SIST EN 2349-310:2009

Overview

SIST EN 2349-310:2009 is a European standard developed by the AeroSpace and Defence Industries Association of Europe (ASD-STAN) and adopted by CEN. It specifies detailed requirements and test procedures for evaluating the rupture characteristics of relays and contactors used in aerospace applications. Intended to ensure high reliability and safety, this standard serves as a supplement to EN 2349-100, which covers general requirements for relays and contactors in aerospace systems.

By defining uniform test methods, SIST EN 2349-310:2009 facilitates consistent assessment of relay and contactor performance under operational electrical loads, particularly their ability to safely break circuits without damage or failure. The standard applies to aerospace electric equipment and systems, supporting manufacturers and operators in meeting stringent industry safety expectations.

Key Topics

• Scope and Applicability
  The standard applies to relays and contactors used in aerospace environments, focusing on their rupture (circuit breaking) capabilities during electrical switching under specified loads.

• Mounting and Wiring Methods
  Test samples must be mounted in still air and wired according to the wiring and load requirements defined in EN 2349-100.

• Testing Procedure Highlights

  • Operating and resting contacts are individually tested for their ability to connect, conduct, and disconnect capabilities.
  • The relay or contactor housing must be connected to earth or neutral with a fuse rated at 5% of the rated contact current (max 3 A).
  • The coil must be energized at rated voltage throughout testing.
  • Contacts are monitored for performance during connection and disconnection cycles, ensuring no voltage drop over 10% or functional defects.
  • Specific time cycles apply: connection time of 0.2 ± 0.05 seconds and disconnection time of 30 ± 1 seconds.

• Failure Criteria
  Any functional defect, fuse blowing, or voltage drop above specified limits constitutes failure. Excessive temperature rise above 75°C or sticking of contacts is also not permitted.

• Temperature Monitoring
  Temperature increases are recorded on the relay case for plug-in types or on connector bolts for screw-type connections to ensure safe operating limits.

Applications

SIST EN 2349-310:2009 is essential for organizations involved in the design, manufacturing, testing, and certification of:

• Aerospace relays and contactors used in aircraft electrical systems
• Safety-critical aerospace electric system components requiring strict switching performance
• Systems where reliable circuit breaking under load is vital for aircraft operation safety
• Aerospace component testing laboratories aiming to comply with internationally recognized standards
• Maintenance and quality assurance teams verifying in-service relay and contactor reliability

By meeting this standard, aerospace manufacturers can demonstrate compliance with rigorous electrical component safety and reliability criteria, supporting system integrity and certification processes.

Related Standards

• EN 2349-100: Aerospace series - Requirements and test procedures for relays and contactors - Part 100: General requirements
  This foundational part defines the general wiring, mounting, and performance criteria essential for the application of EN 2349-310.

• Aerospace electrical equipment standards referenced by CEN that address other aspects of relay and contactor performance such as endurance, environmental resistance, and electrical characteristics.

• International aerospace and defense standardization documents aligned with ASD-STAN recommendations, facilitating harmonized component testing and manufacturing practices across Europe.

Keywords: SIST EN 2349-310:2009, aerospace relays standard, contactor rupture testing, aerospace electrical components, relay test procedure, aerospace circuit breakers, aerospace standards, CEN aerospace standard, relay performance, contactor reliability, aerospace component testing