The USB Isolator Industry 4 kV from Wiesemann & Theis reliably protects USB connections against equalizing currents and electromagnetic interference. With an isolation voltage of at least 4 kV DC, it galvanically separates the USB host and connected device to ensure maximum signal quality and device safety.

It supports Low-Speed (1.5 Mbit/s) and Full-Speed (12 Mbit/s) USB devices—ideal for data acquisition, control engineering, medical technology, and high-quality USB audio equipment. The multi-stage filtered output voltage minimizes interference on the isolated side, making the device particularly well-suited for use with studio microphones or audio interfaces.

Galvanic isolation – protection for sensitive applications

In USB connections, equalizing currents can distort measurement accuracy, damage electronic devices, or compromise safety in medical systems. By galvanically isolating the upstream port (USB Type B plug) from the downstream port (USB Type A socket), the USB Isolator eliminates these risks completely.

A key feature is the L-C filtering of the output voltage on the isolated side, which effectively reduces high-frequency interference. This is especially beneficial for USB audio applications, where maximum signal purity is essential.

Interfaces and design

The isolator provides:

• Upstream port: USB Type B plug (host side)
• Downstream port: USB Type A socket (device side)

The 4 kV DC galvanic isolation ensures strong protection against electrical influences. Integrated into a USB cable with a DIN rail-compatible housing, the isolator can be installed compactly and securely in industrial control cabinets.

Power supply for high-consumption devices

Power is normally supplied via the USB bus. For devices requiring more power, the isolator includes an optional external power input supplying up to 1 A via a screw terminal while maintaining complete galvanic isolation. This ensures that neither isolation integrity nor safety is compromised.

This feature is particularly important for:

• External sensors with additional functions
• Audio interfaces requiring phantom power
• Medical USB devices with higher current consumption

Transparent operation

The isolator operates fully driver-free under Windows, macOS, and Linux. Devices are automatically detected without any configuration effort, and USB communication remains unchanged—only galvanically isolated and filtered.

Supported speeds:

• Low-Speed (1.5 Mbit/s)
• Full-Speed (12 Mbit/s)

For applications requiring high-speed data rates, the USB Isolator Hi-Speed (#33003) is recommended.

Standards compliance and robustness

Standards:

• EN 61000-6-2 – Immunity
• EN 55032:2015 + A1 Class B – Emissions
• EN 61000-3-2 / EN 61000-3-3 – Power compatibility

The device is designed for continuous operation. CE and UL certifications confirm its safe use worldwide. Wiesemann & Theis provides a five-year warranty.

Typical applications

• Data acquisition: interference-free connection of precision sensors via USB.
• Medical technology: safe interface between diagnostic devices and IT systems.
• USB audio: optimized connection of studio microphones or interfaces through filtered power supply.
• Control engineering: galvanic isolation between USB control units and host PCs.

Advantages of DIN rail mounting

The DIN rail-optimized design is ideal for use in:

• Industrial control cabinets
• Technical control centers
• Audio racks with fixed installations

Maximum safety and signal quality for USB

The USB Isolator Industry 4 kV from Wiesemann & Theis delivers exceptional isolation and filtering performance for Low- and Full-Speed USB devices. Combining galvanic separation, L-C filtered voltage, optional external power, and industrial DIN rail mounting, it is the ideal choice for professional applications where signal quality and safety are top priorities.