Phase failure protection relay TH-217 It functions for protecting a pahse sequence, phase loss,three - ... unbalance. New ProductsPhase failure protection relayTH-217,TH-215,TH-201,TH-210 Application: TH-217 Open-Phase Protector adopts the advanced ... sequence, phase loss, and three-phase unbalance. Technical Parameter:TypeTH-217,TH-215,TH-201,TH-210Contact ratingAC250V,DC30V,8ARated voltageThree ...