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Socapex is a brand of electrical connectors, known in the entertainment industry primarily for their 19-pin electrical connectors, commonly known as Socapex connectors, and used in film, television, and stage lighting to terminate the ends of a multicable. They are wired with six hot/live pins, six neutral pins, six ground/earth pins, and a final central pin used to aid alignment of the male end of the connector with a female receptacle. The Socapex was first created by a company called Socapex in 1961, which later on became Amphenol Socapex. "Socapex" became a brand name owned by Amphenol Socapex, the term is now often applied to similar off-brand connectors as a genericized trademark.
"Breakouts" are often used to connect fixtures to the cable. The breakout consists of a male Socapex connector with six "tails" with female parallel blade receptacle, stage pin connector, IEC 60309 16 A, NEMA L5-20P 'twist-lock', BS 546 15 A or Schuko connectors, according to the standards of the region in which the assembly is being used. A "breakin" is the opposite, consisting of "tails" with male Parallel Blade, stage pin connectors, IEC 60309 16 A, NEMA L5-20R 'twist-lock', BS 546 or Schuko connectors feeding a female socapex connector. These are used to connect Socapex cables to dimmer packs that do not have Socapex outputs. 
Some fixtures and assemblies containing several lamps, such as PARbars may use a panel mounted Socapex connector to avoid the need for a separate breakout, and many such fixtures also incorporate a female Socapex connector to allow further similar fixtures to be chained from the same supply.
Amphenol Socapex is still manufacturing and selling the original Socapex. While some companies use Socapex as a rigging motor power cable, this is generally not recommended as differences in voltage (i.e., 400 V vs. 230 V) can be misinterpreted, causing extensive equipment damage. Socapex connectors may be found on circuits connected to dimmers, or may be inadvertently fed from three-phase circuits that exceed the connector voltage rating. Some audio equipment may use Socapex connectors which must not be connected to power circuits. 
- James Moody, Paul Dexter, Concert Lighting: Techniques, Art and Business, Taylor & Francis, 2013 ISBN 1136082700 page 127
- R. Wolf, Dick Block, Scene Design and Stage Lighting. Nelson Education, 2013, ISBN 1285687507, page 467
- Nick Moran Performance Lighting Design: How to light for the stage, concerts and live events, Bloomsbury Publishing, 2014, ISBN 1408147661, chapter 2 section "Socapex multicore protocols"
- KUPO 19PIN Website
- Official Socapex Website
- Official CEEP Website
- Official P3 Lighting connectors web-site
- SES 19 pin connector web-site
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