Premium protection for your expensive electronics, network hardware and peripherals, the ISOTEL4ULTRA Isobar 4-Outlet Surge Protector features a network-grade surge protection rating of 3300 joules to defend your sensitive electronics against even the strongest surges and spikes. The ISOTEL4ULTRA features four NEMA 5-15R outlets, which are arranged in two exclusive isolated filter banks that prevent equipment connected to one bank from interacting with equipment connected to the other. These internal barriers also prevent disruptive line noise from causing A/V distortion, computer lock-ups, data errors and similar problems. Large toroidal chokes, ferrite rod-core inductors, HF/VHF capacitors and multiple layers of metal oxide varistors remove EMI/RFI interference and prevent system crashes, reboots and performance problems. A pair of RJ11 jacks also provides single phone line protection for modems, fax machines and cordless phones. Because residential power outlets have three wires, hot line (H), neutral (N) and ground (G), the ISOTEL4ULTRA protects all three, covering two protection modes: full normal mode (H-N) and common mode (N-G/H-G).Included safety covers protect against dust while blocking accidental contact with unused outlets. An integrated 12A circuit breaker protects all outlets and shuts down connected equipment in the event of an overload. A lighted on/off switch provides one-touch control over connected components. Diagnostic LEDs show power, protection and line fault status at a glance. A 6' (1.8m) power cord with right-angle 5-15P plug reaches nearby outlets and allows furniture to be placed flush against the wall.