MCM Electronics

Internet Office 550U Backup UPSMCM Part #: 28-10095  |  Tripp Lite Part #: INTERNET550U

Internet Office 550U Backup UPS 5 stars from 1 review.
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Tripp Lite's INTERNET550U standby UPS offers complete protection for PCs, workstations and other sensitive electronics in an attractive ultra-compact, mountable housing. Prevents data loss and system downtime by providing battery supported AC output during brownouts and blackout conditions.

Product Description


  • 8 output receptacles, two of which are widely-spaced to accommodate large transformer plugs without blocking outlets
  • 4 outlets with full battery support and surge suppression protect computers, monitors and other vital system components from loss of power
  • 4 additional outlets with surge suppression-only are ideal for printers and other accessories not requiring battery support
  • Single line telephone suppression jacks protect modem, fax machine, cordless phone or other peripherals with a standard dialup or DSL phone line connection
  • USB port with PowerAlert monitoring software and cabling enables safe unattended system shutdown in the case of extended power failure<.li>
  • HID-compliant USB interface enables integration with built-in power management and auto-shutdown features of Windows and Mac OS X. Audible alarm and front panel LEDs offer status information regarding line and battery power operation
  • 550VA / 300 watt power handling ability supports entry-level PCs for up to 17 minutes during power failures

Typical Applications

Basic PCs for home / home-office use, network workstations, audio/video equipment, home entertainment systems and other sensitive electronic devices.

Options & Accessories

  • Watchdog software: WATCHDOGSW
  • USB Hubs: U222-004-R, U202-004-R, U203-004-R, U205-004-R
  • USB Extension Cables: U004-006, U004-006-R, U004-010, U004-010-R, U005-010I
  • Dataline protectors: DNET1 DTEL2, DCATV
  • Circuit Tester: CT120
  • Extended warranties: 3 Year WEXT3-INTERNET, 5 Year WEXT5-INTERNET


Ultra compact standby UPS, 4 UPS supported outlets with surge suppression and 4 surge suppression only outlets, single-line TEL/DSL surge suppression and HID compliant USB monitoring port

  • Voltage compatibility: 120VAC
  • Frequency compatibility: 60Hz


  • Output volt amp capacity (VA): 550
  • Output watt capacity (watts): 300
  • Output nominal voltage: 120VAC
  • Output voltage regulation: BATTERY MODE: PWM sine wave output 115V +/-5%
  • Output frequency regulation: LINE MODE: Passes line frequency of 60Hz +/-10% BATTERY MODE: Inverter output regulated to 60Hz +/-0.5Hz
  • Outlet quantity / type: 8 NEMA 5-15R


  • Maximum input amps: 12A
  • Input connection type: NEMA 5-15P space saving right-angle plug
  • Input cord length: 6ft / 1.8m
  • Recommended electrical service: 120V 15A


  • Full load runtime: 3 minutes (550VA)
  • Half load runtime: 9 minutes (275VA)
  • DC system voltage: 12 VDC
  • Typical battery lifespan: 3-6 years, depending on usage
  • Battery recharge rate: Less than 15 hours to 90%


  • Front panel LEDs: 2 LEDs indicate line power, battery power status
  • Alarms: Audible alarm beeps at regular intervals to indicate battery backup operation. Alarm also sounds during self-test operation.
  • Switches: Combination power off / on / self-test push button switch


  • AC surge suppression: 380 joules
  • AC suppression response time: Instantaneous
  • Dataline suppression: Tel/DSL
  • EMI / RFI AC noise suppression: Yes


  • Shipping weight (lbs): 14.25
  • Shipping weight (kg): 6.5
  • Unit weight (lbs): 10.95
  • Unit weight (kg): 5
  • Unit Dimensions (HWD/in): 3.5 x 11.25 x 6
  • Unit Dimensions (HWD/cm): 8.9 x 28.6 x 15.2
  • Shipping Dimensions (HWD/in): 4.75 x 13.5 x 8.75
  • Shipping Dimensions (HWD/cm): 12 x 34.3 x 22.2
  • Material of construction: ABS
  • Form factors supported: Ultra-compact
  • Battery Access: Hot-swappable batteries are accessible via battery door


  • Operating Temperature: +32 to +104 degrees Fahrenheit / 0 to +40 degrees Celsius
  • Storage Temperature: +5 to +122 degrees Fahrenheit / -15 to +50 degrees Celsius
  • Relative Humidity: 0 to 95%, non-condensing


  • Network monitoring port: USB
  • Software and cabling included: Includes USB cable and PowerAlert UPS monitoring software
  • WatchDog compatibility: Yes, compatible with Tripp Lite's Watchdog system service to restore operation to locked equipment through soft reboot of application / OS or hard power off/on reboot of connected equipment - ideal for unattended kiosk applications


  • Transfer time from line power to battery mode: 2-4 milliseconds
  • Low voltage transfer to battery power: Switches to battery power as line voltage decreases to 99 volts or less. Resets back to line power mode as line voltage increases to 104V or higher.
  • High voltage transfer to battery power: Switches to battery power as line voltage increases to 139V or higher. Resets back to line power as line voltage decreases to 135V or less.


  • Certifications: Tested to UL1778 (USA), CSA C22.2 No. 107.3 (Canada), Class B (emissions), FCC Part 68 + IC-DOC, RoHS Compliant


  • Product warranty: 2 years
  • Connected equipment insurance (USA and Canada Only): $100,000 connected equipment insurance (USA, Puerto Rico and Canada only)
  • Optional coverage: Optional 3 and 5 year on site or factory warranties available for select opportunities, contact Tripp Lite for more information


  • Cold Start: Yes, inverter can be cold started to enable temporary AC output during a power failure
  • Appearance: Attractive black ultra-compact housing

Product Reviews

  • "Great UPS Unit" by jkliquid on 6/1/2010
    Overall: 5 out of 5
    Top 10 Contributor

    This product works great and is a good value.

  • Rate It!

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Package Specifications & Dimensions
Weight:16 lbs.
Warranty:30 days
Need to Return?
Length:14.5 in.
Width:10 in.
Height:5.5 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages

MCM Cat 57, Page 850

MCM Cat 56, Page 760

Mfr. Info

Tripp Lite Logo
Mfr. Name:Tripp Lite
Mfr. Part Number:INTERNET550U
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