Desktop UPS System 500VA 120V USB Port Tel DSL Ethernet

Internet Office 500VA Tower Standby 120V UPS with USB port


  • 500VA tower 120V standby UPS
  • Maintains AC output during power failures
  • 3 UPS battery supported outlets, 3 surge-only outlets
  • USB port, TEL/DSL/ethernet protection
  • NEMA 5-15P input plug and 6 NEMA 5-15R outlets

Tripp Lite's INTERNETOFFICE500 standby UPS system offers surge suppression and long-lasting battery support for personal computers, internetworking equipment and other sensitive electronics. Internal UPS circuits support entry-level PC systems for up to 30 minutes during power failures and brownouts so that connected equipment can be shut down without data loss. Offers complete desktop power protection in an attractive gray tower configuration. Includes 3 battery-supported outlets for computer, monitor and one vital system peripheral, plus 3 additional surge suppression-only outlets for printers and other system accessories not requiring battery support. USB port enables optional unattended system shutdown without data loss in case of extended power failure; cable included. PowerAlert software available via FREE download from Built-in TEL/DSL or ethernet line surge suppression protects connected equipment from damaging surges. Built-in audible alarm and 3 front-panel LEDs indicate line power status, battery power status and battery low/replace status. 500VA/280W power handling ability supports entry-level PCs, network workstations, point-of-sale equipment, small business phone systems, audio/video equipment and home theater systems. Offers 4.6 min. battery runtime with a full load of 500VA and 14.8 min. with a half load of 250VA. Supports user battery replacement via built-in access panel. $150,000 connected equipment insurance (USA, Puerto Rico, & Canada only).

Key Features

  • INTERNETOFFICE500 standby UPS system offers UPS battery support, plus complete AC and tel/Ethernet modem line surge suppression
  • Supports entry level PC systems for up to 30 min. during brownouts and power failures, enabling safe system shutdown
  • Supports a max load of 500VA/280W for 4.6 min.
  • Supports a half load of 250VA/140W for 14.8 min.
  • Supplies battery-derived AC output during brownouts starting at 99V and overvoltages starting at 147V; user adjustment allows fine tuning of brownout response to any setting from 83V to 99V
  • Attractive gray tower configuration
  • Includes 3 battery-supported outlets, 3 surge suppression-only outlets and 6-ft. AC line cord (all NEMA 5-15)
  • USB port enables safe unattended shutdown without data loss during extended power failures; includes USB cable
  • USB port supports messaging of UPS and line power status, including on-battery, low-battery, power-restored, AC line voltage, DC battery voltage and battery capacity
  • Interface supports timed inverter shutoff after unattended shutdown PowerAlert software available via FREE download from
  • HID-compliant USB port also enables integration with built-in power management and auto shutdown features of Windows and Mac OS X
  • Supports Tripp Lite's WatchDog software application to restore unresponsive programs by automatically restarting them and rebooting completely locked computers by automatically switching UPS power off and back on again
  • Built-in dataline suppression jacks protect a single dialup phone/DSL line or network Ethernet line connection
  • Built-in audible alarm and 3 front-panel LEDs indicate line power, battery power and battery low/replace status
  • 500VA/280W power handling ability supports a variety of computer, internetworking, telecom and consumer electronics equipment
  • Supports user battery replacement via built-in access panel
  • Optional PDUB15 bypass PDU enables hot-swappable UPS replacement with no disruption to connected equipment
  • Compatible with 120V/60Hz applications for USA, Canada, Mexico and more
  • $150,000connected equipment insurance (USA, Puerto Rico, & Canada only)

Package Includes

  • USB cable
  • Phone cable
  • Instruction manual


Output Volt Amp Capacity (VA) 500
Output Watt Capacity (Watts) 280
Nominal Output Voltage(s) Supported 115V; 120V
Frequency Compatibility 60 Hz
Output Voltage Regulation (Battery Mode) 115V (+/- 5%)
UPS Output Receptacles 6 5-15R outlet(s)
UPS Output Receptacles (Surge Suppression Only) 3 UPS outlets, 3 surge-only outlets
Hot-Swap PDU options PDUB15 (2U / 8 5-15R outlets)
Output AC Waveform (AC Mode) Sine wave
Output AC Waveform (Battery Mode) PWM sine wave


Rated input current (Maximum Load) 10A
Nominal Input Voltage(s) Supported 120V AC
UPS Input Connection Type 5-15P
UPS Input Cord Length (ft.) 6
UPS Input Cord Length (m) 1.8
Recommended Electrical Service 15A 120V
Input Cord Length (ft.) 6
Input Cord Length (m) 1.8
Input Phase Single-Phase


Full Load Runtime (min.) 4.6 min. (280w)
Half Load Runtime (min.) 14.8 min. (140w)
DC System Voltage (VDC) 12
Internal UPS Replacement Battery Cartridge RBC51
Battery Access Battery access door
Battery Replacement Description Hot-swappable, user replaceable batteries


LED Indicators 3 LEDs indicate line power, battery power and battery low/replace status
Audible Alarm Audible alarm indicates power-failure and low-battery conditions
Alarm Cancel Operation Power-fail alarm can be silenced using alarm-cancel switch; once silenced, alarm will re-sound to indicate low-battery status
Switches 2 Switches control off/on power status and alarm-cancel/self-test operation


UPS AC Suppression Joule Rating 480
UPS AC Suppression Response Time Instantaneous
UPS Dataline Suppression 1 line TEL/DSL (1 in / 1 out); 10/100Base T Ethernet
EMI / RFI AC Noise Suppression Yes
AC Suppression Joule Rating 480
AC Suppression Response Time Instantaneous


Installation Form Factors Supported with Included Accessories Tower
Installation Form Factors Supported with Optional Accessories Wallmount (UPSWM - tower mounting kit)
Primary Form Factor Tower
UPS Power Module Dimensions (hwd, in.) 8.5 x 5.2 x 7
UPS Power Module Dimensions (hwd, cm) 21.6 x 13.3 x 17.8
UPS Power Module Weight (lbs.) 14
UPS Power Module Weight (kg) 6.4
UPS Shipping Dimensions (hwd / in.) 12 x 8.2 x 10
UPS Shipping Dimensions (hwd / cm) 30.5 x 21 x 25.4
Shipping Weight (lbs.) 15.4
Shipping Weight (kg) 7
UPS Housing Material PVC


Operating Temperature Range +32 to +104 degrees Fahrenheit / 0 to +40 degrees Celsius
Storage Temperature Range +5 to +122 degrees Fahrenheit / -15 to +50 degrees Celsius
Relative Humidity 0 to 95%, non-condensing
AC Mode BTU / Hr. (Full Load) 60.8
Battery Mode BTU / Hr. (Full Load) 334.5
AC Mode Efficiency Rating (100% Load) 94%


Communications Interface USB (HID enabled)
PowerAlert Software Free download from
Communications Cable USB interface cable included
WatchDog Compatibility Supports Watchdog application, OS and hard-reboot restart options for remote applications
Network UPS Tools Compatibility NUT compatible. See the full list of Tripp Lite NUT compatible UPS systems at Lite


Transfer Time 2-4 milliseconds
Low Voltage Transfer to Battery Power (Setpoint) 99V (adjustable to 83V via potentiometer)
High Voltage Transfer to Battery Power (Setpoint) 176 (adjustable to 147 via potentiometer)


Cold Start (Startup in Battery Mode During a Power Failure) Cold-start operation supported
High Availability UPS Features Hot swappable batteries
Green Energy-Saving Features Greater than 95% efficiency - GREEN UPS


UPS Certifications Tested to UL1778 (USA); Tested to CSA (Canada); Tested to NOM (Mexico); Meets FCC Part 15 Category B (EMI)


Product Warranty Period (U.S. & Canada) 3-year limited warranty
Product Warranty Period (Latin America) 3-year limited warranty
Product Warranty Period (International) 2-year limited warranty
Product Warranty Period (Mexico) 3-year limited warranty
Connected Equipment Insurance (U.S., Canada & Puerto Rico) $150,000 Ultimate Lifetime Insurance

† Tripp Lite uses primary and third-party agencies to test its products for compliance with standards. See a list of Tripp Lite's testing agencies.

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Product Warranty

This product has a 3-year limited warranty. Get more information

Insurance Coverage

This product includes a $150,000 Ultimate Lifetime Insurance for connected equipment. Click for details

Software & Downloads

More Support Resources for INTERNETOFFICE500


Free Power Management Software for your INTERNETOFFICE500

learn more

Runtime at Full Load

4.6 min. (280w)

Runtime at Half Load

14.8 min. (140w)

see complete runtime chart

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RBC51 replacement UPS battery Does your UPS need a new battery?

Get it here! Your INTERNETOFFICE500 requires 1 RBC51 battery.

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