IEC 60335-2-34:2012 deals with the safety of sealed (hermetic and semi-hermetic type) motor-compressors, their protection and control systems, if any, which are intended for use in equipment for household and similar purposes and which conform with the standards applicable to such equipment. It applies to motor-compressors tested separately, under the most severe conditions that may be expected to occur in normal use, their rated voltage being not more than 250 V for single-phase motor-compressors and 480 V for other motor-compressors. Examples of equipment which contain motor-compressors are: - refrigerators, food freezers and ice makers (IEC 60335-2-24); - air-conditioners, electric heat pumps and dehumidifiers (IEC 60335-2-40); - commercial dispensing appliances and vending machines (IEC 60335-2-75); - factory-built assemblies for transferring heat in applications for refrigerating, air-conditioning or heating purposes or a combination of such purposes. This standard does not supersede the requirements of standards relevant to the particular appliance in which the motor-compressor is used. However, if the motor-compressor type used complies with this standard, the tests for the motor-compressor specified in the particular appliance standard may not need to be made in the particular appliance or assembly. If the motor-compressor control system is associated with the particular appliance control system, additional tests may be necessary on the final appliance. Keywords: Motor compressor, hermetic; semi-hermetic