SIST EN 3841-502:2005

Aerospace series - Circuit breakers - Test methods - Part 502: Operating forces

This standard specifies a method of verifying the operating forces of circuit breakers.
It shall be used together with EN 3841-100.

Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil 502: Betätigungskräfte

Série aérospatiale - Disjoncteurs - Méthodes d'essais - Partie 502 : Efforts de manoeuvre

Aeronavtika - Odklopniki - Preskusne metode - 502. del: Sile pri uporabi

General Information

• Status: Published
• Publication Date: 31-Mar-2005
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2005
• Due Date: 01-Apr-2005
• Completion Date: 01-Apr-2005
• Ref Project: EN 3841-502:2004 - Aerospace series - Circuit breakers - Test methods - Part 502: Operating forces

Overview

EN 3841-502:2004 - part of the Aerospace series published by CEN - specifies a standardized method for verifying the operating forces of circuit breakers used in aerospace electrical systems. Intended to be used together with EN 3841-100 (General), this test method defines how to measure the forces required to switch circuit breakers on and off so that results are repeatable and comparable against the product’s technical specification.

Key topics and requirements

• Scope: Verification of switching (operating) forces for aerospace circuit breakers.
• Measurement method:
  • Forces are measured with a suitable force gauge positioned in the line of travel of the actuator button.
  • Measurements are taken three times in each direction (operate and release).
• Result evaluation:
  • The mean value of the measurements is calculated.
  • The mean must fall within limits specified in the product’s technical specification (no numeric limits are included in this standard document).
• Normative reference: EN 3841-100, which provides general test-method requirements and context for the part 502 procedure.
• Traceability and repeatability: The method enforces consistent placement of the measuring instrument and a defined number of repetitions to improve test repeatability and data quality.

Applications

This standard is used to:

• Validate that circuit breakers meet manufacturer and regulatory operating-force requirements.
• Support production quality control, acceptance testing, and incoming inspection of aerospace electrical components.
• Provide repeatable data for design verification, reliability testing, and change control.
• Aid maintenance organizations and overhaul facilities in confirming that replacement or overhauled circuit breakers operate within required force limits.
• Serve as a referenced test method for certification bodies and procurement specifications in aerospace programs.

Who should use this standard

• Aerospace component manufacturers and design engineers
• Test laboratories and quality assurance teams
• Aircraft maintenance and overhaul organizations (MRO)
• Certification authorities and procurement specialists specifying compliance criteria

Related standards

• EN 3841-100 - Aerospace series - Circuit breakers - Test methods - Part 100: General (normative reference)
• Other parts of the EN 3841 series (for broader circuit breaker test coverage) and relevant industry specifications as required by program technical documentation.

Using EN 3841-502 helps ensure consistent, documented verification of circuit-breaker switching forces - a key attribute for electrical safety and reliable operation in aerospace environments.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2005
Aeronavtika - Odklopniki - Preskusne metode - 502. del: Sile pri uporabi
Aerospace series - Circuit breakers - Test methods - Part 502: Operating forces
Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil 502: Betätigungskräfte
Série aérospatiale - Disjoncteurs - Méthodes d'essais - Partie 502 : Efforts de
manoeuvre
Ta slovenski standard je istoveten z: EN 3841-502:2004
ICS:
49.060 /HWDOVNDLQYHVROMVND Aerospace electric
HOHNWULþQDRSUHPDLQVLVWHPL equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 3841-502
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 49.060
English version
Aerospace series - Circuit breakers - Test methods - Part 502:
Operating forces
Série aérospatiale - Disjoncteurs - Méthodes d'essais - Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil
Partie 502 : Efforts de manoeuvre 502: Betätigungskräfte
This European Standard was approved by CEN on 10 September 2004.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3841-502:2004: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Scope
...