... It functions for protecting a pahse sequence, phase loss,three -phase unbalance. New ProductsPhase failure protection relayTH-217, ... control system.It functions for protecting a phase sequence, phase loss, and three-phase unbalance. Technical Parameter:TypeTH-217,TH- ... TH-201,TH-210Contact ratingAC250V,DC30V,8ARated voltageThree phase or Three phase four-wire:AC110V 220V 380V 50HzOutput contactSPDT(2 ...