Tripp Lite ULTRABLOK-428
Isobar Ultra Surge Suppressor


Our Price: $29.97
List Price: $37.60
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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).

  • PLUG/OUTLETS: 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


  • Tripp Lite's ISOBAR is the world's #1 selling premium suppressor series with more than 15 million satisfied customers and a safety-tested history of 20+ years
  • Robust surge suppression with sine wave tracking protects against the heaviest of surge conditions, exceeding IEEE category A&B specifications
  • Multi-component suppression circuits combine torroidal chokes, HF/VHF capacitors and metal oxide varistors
  • 2 outlets with standard duplex wall outlet spacing offer convenient wall receptacle mount placement. Included mounting tab allows permanent connection via wall receptacle switch plate screw.
  • Heavy-grade surge suppression rated at 600 joules/48,000 amps
  • 3 LED indicators confirm suppressor operation and site wiring status, plus warning of suppressor or electrical fault conditions
  • 120V AC, 50/60Hz, 15A electrical compatibility

Specifications: See Product Description PDF

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