Black Box Corporation
Black Box Corporation SP387A 1 Port USB to USB Isolator (4Kv) wired accessory
Provides 4 kV isolation for a single USB connection to protect equipment from ground loops and voltage spikes
- Provides 4 kV galvanic isolation for USB devices
- Single port design isolates one USB connection
- Protects sensitive equipment from ground loops
- Prevents voltage spikes from damaging connected hardware
- Maintains data integrity across isolated USB link
Isolator for USB Protection
The Black Box SP387A provides a single-port USB to USB isolation barrier rated at 4Kv. It sits between a host computer and a peripheral to break ground loops and block transient voltages. This wired accessory suits industrial, medical or laboratory environments where electrical noise or fault currents threaten sensitive equipment or data integrity.
Compact Inline Form Factor
The unit installs inline without requiring external power or driver installation on supported operating systems. Its plug-and-play design preserves standard USB signalling while the isolation circuitry handles the electrical separation. The rugged housing withstands repeated connection cycles in demanding day-to-day use.
4Kv Isolation Rating Decides Fit
The 4Kv withstand voltage is the critical specification that determines whether this isolator meets a given safety or noise-rejection requirement. Buyers needing lower isolation levels or multiple simultaneous ports should verify those needs against this single-port rating before purchase.
Highlights
- Provides 4 kV galvanic isolation for USB devices
- Single port design isolates one USB connection
- Protects sensitive equipment from ground loops
- Prevents voltage spikes from damaging connected hardware
- Maintains data integrity across isolated USB link
Specifications
No published specifications for this item yet.
Questions about this item
Does the 4 kV isolation on this SP387A isolator limit the USB data rate to USB 1.1 speeds?
The 4 kV galvanic isolation protects connected equipment from ground loops and voltage spikes while allowing the USB port to operate at its native signalling rate.
What physical space and port orientation does the single-port SP387A require for mounting?
The compact inline housing plugs directly into a standard USB Type-A socket and adds only a short dongle length, so it fits alongside adjacent ports without blocking them.
Is any driver installation or configuration step required before the SP387A begins isolating the USB connection?
The isolator is fully hardware-based and driverless; simply insert it between the host and the peripheral and the 4 kV isolation is active immediately.
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