Black Box Corporation DNHSP387A USB Isolator 4 kV USB 1.1 3.3 ft

Isolated USB 1.1 Link

This one-port isolator sits between a computer and a USB peripheral to break ground loops and block surges up to 4 kV. It draws power from the host port so no external supply is needed. The device targets medical, industrial and measurement environments where electrical noise or fault currents threaten data integrity and hardware safety.

Steady-State Isolation Behaviour

The barrier maintains its 4 kV rating continuously rather than only during brief transients, so long monitoring sessions stay protected. Because the link runs at USB 1.1 speeds, sustained throughput remains modest and suits low-bandwidth sensors or legacy equipment. No active cooling is required and the isolator adds negligible latency to the data path.

Compact Inline Form Factor

A 3.3 ft captive cable keeps the isolator close to the host while the small body fits behind crowded equipment racks or on crowded benches. Standard Type-A connectors at both ends mean no adapters are necessary for typical PC and peripheral ports. The plug-and-play design requires no drivers, so technicians can insert or remove the unit without reconfiguring software.