“Full Mode Protection” means the SPD provides surge suppression between all possible combinations of conductors in the power system, including:

  • L-N (Line-to-Neutral)

  • L-G (Line-to-Ground)

  • N-G (Neutral-to-Ground)

  • L-L (Line-to-Line, for split-phase or three-phase systems)

Implementing full mode protection is a best practice because transient overvoltages can occur between any conductor combination. Most Prosurge panel SPD series (e.g., PSP C, HPSP, PS) offer a full mode protection option to ensure comprehensive protection. To accommodate different power distribution systems (e.g., delta systems without a neutral), Prosurge also provides customizable protection modes (e.g., L-G, L-L only).