APC PSP25 ProtectNet Serial Parallel Port Surge Protector DB25 All 25 Lines

APC PSP25 ProtectNet Serial Parallel Port Surge Protector DB25 All 25 Lines

The APC PSP25 ProtectNet is an inline isolated loop circuit protector designed to safeguard serial and parallel port data lines from damaging voltage surges and transients. It installs directly between a computer's DB25 serial or parallel port and the connected peripheral, requiring no external power. All 25 signal lines are protected simultaneously.

Specifications & What's Included

• Model: PSP25
• Product Line: APC ProtectNet
• Description: Isolated Loop Circuit Protector
• Lines Protected: All 25
• Connector: DB25 (25-pin) Male on one side, DB25 Female on the other — installs inline
• Retention Hardware: Red thumbscrew retention posts on both connector ends
• Certification: UL Listed (13KA)
• Country of Manufacture: China
• Form Factor: Compact inline adapter — no external power required

Applications

The APC ProtectNet PSP25 protects data and signal lines on serial and parallel port connections — common on legacy computer peripherals including printers, plotters, scanners, external drives, and serial communication devices. Serial and parallel port surge protection of this type was widely used in office and light industrial environments through the 1990s and 2000s, where DB25 connectors were the standard interface for connecting PCs to printers and other peripherals. The isolated loop design prevents ground-loop-induced transients from damaging connected equipment. These devices remain useful wherever DB25 serial or parallel port connections are still in active service, including legacy industrial systems, CNC machine interfaces, and older test and measurement setups that rely on RS-232 or Centronics parallel communication.