Performs a different function than grounding requirements. Protects equipment from high voltage surges from nearby lightning strikes. Two stage protection: under 1ns-90V, over 10ns-12V. Wide range of applications: CCTV/CATV system, Antenna of Television, FM receivers, video camera, monitors, multiplexers & Quad processor, VCR...etc.
SP001 
Performs a different function than grounding requirements.