EN 3646-002:2026

Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements

This document specifies the performances and contact arrangements groups for bayonet coupling circular connectors, intended for use in an operating temperature range of −65 °C to 175 °C or 200 °C continuous.

Luft- und Raumfahrt - Elektrische Rundsteckverbinder mit Bajonettkupplung, Betriebstemperatur 175 °C oder 200 °C konstant - Teil 002: Leistungsdaten und Kontaktanordnungen

Dieses Dokument legt die Leistungsdaten und Gruppen von Kontaktanordnungen für Rundsteckverbinder mit Bajonettkupplung fest, die für den Einsatz in einem Betriebstemperaturbereich von −65 °C bis 175 °C oder 200 °C konstant vorgesehen sind.

Série aérospatiale - Connecteurs électriques circulaires à accouplement par baïonnettes, température d'utilisation 175 °C ou 200 °C continu - Partie 002 : Spécification de performances et d'arrangements des contacts

Le présent document spécifie les performances et les groupes d’arrangements de contacts des connecteurs circulaires à accouplement par baïonnettes, destinés à une utilisation dans une plage de températures comprises entre −65 °C et 175 °C ou 200 °C continu.

Aeronavtika - Konektorji, električni, okrogli, bajonetno sklapljanje, stalna delovna temperatura 175 °C ali 200 °C - 002. del: Specifikacija lastnosti in razporeditev kontaktov

Ta dokument določa zmogljivosti in skupine razporeditev kontaktov za okrogle konektorje z bajonetnim spojem, namenjene za uporabo v temperaturnem območju delovanja od −65 °C do 175 °C ali 200 °C neprekinjeno.

General Information

• Status: Published
• Publication Date: 24-Feb-2026
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2/S 3 - Elements of Connection (Connectors, Contacts, rear accessories, crimping tools
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 25-Feb-2026
• Completion Date: 25-Feb-2026
• Ref Project: SIST EN 3646-002:2026 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements

Relations

• Replaces: EN 3646-002:2007 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements
• Effective Date: 26-Jul-2023
• Refers: EN 2591-209:1996 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 209: Current temperature derating
• Effective Date: 18-Mar-2026
• Refers: EN 3197:2010 - Aerospace series - Design and installation of aircraft electrical and optical interconnection systems
• Effective Date: 18-Mar-2026
• Refers: EN 4529-002:2019 - Aerospace series - Elements of electrical and optical connection - Sealing plugs - Part 002: Index of product standards
• Effective Date: 18-Mar-2026
• Refers: EN 3646-004:2026 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 004: Receptacle, jam-nut mounting - Product standard
• Effective Date: 18-Mar-2026
• Refers: EN 3646-003:2018 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 003: Receptacle, square flange mounting - Product standard
• Effective Date: 04-Mar-2026
• Refers: EN 3646-009:2015 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 009: Protective cover for receptacle - Product standard
• Effective Date: 04-Mar-2026
• Refers: EN 3646-011:2006 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 011: Dummy receptacle - Product standard
• Effective Date: 04-Mar-2026
• Refers: EN 3646-005:2017 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 005: Receptacle, hermetic, square flange mounting - Product standard
• Effective Date: 04-Mar-2026
• Refers: EN 3646-001:2015 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 001: Technical specification
• Effective Date: 04-Mar-2026
• Refers: EN 3646-010:2015 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 010: Protective cover for plug - Product standard
• Effective Date: 04-Mar-2026
• Refers: EN 3646-008:2006 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 008: Plug - Product standard
• Effective Date: 04-Mar-2026
• Refers: EN 3646-007:2015 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 007: Receptacle, hermetic, round flange, welding or brazing mounting - Product standard
• Effective Date: 04-Mar-2026
• Referred By: EN 3646-006:2026 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 006: Receptacle, hermetic, jam-nut mounting - Product standard
• Effective Date: 18-Mar-2026
• Referred By: EN 3660-002:2016 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 002: Index of product standards
• Effective Date: 04-Mar-2026

Overview

EN 3646-002:2026 is a European standard developed by CEN for the aerospace industry, specifying the performance requirements and contact arrangements for circular electrical connectors featuring bayonet coupling. These connectors are designed to withstand continuous operating temperatures of -65 °C up to either 175 °C or 200 °C, making them highly suitable for demanding aerospace and military environments. The standard ensures consistent performance, reliability, and interoperability of bayonet coupling circular connectors used in a variety of electrical systems in aircraft and space applications.

Key Topics

• Connectors covered: Circular, bayonet coupling, sealed and hermetic types, including different finishes for corrosion resistance and specific maximum operating temperatures (175 °C or 200 °C).
• Contact arrangements: Detailed grouping of contact sizes (12, 16, 20) and pin counts, supporting a wide range of connection configurations.
• Performance characteristics:
  • Electrical properties: Insulation resistance (minimum 5,000 MΩ at ambient), withstand voltage at various altitudes, and rated current values referencing EN 2591-209.
  • Mechanical durability: Endurance of 250 to 500 mating cycles, depending on connector class.
  • Environmental resistance: Corrosion and fluid resistance per EN 3646-001, and high shielding effectiveness for robust signal integrity.
• Operating Conditions:
  • Wide operating temperature range (-65 °C to 200 °C).
  • Compatibility with cables of specified diameters and tooling as defined in referenced standards.
• Accessory Components: Guidance for protective covers, dummy receptacles, sealing plugs, and rear accessories to ensure system integrity and flexibility.

Applications

EN 3646-002:2026 connectors are widely used in aerospace and military electrical systems where robust, reliable, and environmentally resistant connections are critical. Common applications include:

• Aircraft wiring harnesses: Secure and reliable connection of electrical circuits in avionics and airframe systems.
• Spacecraft systems: Suitable for satellites and launch vehicles due to high temperature and mechanical resilience.
• Defense electronics: Used in military vehicles and equipment requiring quick, positive locking via bayonet coupling mechanisms.
• Industrial environments: High-durability connectors meeting similar temperature and vibration demands in railway, robotics, or energy installations.

Related Standards

Several other standards complement EN 3646-002:2026 to ensure a complete system approach for connector specification, installation, and performance:

• EN 3646-001: Technical specification for the connector family.
• EN 3197: Design and installation of aircraft electrical and optical interconnection systems.
• EN 3155-002: Lists and defines electrical contacts used within connectors.
• EN 2591-209: Test methods for current temperature derating.
• EN 4529-002: Sealing plugs for contact cavities.
• EN 3660-002: Cable outlet accessories for electrical connectors.
• MIL-DTL-26482 (Referenced): U.S. military specification for similar miniature circular connectors.
• NAS 1599 (Referenced): Historical specification for rugged connectors in aerospace.

For detailed requirements and product selection, users should reference EN 3646-002:2026 alongside these related documents to ensure compatibility and compliance with the latest aerospace connector standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Aeronavtika - Konektorji, električni, okrogli, bajonetno sklapljanje, stalna delovna
temperatura 175 °C ali 200 °C - 002. del: Specifikacija lastnosti in razporeditev
kontaktov
Aerospace series - Connectors, electrical, circular, bayonet coupling, operating
temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and
contact arrangements
Luft- und Raumfahrt - Elektrische Rundsteckverbinder mit Bajonettkupplung,
Betriebstemperatur 175 °C oder 200 °C konstant - Teil 002: Leistungsdaten und
Kontaktanordnungen
Série aérospatiale - Connecteurs électriques circulaires à accouplement par baïonnettes,
température d'utilisation 175 °C ou 200 °C continu - Partie 002: Spécification de
performances et arrangements des contacts
Ta slovenski standard je istoveten z: EN 3646-002:2026
ICS:
31.220.10 Vtiči in vtičnice, konektorji Plug-and-socket devices.
Connectors
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3646-002
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2026
EUROPÄISCHE NORM
ICS 49.060 Supersedes EN 3646-002:2007
English Version
Aerospace series - Connectors, electrical, circular, bayonet
coupling, operating temperature 175 °C or 200 °C
continuous - Part 002: Specification of performance and
contact arrangements
Série aérospatiale - Connecteurs électriques circulaires Luft- und Raumfahrt - Elektrische Rundsteckverbinder
à accouplement par baïonnettes, température mit Bajonettkupplung, Betriebstemperatur 175 °C oder
d'utilisation 175 °C ou 200 °C continu - Partie 002 : 200 °C konstant - Teil 002: Leistungsdaten und
Spécification de performances et d'arrangements des Kontaktanordnungen
contacts
This European Standard was approved by CEN on 3 November 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3646-002:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Description and codification of class . 6
5 Technical specification . 7
6 Operating conditions . 7
6.1 Combinations of plugs and receptacles . 7
6.2 Combinations of protective covers and connectors . 7
6.3 Permissible cables . 7
6.4 Operating characteristics . 8
6.4.1 Electrical conditions . 8
6.4.2 Climatic conditions . 9
6.4.3 Mechanical conditions . 9
7 Type codes . 10
8 Polarization . 10
9 Housing sizes and contact arrangements. 10
10 Contacts . 19
11 Filler plugs . 19
12 Rear accessories . 19
13 Tooling . 19
14 Assembly and wiring instructions . 19
Bibliography . 20
European foreword
This document (EN 3646-002:2026) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2026, and conflicting national standards shall be
withdrawn at the latest by August 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 3646-002:2007.
EN 3646-002:2007:
— update of normative references;
— editorial revision of the document.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
This family of connectors is derived from MIL-DTL-26482 series 2, the NAS 1599 bayonet connector with
which it is intermateable.
1 Scope
This document specifies the performances and contact arrangements groups for bayonet coupling
circular connectors, intended for use in an operating temperature range of −65 °C to 175 °C or 200 °C
continuous.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2591-209, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 209: Current temperature derating
EN 3197, Aerospace series — Design and installation of aircraft electrical and optical interconnection
systems
EN 3646-001, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 001: Technical specification
EN 3646-003, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 003: Receptacle, square flange mounting — Product standard
EN 3646-004, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 004: Receptacle, jam-nut mounting — Product standard
EN 3646-005, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 005: Receptacle, hermetic, square flange mounting — Product standard
EN 3646-006, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 006: Receptacle, hermetic, jam-nut mounting — Product standard
EN 3646-007, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 007: Receptacle, hermetic, round flange, welding or brazing
mounting — Product standard
EN 3646-008, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 008: Plug — Product standard
EN 3646-009, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 009: Protective cover for receptacle — Product standard
EN 3646-010, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 010: Protective cover for plug — Product standard
EN 3646-011, Aerospace series — Connectors, electrical, circular, bayonet coupling, operating temperature
175 °C or 200 °C continuous — Part 011: Dummy receptacle — Product standard
EN 4529-002, Aerospace series — Elements of electrical and optical connection — Sealing plugs —
Part 002: Index of product standards
...