USB Powered & Plug-and-Play: Connect directly to any USB port—no extra power supply required—for instant 4-channel relay control on Windows and Mac. Reliable Serial Interface: Features Silicon Labs CP2102 chipset; install driver once to create a virtual COM port for stable, high-speed communication. Simple AT Command & Python Integration:Control each relay with ASCII-formatted AT commands; sample Python scripts included to jump-start your automation projects. Wide Voltage Range & High Load Capacity：Safely switch AC 110–250 V or DC up to 30 V; supports up to 600 W per channel for industrial and home automation.
1, Support File
2, Datasheet
4, Software and Tools
SH-UR04A is a 4-channel USB-powered relay module for Windows and Mac. Featuring the CP2102 chipset, it offers stable serial communication, AT command and Python control, and supports AC/DC loads up to 600W per channel—ideal for automation in industrial or home projects.
Specification
Model：SH-UR04A
Main Chip：Silicon Labs CP2102-GMR
Interface：USB/Serial port
USB Standard：USB 2.0; compatible with USB 1.1
Connectors：USB Type C, 3 PIN Terminal Block X4
Pin Definition：(COM; NO; NC)X4
Maximum Load Power：600W
Switching Voltage：AC 110V-250V; DC 30V
Default UART Settings：9600 baud; 8 data bits; 1 stop bit; no parity
List of supported systems
1, Windows XP, 7,8,10,11
2, Ubuntu 11.10, Kernel 3.0.0-19
3, Mac OS X 10.3 to 10.8 (32 and 64 bit).
4, Mac OS X 10.9 and above (64 bit).
Packing list
1 X SH-UR04A USB Relay controller
1 X USB-C extension cable(1M/3.2FT)
1 X User Manual
1, Support File
2, Datasheet
4, Software and Tools
SH-UR04A is a 4-channel USB-powered relay module for Windows and Mac. Featuring the CP2102 chipset, it offers stable serial communication, AT command and Python control, and supports AC/DC loads up to 600W per channel—ideal for automation in industrial or home projects.
Specification
Model：SH-UR04A
Main Chip：Silicon Labs CP2102-GMR
Interface：USB/Serial port
USB Standard：USB 2.0; compatible with USB 1.1
Connectors：USB Type C, 3 PIN Terminal Block X4
Pin Definition：(COM; NO; NC)X4
Maximum Load Power：600W
Switching Voltage：AC 110V-250V; DC 30V
Default UART Settings：9600 baud; 8 data bits; 1 stop bit; no parity
List of supported systems
1, Windows XP, 7,8,10,11
2, Ubuntu 11.10, Kernel 3.0.0-19
3, Mac OS X 10.3 to 10.8 (32 and 64 bit).
4, Mac OS X 10.9 and above (64 bit).
Packing list
1 X SH-UR04A USB Relay controller
1 X USB-C extension cable(1M/3.2FT)
1 X User Manual
