MCM Electronics

2 Outlet Surge Protector - 600 joules By Tripp Lite (ULTRABLOK428) MCM Part #28-10875

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For more than 20 years, America's leading companies have trusted Tripp Lite's Isobar Premium surge and noise suppressors to protect sensitive computer, networking and telecom equipment. Loaded with a generous combination of high-quality components, near indestructible all-metal case and unique noise filtration system, Isobars offer the highest levels of protection.

Robust surge suppression circuits with sine wave tracking offer extreme levels of protection against the heaviest surge conditions. Isobar's unique protection system combines large torroidal chokes, HF/VHF capacitors and multiple metal oxide varistors that remove high-level surges and EMI/RFI interference. UltraBlok 428 offers 2 outlets arranged with standard wall socket spacing in a cordless direct plug-in format. Mounting tabs allow permanent connection via duplex switchplate screw. Surge suppression rated at 600 joules/48,000 amps offers high-grade protection. Diagnostic LEDs confirm power availability, line fault and protection status. Lifetime warranty with $10,000 Ultimate Lifetime connected equipment Insurance (USA & Canada Only).

Input: NEMA 5-15P;
Output: 2 NEMA5-15R

ELECTRICAL: 120V AC, 50/60Hz, 15A (Requires NEMA 5-15R wall receptacle)

SUPPRESSION: AC: 140V RMS Clamping/600 joules/48,000 amps

FORMAT: Direct plug-in, receptacle mount form factor

Typical ApplicationsIdeal for premium AC protection for personal computers with peripherals, network and CAD/CAM/CAE workstations, internetworking accessories, telecommunications systems, point of sale equipment, audio/video and home theater systems in any home, office or industrial application.

Package Includes

  • ULTRABLOK428 premium surge suppressor
  • Instruction manual and warranty informationSYSTEM OVERVIEW
    ULTRABLOK428 premium direct plug-in surge and noise suppressor prevents equipment damage and performance problems resulting from damaging transient surges and line noise. Active filter network maintains noise-free output with zero reaction / response time. Rugged all-metal housing makes this system ideal for demanding environments. Mounting bracket and included screw securely mounts the suppressor to a standard duplex wall socket. 2 AC outlets, 600 joules AC protection level, 3 diagostic LEDs.
  • Voltage compatibility: 120 VAC
  • Frequency compatibility: 50/60 Hz


  • Output volt amp capacity (amps): 15
  • Output watt capacity (watts): 1800
  • Outlet quantity / type: 2 NEMA 5-15R


  • Input connection type: NEMA 5-15P
  • Input cord length (ft.): Direct plug-in
  • Recommended electrical service: 120V,15A


  • Diagnostic LEDs: PROTECTION PRESENT (green), LINE FAULT (red) and LINE OK (green)


  • Protection modes: Includes full normal mode (H-N) and common mode (N-G / H-G) line surge suppression
  • AC suppression joule rating: 600 joules
  • Clamping voltage (RMS): 140V
  • AC suppression response time: NM = 0 ns. CM = <1 ns
  • AC suppression surge current rating: 48,000 amps
  • AC suppression components used: Metal oxide varistors, toroidal balanced chokes and VHF capacitors
  • Safe thermal fusing: Prevents unsafe conditions during extreme extended overvoltages and catastrophic occurences
  • EMI / RFI filtering: 40-80 dB
  • Immunity: Conforms to IEE 587 / ANSI C62.41


  • Unit Dimensions (HWD/in): 4 x 2.5 x 2.5
  • Unit Dimensions (HWD/cm): 10.2 x 6.4 x 6.4
  • Material of construction: Metal
  • Form factors supported: Direct plug-in format with retaining bracket supports wall mounting directly to a standard AC wall socket
  • Housing color: Black
  • Receptacle color: Black


  • UL1449 1998 Rev. (AC Suppression): UL1449
  • L1283 (EMI Filter): UL1283
  • cUL / CSA (Canada): cUL
  • Approvals: Exceeds IEEE 587 category A&B specifications


  • Product warranty: Lifetime
  • Connected equipment insurance (USA and Canada Only): $10,000


  • Appearance: Attractive, all-black color scheme
    Part Numbers
    MCM Part #:28-10875
    Tripp Lite Part #:ULTRABLOK428
    Package Specifications & Dimensions
    Weight:0.5 lbs.
    Warranty:90 days
    Need to Return?
    Length:6 in.
    Width:4 in.
    Height:3 in.
    Shipping Information
    Extra Shipping Charge:No
    Drop Ship:No
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