The ST4-1003Y2A Surge Tracker Protector from Surge Suppression Inc. is a hardwired surge protection device rated for 277/480 VAC in a four-wire configuration, intended for three-phase, four-wire power systems. It protects downstream equipment from voltage transients by diverting surge energy and clamping spikes to safe levels. Listings indicate this unit is New Old Stock in its original packaging.
