Internet Office 120V 550VA 300W Standby UPS, Ultra-Compact Desktop, DB9 Serial

PART #  381549
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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 basic 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. 3 year warranty (worldwide), plus $100,000 connected equipment insurance (USA, Puerto Rico, & Canada only)


  • INTERNET550SER standby UPS offers protection from blackouts, brownouts and surges on both AC and dialup modem lines
  • Provides seamless battery derived AC output during blackouts and severe brownouts so that connected equipment can be shut down without d ata loss
  • DB9 serial monitoring enables data-saving unattended shutdown when used with Tripp Lite’s PowerAlert software, available via FREE download from
  • Supports 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
  • 4 battery supported outlets protect computer, monitor and one vital system peripheral, plus 4 additional surge suppression-only outlets for printers and other system accessories not requiring battery support
  • Attractive stealth black UPS color scheme
  • Built-in single line phone jacks protects peripherals with a standard dialup phone line connection
  • Built-n audible alarm and front panel LEDs offer continuous status information regarding line and battery power operation
  • 550VA /300 watt power handling ability supports entry-level PC systems for several minutes during power fail conditions
  • Ultra-compact housing fits anywhere, wall mountable
  • Includes attached 6 ft. AC power cord with space saving right angle plug, on/off power switch
  • Compatible with 120V/60 Hz applications in USA, Canada, Mexico and other countries
  • Optional PDUB15 bypass PDU enables hotswappable UPS replacement with no disruption to connected equipment
  • $100,000 Ultimate Lifetime Insurance (U.S., Canada, and Puerto Rico only)

Specification Description

Ultra-Compact Standby UPS With Serial Port
Output VA Capacity: 550 VA
Output Watt Capacity (Watt): 300 Watt
Nominal Output Voltage Supported: 115 Volt, 120 Volt
Frequency Compatibility: 60 Hz
Output Voltage Regulation (Battery Mode): 115 Volt (+/- 5%)
UPS Output Receptacles (Surge Suppression Only): 4 UPS Outlets, 4 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): 10 Amp
Nominal Input Voltage Supported: 120 Volt AC
UPS Input Connection Type: 5-15P
Input Circuit Breakers: 10 Amp
UPS Input Cord Length: 1.8 m (6 ft)
Recommended Electrical Service: 15 Amp 120 Volt
Input Phase: Single-Phase
Half Load Runtime: 11.5 Min (150 Watt)
DC System Voltage: 12 Volt DC
LED Indicator: 2 LEDs Indicate Power Status And Overload/Check Battery Status
Audible Alarm: Audible Alarm Indicates Power-Failure And Overload Status
Switches: Combination Switch Controls On/Off Power Status And Self-Test Operation
UPS AC Suppression Joule Rating: 420
UPS AC Suppression Response Time: Instantaneous
UPS Dataline Suppression: 1 Line TEL/DSL (1 In/1 Out)
EMI/RFI AC Noise Suppression: Yes
Installation Form Factors Supported With Included Accessories: Tower, Ultra-Compact Desktop
Primary Form Factor: Desktop
UPS Power Module Dimensions (HxWxD): 3.1 Inch x 10.9 Inch x 5.7 Inch (7.9 cm x 27.7 cm x 14.5 cm)
UPS Power Module Weight: 6.5 lb (3 kg)
UPS Housing Material: ABS
Operating Temperature Range: 32 to 104 deg F (0 to 40 deg C)
Storage Temperature Range: 5 to 122 deg F (-15 to 50 deg C)
Relative Humidity: 0 - 95% Non-Condensing
AC Mode BTUs (Full Load): 10.3 BTU/Hour
Battery Mode BTUs (Full Load): 194.3 BTU/Hour
AC Mode Efficiency Rating (100% Load): 99%
Communications Interface: DB9 Serial
Communications Cable: DB9 Interface Cable Included
Watchdog Compatibility: Supports Watchdog Application, OS And Hard-Reboot Restart Options For Remote Applications
Transfer Time: 2 - 4 mS
Low Voltage Transfer to Battery Power (Setpoint): 99 Volt
High Voltage Transfer To Battery Power (Setpoint): 139 Volt
Cold Start (Startup in Battery Mode During a Power Failure): Cold-Start Operation Supported
Green Energy-Saving Features: >95% Efficiency - Green UPS
Output Receptacle: (8) 5-15R


Size 550
UNSPSC Code 39121011

Spec Sheet

Spec Sheet

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