Additional information about Surge Suppressors:
Surge suppressors or surge protectors are basically filters. They are designed to filter out power variations, including spikes and surges (or blooms).
The clamping speed rating for surge protectors shows the reaction time needed to stop or clamp a surge or spike. Normally rated in milliseconds.
The clamping voltage shows the rating for the maximum voltage that can safely be stopped or clamped. The higher the voltage, the better the device in terms of clamping voltage.
Surge suppressors only work on momentary power variations. For protection against data loss and equipment failure due to power loss, an Uninterruptible Power Supply (UPS) should be used. Surge suppressors only work on variations that are less than 0.5 seconds, on average.
Better surge protectors also have protection for items such as telephone lines and cable modems. Spikes and lightning strikes can enter your system from any point, including ground. The well-designed protector will block most of the damaging spikes.
When selecting a new surge suppressor, look for one that has a fast clamping rate, a high clamping voltage, an indicator to show when the unit is protecting your equipment, a light to indicate a good ground, extra space on the unit to accommodate power transformers (commonly called Wall Warts), and outlets for cable and telephones. Most importantly, select a suppressor that protects on all three lines - hot, neutral and ground.