Amazon.com: GeeekPi Raspberry Pi Expansion Board 4 Channel Relay Board Module Power Relay Module for Raspberry Pi 4B & Raspberry Pi 3 Model B+ & Raspberry Pi 3/2 Model B (No Programming
SainSmart 4-Channel Relay Module + Free Shipping
Amazon.com: DC 12V RS485 4 Channel Relay Module with Optocoupler Protection, STM8S103F3 Relay Board Microcontroller Communication : Industrial & Scientific
Elegoo 4 Channel DC 5V Relay Module with Optocoupler for Arduino UNO R3 1280 DSP ARM PIC AVR STM32 Raspberry Pi: Amazon.de: Computer & Accessories
Amazon.com: PiRelay EXPANSION BOARD FOR RASPBERRY PI Raspberry Pi A+/B+/2B/3B/3B+ Loads up to 240VAC/7A,125VDC/10A by SB Components : Electronics
Amazon.com: DC 12V RS485 4 Channel Relay Module with Optocoupler Protection, STM8S103F3 Relay Board Microcontroller Communication : Industrial & Scientific
SainSmart 4-Channel Relay Module + Free Shipping
4 Channel Relay Module 1 SPDT DIN Rail Mount 12V 24V DC/AC Interface Relay Module for PLC FY-T734,24VACDC - - Amazon.com
kwmobile 3X 4 Kanal Relais Modul mit 5V für Arduino: Amazon.de: Baumarkt
4-Kanal-Relais-Modul, 5V Relay-Module mit Optokoppler, Status-LEDs für Arduino und Raspberry Pi : Amazon.de: Gewerbe, Industrie & Wissenschaft
NOYITO 4-Channel Relay Module DC 5V 12V 24V Self-Locking Triggering Interlocking High Low Level Trigger for PLC Industrial Control (12V): Amazon.com: Industrial & Scientific
Power Supply of a waterpump - Motors, Mechanics, Power and CNC - Arduino Forum
MakerFocus Raspberry Pi Expansion Board 4 Channel Relay Board Module Power Relay Module for Raspberry Pi 4B/3 Model B+/Raspberry Pi 3/2 Model B (No Programming Required/Programmable) : Electronics - Amazon.com