SIST EN 3841-507:2005

Overview

EN 3841-507:2004 - "Aerospace series - Circuit breakers - Test methods - Part 507: Mechanical shocks" is a CEN (European) standard that defines a standardized method for verifying the ability of aerospace circuit breakers to withstand mechanical shock. It is intended to be used together with EN 3841-100 (general test requirements for aerospace circuit breakers) and references ISO 7137 for environmental shock test procedures.

Key topics and technical requirements

• Scope: Verifies mechanical-shock resistance of circuit breakers used in aerospace applications.
• Referenced standards: ISO 7137 (aircraft environmental conditions and test procedures) and EN 3841-100.
• Mounting requirements:
  • Circuit breakers are mounted on a shock table per EN 3841-100 (sections 4.2 and 4.3).
  • Mounting must transmit shock pulses without absorption or introducing natural resonance.
  • Electrical connections use cable types and sections specified in EN 3841-100 (Table 1); cables attached to shock table about 100 mm from the terminals.
  • Fastening torques follow the applicable product standard.
• Test procedure:
  • Uses ISO 7137 test procedure 2.1 (mechanical shock).
  • Apply three shocks in each direction for every switch setting:
    • Closed position at 90% of rated current.
    • Open position.
  • Shock waveform: half-sine pulse of 11 ms duration; the peak acceleration value is specified in the product technical specification.
• Contact performance requirement:
  • During shock, contacts shall not close (when in open position) or not open (when in closed position) for any period ≥ 10 µs.
• Pass/fail: Final requirements are defined by the product technical specification and applicable product standard.

Practical applications and users

• Aerospace circuit breaker manufacturers: qualification and production test protocols.
• Test laboratories: implementing repeatable shock tests for component certification.
• Design and QA engineers: verifying mechanical robustness and contact reliability under shock.
• Certification bodies and OEMs: demonstrating compliance for aircraft systems and avionic equipment procurement.
• Maintenance and reliability teams: establishing acceptance criteria for overhauled or replacement breakers.

Related standards

• EN 3841-100 (Aerospace series - Circuit breakers - Test methods - Part 100: General)
• ISO 7137 (Aircraft - Environmental conditions and test procedures for airborne equipment)

Keywords: EN 3841-507, aerospace circuit breakers test methods, mechanical shocks test, ISO 7137, shock table, half-sine 11 ms, contact bounce, circuit breaker qualification.