EN 3155-029:2007

Overview

EN 3155-029:2007 is a European standard developed by CEN, specifying the product requirements for female electrical coaxial contacts used in aerospace connection elements. These contacts are shielded, size 16, type D, crimp, and class R, designed primarily for high-reliability aerospace applications with operating temperature ranges from -65°C to +150°C. This standard defines critical characteristics, testing methods, and tooling requirements to ensure consistent quality and reliable electrical performance.

EN 3155-029:2007 must be used in conjunction with the general technical specification EN 3155-001 and the list of connection elements given in EN 3155-002. It complements related male contact standards EN 3155-028 and EN 3155-038.

Key Topics

• Contact Type and Classification
  The standard covers size 16, female, shielded coaxial contacts, classified as type D with crimp termination and class R for rugged aerospace environments.

• Material and Surface Treatment
  Contacts are made from copper alloy, with a gold plating over an appropriate undercoat to ensure corrosion resistance and conductivity. The hood is stainless steel with dielectric insulation made of PTFE or equivalent material.

• Dimensions and Marking
  Precise dimensional tolerances are specified to assure interchangeability after surface treatment. Although color coding is not applicable, identification markings conform to EN 3155-001 guidelines.

• Permissible Cable Types
  Supports various cable groups including WK, WS, XY, WL, and WG, with specific cable diameters and insulation stripping dimensions detailed for correct assembly.

• Crimping and Tooling
  Requires use of approved crimping tools conforming to MIL-DTL-22520 and corresponding positioners. Detailed stripping procedures and crimp sequences are specified to ensure reliable cable termination.

• Testing Requirements
  A thorough battery of tests under EN 2591 series includes electrical resistance measurements, insulation resistance, voltage proof, mechanical endurance, vibration, shock, and environmental resistance (salt mist, ozone, fluid resistance). These tests validate contact performance under simulated aerospace operating conditions.

• Gauge and Insertion/Extraction Forces
  Specific gauge dimensions and force limits for insertion and extraction ensure consistent mechanical behavior during assembly and maintenance.

• Packaging and Marking for Delivery
  Contacts are individually packaged with manufacturer identification, part designation, and production date codes to maintain traceability.

Applications

EN 3155-029:2007 contacts are specifically designed for:

• Aerospace Electrical Connectivity
  Ensuring robust, shielded coaxial signal transmission in aircraft systems subject to extreme temperatures and mechanical stresses.

• High-Reliability Defense Systems
  Applications where dependable electrical connections with stable impedance and minimal noise are critical.

• Avionics and Communication Equipment
  Facilitating effective shielding and precise impedance matching in coaxial cable assemblies for sensitive electronic components.

• Industrial and Space Environments
  Where adherence to stringent environmental and mechanical standards is necessary to withstand vibration, shock, and corrosion.

These contacts play a vital role in preventing signal degradation and maintaining system integrity across demanding aerospace infrastructures.

Related Standards

• EN 3155-001 – Technical specification for electrical contacts used in connection elements (foundation document).
• EN 3155-002 – List and utilization of contacts applied in aerospace connectors.
• EN 3155-028 & EN 3155-038 – Product standards defining related male coaxial contacts, complementary to this female contact standard.
• MIL-DTL-22520 – Military specification governing crimping tools for wire termination, referenced for tooling compliance.
• EN 2591 – Aerospace test methods for electrical and optical connections, used to define test protocols.
• EN 2083 – Copper conductor standards suitable for aerospace cable construction.
• EN 3682-001 – Technical specs for aerospace rectangular connectors, addressing mating conditions relevant to these contacts.

By adhering to EN 3155-029:2007, manufacturers and aerospace engineers ensure high-quality, reliable electrical coaxial contacts with appropriate mechanical and environmental endurance - crucial for mission-critical aerospace systems requiring uncompromising connectivity standards.