What is TVSS? What does it protect from?

TVSS stands for Transient Voltage Surge Suppression. TVSS devices protect equipment from short duration, high voltage events. The most common are associated with nearby lightning strikes or switching of large loads. TVSS units work by clamping voltages to a safe level before equipment is effected or destroyed. TVSS equipment does not protect against sustained over voltages, under voltages, or power interruptions.