IEC 61811-54 pdf download.Electromechanical all-or-nothing relays (1) The name of the national standards organization under whose authority the detail specifi- cation is published and, if applicable, the organization from whom the detail specification is available. (2) The IECQ symbol and the number allotted to the completed detail specification by the IECQ secretariat. (3) The number and the year of availability...