AS/NZS 60335.2.40:2019 deals with the safety of electric heat pumps, including sanitary hot water heat pumps, air conditioners, and dehumidifiers incorporating motor-compressors and hydronic fan coils units, their maximum rated voltages being not more than 250 V for single phase appliances and 600 V for all other appliances. Partial units are within the scope of this Standard. This Standard will supersede AS/NZS 60335.2.40:2006 17 months from the date of publication and AS/NZS 60335.2.40:2015 three years from the date of publication of this Standard (i.e. on 28 June 2022). During these periods AS/NZS 60335.2.40:2006 and AS/NZS 60335.2.40:2015 will also remain current. Regulatory authorities that reference this Standard in regulation may apply these requirements at a different time. Users of this Standard should consult with these authorities to confirm their requirements.