IEC 61010-2-051:2015 is applicable to electrically operated laboratory equipment and its accessories for mechanical mixing and stirring, where mechanical energy influences the shape or size or homogeneity of materials and their accessories. Such devices may contain heating elements. It has the status of a group safety publication in accordance with IEC Guide 104. This third edition cancels and replaces the second edition published in 2003. It constitutes a technical revision and includes the following change from the second edition: - exclusion of equipment, whose size and weight make unintentional movement unlikely, from the drop test in Clause 8, - added requirement for interlock systems containing electric/electronic or programmable components to Clause 15, - notes have been re-phrased according to ISO/IEC Directives. This publication is to be read in conjunction with IEC 61010-1:2010.