Tripp Lite
1111 W. 35th Street
Chicago, IL 60609
1 773.869.1774
1 773.869.1329

Internet Office 120V 350VA 180W Standby UPS, 6 Outlets (NEMA 5-15R), 5-15P Plug, DB9, Tel/DSL

Model Number: INTERNET350SER

Compact desktop UPS system protects your computer and its peripherals from blackouts, brownouts, power surges and line noise that can damage or destroy equipment, wipe out valuable data, and degrade component performance.
  • 6 NEMA 5-15R outlets—3 battery-backup, 3 surge-protected only
  • Single-line RJ11 jack protects phone/fax line against surges
  • 6 ft. power cord with space-saving right-angle NEMA 5-15P plug
  • LEDs and audible alarm provide instant status reports
  • 12.2 min. runtime at half load; 3.3 min. at full load
  • 3-year limited warranty


The INTERNET350SER Internet Office® 120V 350VA 180W Standby UPS protects your PC and other expensive equipment against common power threats, such as blackouts and surges. Reliable battery backup support allows you to work through short power failures, and gives you enough time to safely save files and shut down your system in case of a prolonged blackout. The internal battery provides 12.2 minutes of runtime at half load and 3.3 minutes at full load. During normal operation, incoming utility power keeps the UPS battery fully charged, so backup power will always be available.

Connect your equipment to the six NEMA 5-15R outlets. Three outlets provide both battery backup and surge protection to your computer, monitor and other crucial components. The other three are surge-protected only for printers, scanners and other non-essential equipment. A single-line RJ11 jack protects a standard dial-up/DSL phone connection from dataline surges.

A built-in audible alarm and front-panel LEDs provide real-time line and battery status at a glance. A DB9 interface port works with Tripp Lite’s free downloadable PowerAlert® software to enable safe unattended system shutdown and file saves in the event of a prolonged power failure when you aren’t around.

The UPS system’s compact housing fits easily on a desktop, shelf or anywhere else convenient to your workstation. The six-foot power cord with right-angle NEMA 5-15P plug connects to a standard AC outlet.


350VA 180W Standby UPS System
  • Protects PC and other equipment against common power threats, such as blackouts and surges
  • Allows enough time to safely save files and shut down system in case of prolonged blackout
  • Supports half load for 12.2 min. and full load for 3.3 min.
  • Incoming AC power keeps internal battery charged during normal operation
  • Compatible with 120V 60Hz applications in North America and other countries

6 NEMA 5-15R Outlets for Connecting Equipment
  • 3 outlets provide both battery backup and surge protection to crucial components (PCs, monitor, router)
  • 3 outlets provide surge protection only for non-essential equipment (printers, scanners)
  • Robust 510-joule surge protection rating keeps equipment safe
  • RJ11 jack protects standard dial-up/DSL phone line from surges

EMI/RFI Line Noise Filtering
  • Filters out electromagnetic and radio frequency interference that can cause hardware damage, data loss or audio/video transmission problems

DB9 Communication Port
  • Enables data-saving unattended shutdown with Tripp Lite’s PowerAlert software (available via free download at

Diagnostic LEDs and Audible Alarm
  • Alarm sounds to indicate power failure and overloads
  • LEDs indicate power status and overload/check battery status

Compact Housing for Convenient Installation
  • Space-saving housing fits on desktop, shelf or almost anywhere convenient to your workstation
  • 6 ft. power cord with right-angle NEMA 5-15P plug allows furniture to be placed flush against the wall

Package Includes

  • INTERNET350SER Internet Office 120V 350VA 180W Standby UPS
  • DB9 serial interface cable
  • Owner’s manual
RoHS compliant


UPC Code037332123428
UPS TypeStandby
Output Volt Amp Capacity (VA)350
Output Watt Capacity (Watts)180
Nominal Voltage Details115v nominal output in battery mode
Frequency Compatibility60 Hz
Output Voltage Regulation (Battery Mode)+/- 5%
UPS Output Receptacles (Surge Suppression Only)3 UPS outlets, 3 surge-only outlets
Output AC Waveform (AC Mode)Sine wave
Output AC Waveform (Battery Mode)PWM sine wave
Nominal Output Voltage(s) Supported110V; 115V; 120V
Output Receptacles(6) 5-15R
Individually Controllable Load Banks  No
Rated input current (Maximum Load)10A
Nominal Input Voltage(s) Supported120V AC
UPS Input Connection Type5-15P; Right-Angled
UPS Input Cord Length (ft.)6
Recommended Electrical Service15A 120V
Input PhaseSingle-Phase
Full Load Runtime (min.)  3.3 min. (180W)
Half Load Runtime (min.)  12.2 min. (90w)
DC System Voltage (VDC)12
Internal UPS Replacement Battery CartridgeIMPORTANT BATTERY REPLACEMENT INFORMATION > If your  INTERNET350SER  has no battery access door, please contact a local electronics repair technician to source and install a matching replacement battery; If your  INTERNET350SER  UPS does have a battery replacement door and the original battery inside has a rating of 12V 2.8AH, please contact Tripp Lite for assistance "
Expandable RuntimeNo
SwitchesCombination switch controls on/off power status and self-test operation
Audible AlarmAudible alarm indicates on-battery, low-battery and overload status
UPS AC Suppression Joule Rating420
UPS AC Suppression Response TimeInstantaneous
UPS Dataline Suppression1 line TEL/DSL (1 in / 1 out)
EMI / RFI AC Noise Suppression  Yes
Installation Form Factors Supported with Included AccessoriesTower; Ultra-compact desktop; Wallmount
Primary Form FactorDesktop
Primary UPS Depth (mm)165
Primary UPS Height (mm)76
Primary UPS Width (mm)210
Shipping Dimensions (hwd / in.)4.30 x 12.30 x 7.80
Shipping Weight (lbs.)8.60
UPS Housing MaterialABS
UPS Power Module Dimensions (hwd, in.)3 x 8.25 x 6.5
UPS Power Module Weight (kg)2.38
UPS Power Module Weight (lbs.)5.25
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 Humidity0 to 95%, non-condensing
AC Mode BTU / Hr. (Full Load)  7
AC Mode Efficiency Rating (100% Load)99%
Communications InterfaceDB9 Serial
PowerAlert SoftwareFor local monitoring via the UPS’s built-in DB9 Serial port, download PowerAlert Local software at
Communications CableDB9 interface cable included
Transfer Time  2-4 milliseconds
Low Voltage Transfer to Battery Power (Setpoint)99
High Voltage Transfer to Battery Power (Setpoint)139
Cold Start (Startup in Battery Mode During a Power Failure)Cold-start operation supported
UPS CertificationsTested 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
Connected Equipment Insurance (U.S., Canada & Puerto Rico)$100,000 Ultimate Lifetime Insurance 


Power Distribution Units (PDUs)
  Model Number Description
PDUB15 | Power Distribution Units (PDUs) PDUB15 1.44kW Single-Phase Hot-Swap PDU, 120V 15A Outlets (8 5-15R), 2 5-15P, 10ft & 6ft Cords 2U Rack-Mount

Extended Warranties

Part Number Description
WEXT1B 1-Year Extended Warranty - For select Tripp Lite Products
WEXT2B 2-Year Extended Warranty - For select Tripp Lite Products
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Need help with your purchase?
We're always available to help with questions, including product selection, sizing, installation and product customization. Call us at 1 773.869.1774 or email