 CH RS232 Relay Board PC USB UART DB9 Remote Control Switch for PLC Smart Home Garage Door Car Farm Motor RS232 DB9 female interface.Dcnhfdsw Dcnhfdsw 8 CH RS232 Relay Board PC USB UART DB9 Remote Control Switch for PLC Smart Home Garage Door Car Farm Motor for Read, open, close, self-lock, inching, interlock 6 instructions, can meet most industrial control occasions.Dcnhfdsw Dcnhfdsw 2X DC 12V 4 Channel RS232 Relay Board PC USB DB9 Interface Relay Module Serial Port Remote Control Switch 3. RS232 DB9 female interfaceDaXuTech Wireless Remote Switch,Smart Home 433Mhz DC 12V 1CH Wireless Remote Switch Relay Receiver Transmitter Universal Remote C 💡-Very convenient to use, simple wiring diagram connection way.JTKOKI 12V 4 Channel RS232 Relay Board PC USB UART DB9 Interface Relay Module Serial Port Remote Control Switch for Motor Garag GeneratorsDcnhfdsw Dcnhfdsw 8 CH RS232 Relay Board PC USB UART DB9 Remote Control Switch for PLC Smart Home Garage Door Car Farm Motor for Relay load voltage: DC 1-100V or AC85-265V.JTKOKI 12V 4 Channel RS232 Relay Board PC USB UART DB9 Interface Relay Module Serial Port Remote Control Switch for Motor Garag GeneratorsLmrysalque Lmrysalque 5Pcs Relay Module Driver Free 1 Channel Control Switch Controller Board for PC Computer 5V Better Control: Comes with stable USB to serial port chip and micro controller to control the 1 channel relay on and offMingzhe 8-Channel 12VDC Type B USB Relay Board Module Controller Automation Robotics for Robotics Labs [Efficient Relay Control] When connected to a pc and restarted, the relays toggle multiple times due to the ftdi chip'sJeffergarden Jeffergarden USB Relay Controller, 8 Channel Programmable Board, 12V with Easy PC Control for Home Automation and Roboti Simple USB Control: Connects easily to a PC with no drivers required, ideal for controlling various electrical devices dWlpdkptg Wlpdkptg 8 CH RS232 Relay Board PC USB UART DB9 Remote Control Switch for PLC Smart Home Garage Door Car Farm Motor RS232 DB9 female interface.DaXuTech Wireless Remote Switch,Smart Home 433Mhz DC 12V 1CH Wireless Remote Switch Relay Receiver Transmitter Universal Remote C 💡-Very convenient to use, simple wiring diagram connection way.MHCOZY MHCOZY 1 Channel USB 5V AC/DC 7-32V Smart WiFi Wireless Dry Contact Relay Switch Module,Tuya Smart Life app Remote Contr WIFI app remote,Works with tuya/smart life app,doesn't support ewelink app easy to setup with low voltage 5V 12V 32V,dry