IEC 61810-2:2011 covers test conditions and provisions for the evaluation of endurance tests using appropriate statistical methods to obtain reliability characteristics for relays. The main changes with respect to the previous edition are listed below: inclusion of both numerical and graphical methods for Weibull evaluation; establishment of full coherence with the second edition of the basic reliability standard IEC 61649. This publication is to be read in conjunction with IEC 61649:2008.