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The EN 4165 series of standards describes rectangular electrical connectors in modular design for an operating temperature of 175 °C, continuous, for aerospace applications. Part 027 defines the rack and panel rear mounted plug 2 and 4 modules, series 3 used in the family of rectangular electrical connectors. The receptacles corresponding to those plugs are defined in EN 4165-002. The protective covers corresponding to those plugs are defined in EN 4165-019. The standards of the EN 4165 series of standards are prepared by the ASD-STAN, Technical Section Electrotechnology, with the participation of German experts from DIN Standards Committee Aerospace (NL). AeroSpace and Defence Industries Association of Europe - Standardization (ASD-STAN) has been declared responsible by the European Committee for Standardization (CEN) for preparing European Standards (EN) for the aerospace sector. The responsible German standardization committee is Working Committee NA 131-04-03 AA "Electrical Connectors" at DIN Standards Committee Aerospace (NL).