Transtector’s SDA series surge protection products are available in multiple voltage configurations, including 480 Vac 3-phase delta and 277/480 3-phase wye. The SDA surge protectors are housed NEMA 4, outdoor, metal enclosure. Our ac hardwire designs incorporate Transtector’s proprietary non-degrading, fast acting, high performance silicon avalanche suppressor diodes (SASD) surge protection. Configured with visual and remote status indication, our industrial grade products protect ac load centers and power distribution systems.