Its primary purpose is to act as a Transient Voltage Surge Suppressor (TVSS) for industrial 3-phase electrical systems. It protects equipment from electrical spikes.
The P4003D is designed for:
3-phase 400–420V electrical systems
CNC machines
Industrial controls
Sensitive electronics
Motor drives and automation equipment.
The Psytronics P4003D retails for over $1500.