There are nine common types of power problems, shown in the table below. The 3-5-9 concept clarifies what types of problems can be avoided with which solutions, and in which environment each solution is the most useful.
A basic solution that protects non-critical hardware and data against three out of the nine power problems.
These UPSs operate in standby mode.
Series 3 UPS Products
An intermediate solution for office environment and servers featuring good communication options.
Operating in line-interactive mode, these UPSs provide protection from the five most common power problems.
Series 5 UPS Products
These double-conversion UPSs with excellent connectivity and communication features provide full protection against all nine types of power problems.
Most of them can run in parallel, thus providing 100-% uptime in the most critical of applications.
Series 9 UPS Products