How Many Amps?

7.5 Amps, 15 Amps, or 20 Amps?

If you are unsure about which size surge suppressor to purchase – a 7.5 Amp, 15 Amp, or 20 Amp model, you can follow these instructions:

  • Consult your product manual or equipment label for load information.
  • If the load information is listed in Amps, add up the number of Amps for each product you would like to protect on one Zero Surge unit to determine the full load.  This will be your minimum size requirement.
  • If the load information is listed in Watts, not Amps, a simple calculation can be performed.
  • To calculate from Watts to Amps, divide the total Watts by 120 (600 watts = 5 amps). Do this for all of the equipment you would like to protect, total them, and you will have your minimum size requirement.

The chart below contains size requirements for some common applications:

Amp Chart 4

Home Office/Computer
Most computer systems draw less than 5 amps so a 7.5 amp suppressor would do the job for a typical computer set-up. If you have a lot of “extras” that are sharing the suppressor or need to protect 2-3 computer systems with one suppressor, a 15 amp model would be required. If putting ahead of a UPS to protect your battery back-up, a 15 amp unit is required. To insure you are choosing the right size, calculate the amps required (see below).

Home Electronics
For a typical audio set up, 15 amps would be fine. If you have specialty items with a 20 amp plug or are plugging many “extra” high load accessories into the unit, a 20 amp model would be needed (which requires a 20 amp wall receptacle and wiring).

For a simple TV with a VCR and/or DVD, the 7.5 amp model may be ample. A TV and sound system, however, would require additional capacity so a 15 amp model would probably be required. If the TV and sound system have many “extra” high load accessories or 20 amp receptacle requirements, you would need a 20 amp model (which requires a 20 amp wall receptacle and wiring).