Sphere-Shaped 3-Outlet Surge Protector Safeguards Your Sensitive Electronics. Ideal for your home or office workstation or travel use, this Safe-IT™ power ball features a surge suppression rating of 540 joules to defend your sensitive electronic components against even the strongest power surges and spikes. Because residential power outlets have three wires—hot line (H), neutral (N) and ground (G)—the TLP38UAM protects all three, covering the two protection modes: full normal mode (H-N) and common mode (N-G/H-G).