IEC 61811-10 pdf download.Electromechanical elementary relays of assessed quality 1 General 1.1 Scope This part of IEC 61811 is a sectional specification applicable to electromechanical elementary (non-specified time all-or-nothing) relays of assessed quality for industrial application. NOTE Electromechanical all-or-nothing telecom relays of assessed quality are covered by IEC 61811-50. It is based on the basic relay standard IEC 61810-1 as...