... power 2)much motor protection function (as following introduction)3)easy install, free maintenance, save maintenance cost4)highly increase the motor ... limiting, over-voltage, under-voltage,over load, open-phase, 3 phase unbalance, over heat, communication fault,2.The main circuit ... reach the target of multiiple onver-voltage absorption and protection.3.It multiply limiting the clamp of transient dv/dt, ...