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Schematic symbols for male and female connector pins. In electrical and mechanical trades and manufacturing, each half of a pair of mating connectors or fasteners is conventionally designated as male or female, [1] a distinction referred to as its gender. [2] The female connector is generally a receptacle that receives and holds the male connector.
The male shield has two keys projecting inwards, which fit into notches in the female body. The larger key is at right angles to the pins, 2.0 ± 0.1 mm (0.079 ± 0.004 in) wide and ending at a radius of 4.9 ± 0.1 mm (0.193 ± 0.004 in) from the connector centre.
1 = Male; 2 = Female; 9 = Not applicable. The standard specifies that its use may be referred to by the designator "SEX". The standard explicitly states that no significance is to be placed on the encoding of male as 1 and female as 2; the encoding merely reflects existing practice in the countries that initiated this standard. The standard ...
This is surrounded by a circular shroud on the male connector, which fits into a matching recess on the female connector. The standard defines connectors with 3, 4 and 5 pins, but a non-standard variant with 7 pins (6 in a circle plus one in the centre) is commercially available; [ 6 ] this can be used for star-delta starting of three-phase motors.
Generally, 6-series non-locking plugs are used for such appliances as large room air conditioners and commercial kitchen equipment; the occasional home arc welder also uses 6-50. [25] Single-phase 6-50 is commonly used on farms for silo unloaders, and is used with a 6-gauge flexible power cord up to 200 ft (61 m) long.
Three phase sockets provide three line contacts, they may also include either or both of a neutral and protective earth contact. The designations of the three contacts may vary. The IEC standards use the Line designations L1, L2 and L3. [15] NEMA standards use the Phase designations X, Y and Z. [16]