MCM Electronics

InternetSer550 Low Profile Serial Monitor By Tripp Lite (INTERNET550SER) MCM Part #28-8875

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Ultra-compact standby UPS with built-in DB9 serial monitoring port protects PCs, network workstations and other systems reliant upon a simple serial communications interface for UPS monitoring and unattended system shutdown. Maintains AC output during blackouts and brownouts starting at 99V. Includes DB9 monitoring port with cabling, TEL/DSL line surge suppression, surge-only outlets and LED indicators. PowerAlert software available free via download.

Specifications Top

Typical Applications

  • Ideal protection for PCs, workstations and other devices running Windows NT and other operating systems requiring contact closure serial interface for unattended shutdown

Options & Accessories

  • Watchdog software: WATCHDOGSW
  • Dataline protectors: DNET1 DTEL2, DCATV
  • Circuit Tester: CT120
  • Extended warranties: 3 Year WEXT3-INTERNET, 5 Year WEXT5-INTERNET

Package Includes

  • INTERNET550SER standby UPS system
  • DB9 serial cable for use with PowerAlert UPS monitoring software
  • Telephone cable for use with single line dialup surge suppression
  • Instruction manual and warranty information

System Overview

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


  • Output volt amp capacity (VA): 550
  • Output watt capacity (watts): 300
  • Output nominal voltage: 120V
  • Output voltage regulation: LINE MODE: Passes sine wave line voltage from 100-138V to connected equipment unchanged 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 60zHz +/-0.5Hz
  • Outlet quantity / type: 8 NEMA 5-15R
  • Overload protection: 10A input breaker


  • Maximum input amps: 10A
  • Input connection type: NEMA 5-15R space saving right-angle plug
  • Input cord length: 6 ft., 18 gauge
  • Recommended electrical service: 15A, 120VAC


  • Full load runtime: 3.5 minutes (550VA)
  • Half load runtime: 10 minutes (275VA)
  • DC system voltage: 12VDC
  • Typical battery lifespan: 3-6 years, depending on usage
  • Battery recharge rate: 2-4 hours to 90%
LEDs Alarms & Switches
  • Front panel LEDs: 2 LEDs indicate line power, battery power status
  • Alarms: Audible alarm indicates battery backup operation
  • Switches: Power on/off/test switch
Surge / Noise Suppression
  • AC surge suppression: 252 joules
  • AC suppression response time: Instantaneous
  • Dataline suppression: Tel/DSL
  • EMI / RFI AC noise suppression: Yes
  • Shipping weight (lbs): 7
  • Shipping weight (kg): 3.2
  • Unit weight (lbs): 6.5
  • Unit weight (kg): 3
  • Unit Dimensions (HWD/in): 3.1 x 5.7 x 10.9
  • Unit Dimensions (HWD/cm): 7.9 x 14.5 x 27.7
  • Shipping Dimensions (HWD/in): 4.1 x 8 x 13
  • Shipping Dimensions (HWD/cm): 10.4 x 20.3 x 33
  • Material of construction: ABS
  • Form factors supported: Ultra-compact
  • 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: DB9
  • Software and cabling included: Includes DB9 serial cable, PowerAlert software available via free download from
  • WatchDog compatibility: Compatible with Tripp Lite's WatchDog system service to restore operation to locked equipment. Ideal for unattended kiosk applications.
Line / Battery Transfer
  • Transfer time from line power to battery mode: 2-4 milliseconds
  • Low voltage transfer to battery power: Switches to battery power as line voltage drops to 99V. Resets back to line power 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 to line power as line voltage drops to 135V or lower
  • Certifications: Tested to UL1778 (USA), CSA C22.2 No. 107.3 (Canada), Class B (Emissions), NOM (Mexico), FCC Part 68 / Industry Canada (telecommunications), RoHS Compliant
  • Product warranty: 2 years
  • Connected equipment insurance (USA and Canada Only): $100,000 connected equipment insurance (USA and Canada only)
Special Features
  • Cold Start: Inverter can be cold started to enable temporary AC output during a power failure
  • Appearance: Attractive black ultra-compact housing

Part Numbers
MCM Part #:28-8875
Tripp Lite Part #:INTERNET550SER
Package Specifications & Dimensions
Weight:11.65 lbs.
Warranty:90 days
Need to Return?
Length:13.5 in.
Width:9 in.
Height:5 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages
MCM Cat 57, Page 850
MCM Cat 56, Page 760
View in Catalog

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