Understanding UPS Topologies: Online vs. Line-interactive vs. Standby

Double Conversion UPS, Line-interactive UPS, Online UPS, Standby UPS, Toshiba UPS, UPS -

Understanding UPS Topologies: Online vs. Line-interactive vs. Standby

UPS Technologies

When choosing a UPS (Uninterruptible Power Supply) to protect your electronic equipment there are 3 main UPS technologies on the market today.  The standby UPS is a low cost option that will protect you from power failure, sags and surges, while an online UPS offers total power protection from all 9 power problems

Standby UPS

Standby UPS technology

  • Low price protection from power failure, sags and surges
  • UPS will switch to battery if a failure, surge or sag is detected
  • Results in frequent battery use, which reduces runtime and service life


Line Interactive UPS

 Line-interactive UPS technology 

  • Regulates voltage by boosting/decreasing utility power before passing it through to your electronics
  • Transfer to battery within 3-8 ms
  • In addition to failure, sags and surges will also protect against brownouts and noise
  • Battery use less than standby but greater than online

Online UPS

 Online double conversion UPS technology

  • Highest level of protection: ensures delivery of clean and stable power to critical loads by converting and conditioning utility power first to DC and then back to AC
  • Protects from all 9 power quality problems
  • 0 transfer time
  • Isolates equipment from harmonic distortions and is strongly recommended for critical applications
  • Uses the battery less often than standby and line-interactive, increasing battery life


If you would like help choosing the right UPS for your application give us a call and talk to a UPS expert.  

1-6kVA Online UPS
Greater than 6 kVA Online UPS