This part of IEC 61076 applies to a range of circular multi-pole connectors with or without latching device, having a nominal outer shell diameter of 19 mm, with 3 to 7 contacts (type ‘XLR’). Fixed connectors are available in both panel-mounting and printed-board mounting versions. These connectors are widely used in professional audio applications. This part of IEC 61076 establishes uniform specifications, type testing requirements and quality assessment procedures for a subfamily of circular connectors. It should be used in conjunction with the applicable sectional specification, see 1.1 of IEC 61076-2.