... in power system with AC 50Hz, rate operation voltage up to 660V and 1000V, in main circuit, current from 0. 1A ... to 630A. It is used to protect AC three-phase asynchronous motor against overload ... 3UA66400100080~125, 125~200, 180~250, 200~320, 250~4003UA686301000320~500, 400~630 TO supply Siemens relay 3UA50-58