Square D TVS1HWA10X 120/240VAC Single Phase Surge Protection Device Manufacturer Part Number TVS1HWA10X. This is a Square D surge protection device. Item Surge Protection Device. Surge Current per Phase 100 kA. Surge Current per Mode 50kA. Phase Single. System Connection Parallel. byJuly 3, 2026Last Updated on: July 5, 2026