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Light gray rectangular surge protector with four outlets and a six-foot cord

Tripp Lite

Tripp Lite ISOBAR4ULTRA 4-outlet 3330 J surge protector 6 ft

SKU CH-283Z-8MGDH MPN ISOBAR4ULTRA

Four-outlet surge suppressor rated at 3330 joules with isolated filter banks, 6 ft cord and 120 V 15 A capacity

  • Power outlets4
  • Outlet typeNEMA 5-15R
  • Cord length6 ft (1.83 m)
  • Supply voltage120 V
  • Input connectionsNEMA 5-15P
  • Supported voltage120 V AC

Outlets 4

  • 3330-joule rating shields connected devices from damaging power surges
  • Four NEMA 5-15R outlets accept a wide range of standard equipment plugs
  • Isolated filter banks deliver 40 to 80 dB EMI/RFI noise filtering for cleaner power
  • 140 V RMS clamping voltage reacts quickly to suppress voltage spikes
  • Six-foot cord and 2.5" x 9" x 3.5" housing fit easily on a desk or wall

Four Outlets for Home or Office Electronics

The ISOBAR4ULTRA provides four NEMA 5-15R outlets with a 3330 joule surge rating and 1440 watt load capacity. A six foot cord and light gray housing fit standard North American 120 volt wall receptacles. Isolated filter banks deliver 40 to 80 decibels of EMI and RFI noise filtering for connected devices.

Limits of the 120 Volt 15 Amp Circuit

The unit draws from a single NEMA 5-15P plug rated for 12 amps continuous output. Total connected equipment must not exceed 1440 watts on the shared branch circuit. Clamping voltage is 140 volts RMS across normal and common modes. The 3330 joule rating represents the total energy the suppressor can absorb over its service life.

Replaces Basic Power Strips Without Protection

This suppressor upgrades from unprotected strips that pass transients directly to sensitive electronics. The jump is worth it when equipment requires both surge diversion and line noise filtering in a compact form factor. Buyers needing more than four outlets or higher amperage capacity should consider units with additional receptacles or a higher circuit rating.

How it compares

Measured against everything we stock in Surge Protector Power Strips, at today’s prices. Recalculated every night.

Price $70.99
Pricier than about 74% of the 565 comparable items (median $37.99).

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Specifications

Product
Brand nameTRIPP LITE
Product lineIsobar
Model nameISOBAR4ULTRA
Product colorLight Gray
Audio & video
Emi/rfi noise filter40–80 dB
Power
Power outlets4
Outlet typeNEMA 5-15R
Supply voltage120 V
Supported voltage120 V AC
Output current rating12
Output power1440 W
Surge energy rating3330 Joules
Clamp voltage140 V - RMS
Protection typesIncludes full normal mode (H-N) and common mode (N-G / H-G) line surge suppression
Size & build
Cord length6 ft (1.83 m)
Product dimensions2.5 in × 9 in × 3.5 in
Product weight2.4 lb (1.09 kg)
Shipping weight1.14 kg
Package size292 × 170 × 79 mm
In the box
In the boxISOBAR4ULTRA premium surge suppressor
Set of 4 outlet safety covers
Instruction manual with warranty information
More details
Input connectionsNEMA 5-15P

Other versions of this model

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Questions about this item

How do I decide whether the 3330-joule rating is enough for my setup?

The 3330-joule rating measures total energy the unit can absorb before the protection degrades. For typical desktop computers, monitors and networking gear on a 120 V circuit, this level is considered network-grade and covers most home or office configurations.

What does the 140-volt clamping voltage mean when the strip is plugged into a 120 V outlet?

Clamping at 140 V RMS means the suppressor begins diverting excess voltage once the line rises roughly 20 V above the 120 V nominal peak, limiting the spike that reaches connected equipment.

What does the NEMA 5-15P plug and 12 A rating limit in practice?

The NEMA 5-15P input and 12 A output capacity cap the total connected load at 1440 W on a standard 120 V branch circuit, so the combined draw of all four outlets must stay below that figure.

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