SIST EN 3646-009:2015

Overview

SIST EN 3646-009:2015 is a European Standard published by CEN that specifies the characteristics of protective covers for receptacles within the aerospace series of electrical connectors. These connectors are circular with bayonet coupling and designed to operate continuously at high temperatures of 175 °C or 200 °C. This product standard provides requirements for protective covers used in extreme environmental conditions typically encountered in aerospace applications. It applies specifically to models outlined in the standard’s Table 2 and complements related receptacle standards EN 3646-003 through EN 3646-007.

Key Topics

• Scope and Application: Defines protective covers for receptacles with high operating temperature ranges between –65 °C to either 175 °C or 200 °C continuously.
• Materials and Construction: Covers are manufactured from materials such as anodized aluminum alloys (black or nickel-plated) or cadmium-plated aluminum alloys for optimum durability and thermal resistance. Accessories like chains and fasteners are made from stainless steel, brass, or aluminum to withstand harsh aerospace environments.
• Dimensions and Tolerances: Detailed dimensional requirements and tolerances ensure compatibility with corresponding connector receptacles. Precise mechanical interfaces are provided for reliable bayonet coupling.
• Attachment Types: Various attachment options include chains or PTFE-jacketed ropes with eyelets or rings to securely fasten the cover and prevent loss during maintenance.
• Marking Requirements: Sets standards for manufacturer identification, part numbers, production date, and branding on both product and packaging for traceability and quality assurance.
• Designation System: A structured code provides clear identification of protective cover models, attachment types, and housing sizes to streamline procurement and specification.

Applications

SIST EN 3646-009:2015 protective covers are critical components in:

• Aerospace Electrical Systems: Providing environmental protection to circular bayonet coupling connectors exposed to high temperatures and mechanical stress.
• Defence and Space Industries: Ensuring electrical connector receptacles maintain integrity and safety during missions where temperature extremes and contamination risk are high.
• Maintenance and Repair Operations: Offering secure and temperature-resistant protective caps to safeguard connector interfaces when disconnected or stored.
• High-Temperature Environments: Suitable for use in aircraft, spacecraft, and other vehicles or systems where electrical connectors face continuous exposure to temperatures up to 200 °C.

Related Standards

SIST EN 3646-009:2015 forms part of a harmonized series covering various aspects of aerospace circular electrical connectors with bayonet coupling. Key related documents include:

• EN 3646-001: Technical specification for electrical circular connectors operating at 175 °C or 200 °C.
• EN 3646-002: Defines performance specifications and contact arrangements.
• EN 3646-003 to EN 3646-007: Product standards for different types of receptacles (square flange, jam-nut, hermetic, welding or brazing mountings).

Implementing these standards together ensures compatibility and reliability across connector components, streamlining design, manufacturing, and certification processes in aerospace electrical systems.

Keywords: EN 3646-009 standard, aerospace connector protective cover, electrical circular connectors, bayonet coupling, high-temperature connectors, protective cover for receptacle, aerospace connector standards, CEN aerospace standards, electrical connector accessories, aerospace temperature-resistant covers.