Amateur radio

LA303R 3-Phase Lightning Arrestor — 208–250 VAC Protection

5.0 2 reviews 1 min read

LA303R 3-Phase Lightning Arrestor — 208–250 VAC Protection

Product description

The LA303R is a three-phase lightning arrestor engineered for 208–250 VAC systems. It is intended for use on three or four wire services and is fitted to protect the three hot conductors of a three-phase distribution line.

Rated for 250 volts nominal, the unit mounts in a weatherproof N-4 enclosure to withstand outdoor exposure. Its compact cylindrical footprint measures approximately 2 1/4 inches in diameter and 4 1/2 inches tall, making it suitable for tight spaces or panel-top mounting.

Package contents include the LA303R arrestor unit ready for wiring into a three-phase circuit. It’s wired inline with the hot conductors and provides surge diversion during lightning-induced transients; routine installation requires standard electrical precautions and proper connection to the intended 3- or 4-wire service.

Pros

  • Protects three hot conductors in three-phase systems
  • Weatherproof N-4 enclosure for outdoor use
  • Compact dimensions for tight mounting locations

Cons

  • Limited to systems up to 250 VAC
  • No performance feedback until a surge occurs
  • Requires correct wiring knowledge for installation

VerdictA straightforward surge arrestor aimed at protecting three-phase circuits up to 250 VAC. It’s built into a weatherproof N-4 case and sized for tight mounting locations. Installation is simple for those familiar with three- or four-wire arrangements, but actual effectiveness only becomes apparent during real surge events.

Reviews

  1. TC 5/5

    Quick to mount, waiting to be tested

    Installation was straightforward. I’ll see how it performs when a lightning surge happens and will update with results.

  2. yagottaloveit 5/5

    Works as expected from prior units

    Simple hookup and clear instructions. I’ve used this model before and it has performed reliably.

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