Product Description
Delta LA303G
5‑Wire • Three Phase • 300VAC AC Lightning Arrestor
Delta LA303G is the grounded version of the LA303, featuring a dedicated separate ground lead for enhanced protection and installation flexibility. The Delta LA Series is engineered for rapid‑response, high‑current surge diversion, safely handling lightning surges up to 50,000 amps.
The LA303G is designed for 110/208/250VAC three‑phase, 5‑wire systems, making it ideal for commercial and industrial applications requiring protection across three hot legs plus a separate ground.
Delta Arrestor Features
- Non‑conductive base prevents shock hazards in the event of failure
- Fails without producing carbon dust that could damage nearby equipment
- Always fails “clear,” allowing continued system operation
- Silicon‑based design for fast response and low conduction resistance
- Handles numerous high‑energy surges and half‑cycle spikes before failure
- Extra‑long leads for easier installation
- Includes locknut and bushing
- Available in multiple voltages and pole configurations
LA303G Specifications
| Rated Voltage | Design Type | Surge Current | Max Energy | Leads | Enclosure Rating | Dimensions |
| 110/208/250V Three Phase 5‑Wire |
Silicon Oxide Varistor™ | 100,000 amps | 3,000 Joules per pole | 36" #12 THHN | NEMA 4 | 4.5" H × 2.25" D |
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