Surge protectors, or surge suppressors, stop invisible voltage spikes from harming electronics or appliances in a home. One type connects to the electric panel near the circuit breaker, while the more common type are point of use surge protectors for computers, telephone, printers, etc. These surge protectors can wear out, so be sure to replace them.

 Invisible disruptions in electrical power are real and they are becoming more of a threat to electronic equipment regardless of whether or not you live in a new home. A voltage surge or spike caused by a blown transformer, downed power lines, lightning, electric power grid switching, etc. doesn't discriminate between old and new houses. What's more, surges travel down telephone, cable, and TV antennae wires as well. That innocent telephone line connected to the back of your TV or computer can be the source of destruction in the blink of an eye.

 Well over 50 percent of the power surges your equipment will experience are created within your own home when appliances with large motors (air conditioners, refrigerators, freezers, washing machines, etc.) turn on and off. What's more, just about every electronic device manufactured today contains smaller and smaller micro-processing chips that are more sensitive to voltage spikes than ever before. You need surge protection and lots of it if you want to protect your computers, printers, fax machines, garage door openers, stereos. etc.

 There are two basic types of residential or light commercial surge suppressors. One type connects to your electric panel where your circuit breaker or fuses are located. These devices are designed to stop harmful surges before they can travel towards the electronic equipment in your home. They are not DIY friendly. A professional, licensed electrician should install a whole house suppressor.

Most people are familiar with the point of use surge suppressor. These are the ones that contain multiple electrical outlets for your computer, printer, scanner, stereo receiver, CD player, etc. and often connection points for telephone and cable TV wires. These surge protection devices come in varying levels of quality and protection. If you purchase the wrong one, your brand new computer or stereo can become toast in less than a second.

Surge suppressors are like car brake disc pads. They wear out. Inside most suppressors you will find metal oxide varistors (MOVs). These electrical components are sacrificial. Small surges that enter your house slowly destroy the MOVs. A large surge can cause instantaneous destruction of all of the MOVs in an instant. The MOVs ability to block surges is measured in joules. Buy a surge suppressor that has a high joule rating. Look for ones that offer joule ratings of 1,900 or more if possible.

 Pay attention to clamping voltage as well. This rating tells you when the surge suppressor will react. High quality suppressors have low clamping voltages. If the equipment you are trying to protect contains micro-processing or computer chips, purchase a suppressor with a clamping voltage of 330 volts or LESS. Look for the Underwriters Laboratory (UL) UL-1449 voltage rating on the suppressor's packaging. This is the true measure of clamping voltage.

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