IEC 61535:2019 is available as IEC 61535:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61535:2019 applies to two-wire, up to five-wire installation couplers, including earth, if provided, with a rated voltage up to and including 500 V AC or DC and a rated connecting capacity up to and including 10 mm2 for permanent connection in electrical installations. Installation couplers with additional contacts for voltages other than mains voltages are outside the scope of this document. This second edition cancels and replaces the first edition published in 2009 and Amendment 1:2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - enlargement of the scope to DC application; - addition of further requirements as regards DC application (marking, etc.), no additional test procedures were deemed necessary; however some modifications were necessary in the normative text; - changes and enhancement of the field of application of installation couplers into outdoor applications; - addition of a suitable temperature range; - updating of the list of normative references, modified to undated references, where possible.