1.Internatonal standard: IEC 2.Authoritative certificate:CCC, CE,EU, TUV & ROHS 3.Rated Voltage:660V,DC voltage 440V. 1.ApplicationLAY39-22 series button switch, adapted in AC 50HZ( or 60HZ), voltage is up to 660V and DC voltage is up to 440V, used for control, signals, reverse function in CNC machine tools, shipbuilding, textiles, printing, electrical and other equippments control circuit. ...