IEC 61020-4:1991

IEC 61020-1:2009 provides consistency in detail specifications for electromechanical switches by specifying the terminology, symbols, test methods and other necessary information. Switches covered by this specification: - are devices which open, close, or change the connection of a circuit by the mechanical motion of conducting parts (contacts); - have a maximum rated voltage of 480 V; - have a maximum rated current of 63 A. This second edition constitutes a technical revision and includes the following significant technical changes with respect to the previous edition: - The requirements of the IEC 60512 series of standards have been integrated. - Other necessary information concerning switches as specified in IEC 60512 have been implemented. The following items have been updated with respect to the first edition: - test methods were reviewed for detailed description; - the explanation for the test method of the operating force was rewritten in more detail; - the test voltage for measurement for contact bounce was reviewed; - the electrical endurance "ON" duration in the duty cycle was harmonized with IEC 61058; - the requirements for fire hazards have been deleted; - testing methods of surface mounting switches based on the Japanese industrial standard were added.