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Common Components/Features


Tripp Lite’s Isobar and American Power Conversion’s (APC) SurgeArrest are two leading surge protector products. When selecting a surge protector, look for these components and features:


Active Protection Light When this light is illuminated, the unit is properly functioning. It should be on at all times.


Site Wiring Fault Light When this light is illuminated, there is a wiring fault in the circuit to which the surge protector is connected. This light should be off at all times.


Ground Make sure that the unit has three prongs on the plug, the third, middle plug, being for ground. If the ground is missing, the user can receive a lethal shock. This may seem obvious, but it is important to remember.


IEEE 587 A Let-Through Rating Check the value of the IEEE 587 A Let-Through rating. This value indicates how much voltage is let through when the surge protector clamps down on the incoming spike or surge. The lower this rating, the lower the voltage that is let through and the better you are protected. A 330V rating is excellent protection.


UL Listing Underwriters Laboratories Inc. is an independent testing laboratory that certifies electrical equipment specifications. A UL listing indicates that the surge protector meets national electrical code and safety standards.


Circuit Breaker This button pops out after a large spike or surge. When the circuit breaker trips, you will lose all power to your equipment. Press the button back in to reset the surge protector.


Additional Ports New protectors protect much more than power cables. Today’s surge protectors have RJ-45 and coaxial connectors for protecting network cards from extremely high surges. Also, RJ-11 and ISDN ports protect modems from telephone pole lightning strikes (which can follow the phone line right into the modem, thus damaging it).

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