Power 5VDC provided by USB cable. Optical Isolation 2500Vrms / 500VDC isolation.
eBay
CH318T 480Mbps USB 2.0 high-speed isolator 3kV Isolation protection Isolated USB HUB for PC HHD/Eliminate Ground Noise DAC/Audio
Aliexpress UK
Type:ADUM3160 Digital Signal Audio Power Isolator. free drive, it is more convenient to use. applies to all communications used by software, plug and play.
eBay
Industrial Grade Isolated USB to RS485 Converter – Serial Port Adapter with CH340 & CP2102 Chipset
Aliexpress UK
USB INLINE ROCKER SWITCH. The USB cable with switch. Interface A: USB female. Interface B: USB male. It can be used on Raspberry pi, as well as other similar application, like USB lamp, USB fan, etc.
eBay
Industrial Grade USB to RS232/485/422/TTL Isolated Converter with FT232RL USB-C to RS232 Serial cable with FTDI Chip
Aliexpress UK
1 Piece USB Isolator. Easy Installation: It can be easily operated, very convenient and safe to use, will not hurt hands. Small Size: Its compact size, smooth surface, no injury to the hands, it is very safe to use.
eBay
USB to RS232/485/TTL Interface Converter Industrial Isolated with Original FT232RL / CH343G TVS for Windows 10/8/7/XP
Aliexpress UK
The SH-G01L USB Isolator is built with ADI's ADUM3165 chip. 480M High Speed Isolator: Realizes passive isolation of high-speed 480M, full-speed 12M and low-speed 1.5M, effectively prevents ground noise, electrical interference, electrostatic breakdown and signal fluctuation.
eBay
Waveshare USB TO RS485 2CH Converter FT2232HL Grade Isolated Converter
Aliexpress UK
eBay
Its low power consumption design minimizes the overall energy footprint of the system, promoting both data integrity and energy efficiency. Audio Clarity and Isolation: Uniquely, the USB isolator supports audio signal isolation, preventing crosstalk and interference.
eBay
4 Channels ADUM3160.
eBay