In-Line Surge Protector Helps Keep Your Devices Safe. Ideal for security systems, trade shows, home theaters, computer workspaces and other network applications, this network surge suppressor protects connected equipment from damage caused by power surges and electrostatic discharge (ESD) that can enter equipment from the signal lines or chassis ground. Your Last Defense Against Intruding Voltage Spikes. Surge suppression ensures that connected devices, such as routers, switches, AV equipment, industrial controllers and telecom systems, remain shielded from power anomalies caused by lightning strikes, grid fluctuations or nearby equipment cycling. The result is enhanced uptime, reduced maintenance costs and longer equipment life.