Historical
IEC 61076-2-101 Ed. 1.0 b:2004
Connectors for electronic equipment - Part 2-101: Circular connectors - Detail specification for circular connectors M8 with screw- or snap-locking, M12 with screw-locking for low voltage applications"
Describes circular connectors for use in industrial control circuits devices like switchgear and controlgear. These connectors consist of fixed and free connectors either rewireable or non-rewireable, M8 with screw-locking or 8 mm diameter with snap-locking, M12 with screw-locking.
International Electrotechnical Commission [iec]