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Diamond Point International

B&B USB Isolators

High Retention USB Connectors, Wide Operating Temperature, 2/4 kV Isolation


The UH401 family of USB Port Isolators is available in 4 kV or 2 kV versions. They are used to protect your expensive equipment from dangerous ground loops and to help ensure data integrity in electrically noisy environments.  The high retention USB connectors hold standard USB cables tight, requiring a minimum of 3.2 lbs.-force to disconnect them. These in-line devices come in several variations, including versions with 4 kV and 2 kV protection, Full Speed (12 Mbps) USB, and Low Speed (1.5 Mbps) USB. As with our other isolators, protection for High Speed (480 Mbps) is not supported due to industry wide limitations.


This product comes in several variations to fit your specific application. The UH401 and UH401SL provide 4 kV isolation. The only difference being that the UH401SL is made for Low Speed USB (1.5 Mbps). Similarly, the UH401-2KV and UH401SL-2KV provide 2 kV isolation at Full and Low speed. High Speed (480 Mbps) is not supported.

Since these are USB Port Powered devices, they will provide 100 mA of power to downstream devices. If you need a full 500 mA of downstream power, select our rugged UHR401 or UHR402 USB Port Isolators. A USB Cable is included. 



InterfaceUSB 1.1, 12 Mbps (UH401 & UH401-2KV) or 1.5 Mbps (UH401SL & UH401SL-2KV)
USB Ports: High Retention USB Type B (Upstream) , Type A (Downstream), Minimum withdrawal force of 15 Newtons (~3.4 lbs-force)
LED Indicators: Power from USB bus
Isolation UH401-2KV: 2KV
Isolation UH401SL-2KV: 2KV
Isolation UH401: 4KV
Isolation UH401SL: 4KV


ElectricalInput Voltage: Standard USB bus power (5VDC)
Downstream Power: Provided Up to 100mA with full power upstream connection
Mechanical4.32 x 5.08 x 2.03 cm (1.7 x 2.0 x 0.8 in)
IP30 plastic case
SoftwareNote: These devices are transparent to the operating system, require no software drivers and will not be enumerated in device manager.
TemperatureTemperature range (operation): -40 to +80°C
Temperature range (storage): -40 to +85°C
Humidity0 to 95% Non-condensing
MTBF1,049,851 hours
Safety/CertificationEN61000-6-2:2005 (Heavy Industry)
EN61000-4-2:2008 (ESD +/-8kV Contact, +/-15kV Air
EN61000-4-3:2006 (RI) 10V/m, 80-1000MHz; 3V/m, 1.3 to 2.7 GHz
EN61000-4-4:2004 (EFT Burst) +/-2kV DC ports; +/-1kV signal ports
EN61000-4-5:2005 (Surge) +/-500V DC ports ; +/-1kV signal ports
EN61000-4-6:2005 (CI) 10Vrms, 0.15 to 80 MHz
EN61000-4-8:2001 (Magnetic) 10A/m, 50Hz & 60Hz
EMCFCC Class A, CISPR Class A (EN55022)

Ordering Details

BoardUH401 USB To USB 1 Port Isolator - 4Kv
UH401-2KV USB To USB 1 Port Isolator - 2Kv
UH401SL USB To USB 1 Port Isolator - 4Kv, Low Speed
UH401SL-2KV USB To USB 1 Port Isolator - 2Kv, Low Speed
AccessoriesUSBAMBM-15F Type A Male To Type B Male 15 Foot
USBAMBM-3F Type A Male to Type B Male, 3 foot (Grey)
USBAMBM-6F Type A Male to Type B Male, 6 Foot (Grey)
Order Online B&B USB Isolators - Order Online