EN 2665-004:2013
(Main)Aerospace series - Circuit breakers, three-pole, temperature compensated, rated current 20 A to 50 A - Part 004: UNC thread terminals - Product standard
Aerospace series - Circuit breakers, three-pole, temperature compensated, rated current 20 A to 50 A - Part 004: UNC thread terminals - Product standard
This European Standard specifies the characteristics of three-pole circuit breakers, temperature compensated with a rated current from 20 A to 50 A, used in aircraft on-board circuits at a temperature between – 55 °C and 90 °C at an altitude of 15 000 m max.
These circuit breakers are operated by a push-pull type single pushbutton (actuator), with delayed action "trip-free" tripping
They will continue to function up to the short-circuit current.
Luft- und Raumfahrt - Schutzschalter, dreipolig, temperaturkompensiert, Nennströme von 20 A bis 50 A - Teil 004: UNC-Klemmengewinde - Produktnorm
Diese Europäische Norm legt die Eigenschaften dreipoliger Schutzschalter, temperaturkompensiert, für Nennströme von 20 A bis 50 A, zur Verwendung im Bordnetz von Flugzeugen bei Temperaturen zwischen 55 °C und 90 °C und in einer maximalen Höhe von 15 000 m fest.
Diese Schutzschalter funktionieren durch einen Druck-Zugtaster (Aktuator) mit zeitgesteuerter Freiauslösung.
Sie sind bis zum Kurzschlussstrom weiterhin funktionsfähig.
Série aérospatiale - Disjoncteurs tripolaires compensés en température, intensités nominales 20 A à 50 A - Partie 004: Bornes à filetage UNC - Norme de produit
La présente Norme européenne spécifie les caractéristiques des disjoncteurs tripolaires, compensés en température avec une intensité nominale de 20 A à 50 A, utilisés dans les circuits à bord des aéronefs à une température comprise entre – 55 C et 90 °C et à une altitude de 15 000 m max.
Ces disjoncteurs sont commandés par un seul bouton poussoir (bouton de commande) de type « push-pull » à déclenchement libre temporisé.
Leur fonctionnement est assuré jusqu’au courant de court-circuit.
Aeronavtika - Odklopniki, tripolni, temperaturno kompenzirani, za naznačene tokove od 20 A do 50 A - 004. del: UNC-navojni priključki - Standard za izdelek
General Information
- Status
- Published
- Publication Date
- 17-Dec-2013
- Withdrawal Date
- 29-Jun-2014
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 2 - Electrical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 21-Jan-2024
- Completion Date
- 21-Jan-2026
Relations
- Effective Date
- 03-Jul-2013
- Effective Date
- 28-Jan-2026
Overview
EN 2665-004:2013 is a European standard developed by CEN that defines the specifications for aerospace circuit breakers. These are three-pole, temperature-compensated devices with rated currents ranging from 20 A to 50 A. Designed specifically for aircraft onboard electrical systems, these circuit breakers operate reliably across extreme temperature variations from –55 °C to +90 °C and altitudes up to 15,000 meters. The standard focuses on circuit breakers equipped with UNC (Unified National Coarse) thread terminals and governs their mechanical, electrical, and environmental characteristics to ensure safety and performance in demanding aerospace environments.
Key features include:
- Three-pole circuit breakers with push-pull type single pushbutton actuators.
- Delayed action "trip-free" tripping mechanism.
- Capable of functioning during and after short-circuit conditions.
- Designed for operating voltages of 115/200 V AC at frequencies from 360 Hz to 800 Hz.
- Compliance with stringent aerospace environmental and mechanical endurance requirements.
Key Topics
Circuit Breaker Characteristics
- Rated Currents: From 20 A to 50 A, with precise current coding for easy identification.
- Operating Temperature Range: Between –55 °C and +90 °C, ensuring operational stability in extreme climate conditions.
- Altitude Performance: Designed to operate up to a maximum altitude of 15,000 meters, accounting for reduced air pressure.
- Trip Mechanism: Trip-free with delayed action, enhancing safety by preventing nuisance trips while ensuring quick response to faults.
- Short-Circuit Endurance: Tested to handle prospective currents up to 2,000 A RMS, ensuring reliability during fault conditions.
- Voltage Specifications: Rated for 115/200 V AC, three-phase, at frequencies of 360 Hz to 800 Hz.
Mechanical and Environmental Standards
- UNC Thread Terminals: Standardized connection hardware with recommended tightening torques for secure attachment.
- Vibration and Shock Resistance: Endures sinusoidal vibrations up to 10 gn and shocks up to 50 gn to simulate aerospace operational stresses.
- Materials and Surface Treatments: As specified in EN 2665-001, guaranteeing corrosion resistance and durability.
- Humidity and Corrosion Resistance: Comprehensive environmental testing to maintain functionality in humid or corrosive environments.
- Electrical Endurance: Minimum of 5,000 no-load and 2,500 load operations to assure long service life.
Marking and Identification
- Circuit breakers must feature clear, durable markings including manufacturer details, date codes (year and week), electrical diagrams, terminal identifications, and part numbers.
- Pushbutton color coding follows FED-STD-595B standards, aiding quick recognition and compliance.
Applications
EN 2665-004:2013 circuit breakers are critical components used in:
- Aircraft Electrical Systems: Protecting vital circuits against overloads and short circuits.
- Aerospace On-Board Power Distribution: Ensuring reliable power management in commercial, military, and space vehicles.
- High-Altitude Flight Operations: Providing fail-safe circuit protection at elevations up to 15,000 meters.
- Electrical Panels with UNC Terminal Connections: Allowing standardized installation and maintenance procedures in aerospace manufacturing and servicing.
These circuit breakers contribute to aircraft safety, operational reliability, and maintenance efficiency by satisfying stringent performance standards under harsh operating conditions.
Related Standards
- EN 2665-001: Technical specifications for three-pole, temperature-compensated circuit breakers rated 20 A to 50 A, providing foundational requirements complementary to Part 004.
- EN 2350: General aerospace series circuit breaker technical specifications covering performance and testing protocols.
- EN 3841-305: Test methods for aerospace circuit breakers, particularly for short-circuit performance evaluation.
- EN 6113: Standards for circuit breaker connecting and attachment hardware, detailing requirements for mounting and terminal connections.
- TR 6083: Provides guidance on cut-outs for electrical component installation in aerospace panels.
- FED-STD-595B: Color standards used for government procurement, relevant for marking pushbuttons and visual identification.
By adhering to EN 2665-004:2013, aerospace manufacturers and maintenance providers ensure that three-pole temperature-compensated circuit breakers with UNC thread terminals meet rigorous safety, reliability, and performance benchmarks essential for advanced aircraft electrical systems. This standard facilitates uniformity, interoperability, and regulatory compliance within the aerospace industry.
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Frequently Asked Questions
EN 2665-004:2013 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Circuit breakers, three-pole, temperature compensated, rated current 20 A to 50 A - Part 004: UNC thread terminals - Product standard". This standard covers: This European Standard specifies the characteristics of three-pole circuit breakers, temperature compensated with a rated current from 20 A to 50 A, used in aircraft on-board circuits at a temperature between – 55 °C and 90 °C at an altitude of 15 000 m max. These circuit breakers are operated by a push-pull type single pushbutton (actuator), with delayed action "trip-free" tripping They will continue to function up to the short-circuit current.
This European Standard specifies the characteristics of three-pole circuit breakers, temperature compensated with a rated current from 20 A to 50 A, used in aircraft on-board circuits at a temperature between – 55 °C and 90 °C at an altitude of 15 000 m max. These circuit breakers are operated by a push-pull type single pushbutton (actuator), with delayed action "trip-free" tripping They will continue to function up to the short-circuit current.
EN 2665-004:2013 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 2665-004:2013 has the following relationships with other standards: It is inter standard links to EN 2665-004:1999, EN 3841-305:2004. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 2665-004:2013 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Schutzschalter, dreipolig, temperaturkompensiert, Nennströme von 20 A bis 50 A - Teil 004: UNC-Klemmengewinde - ProduktnormSérie aérospatiale - Disjoncteurs tripolaires compensés en température, intensités nominales 20 A à 50 A - Partie 004 : Bornes à filetage UNC - Norme de produitAerospace series - Circuit breakers, three-pole, temperature compensated, rated current 20 A to 50 A - Part 004: UNC thread terminals - Product standard49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 2665-004:2013SIST EN 2665-004:2014en01-marec-2014SIST EN 2665-004:2014SLOVENSKI
STANDARDSIST EN 2665-004:20021DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 2665-004
December 2013 ICS 49.060 English Version
Aerospace series - Circuit breakers, three-pole, temperature compensated, rated current 20 A to 50 A - Part 004: UNC thread terminals - Product standard
Série aérospatiale - Disjoncteurs tripolaires compensés en température, intensités nominales 20 A à 50 A - Partie 004 : Bornes à filetage UNC - Norme de produit
Luft- und Raumfahrt - Schutzschalter, dreipolig, temperaturkompensiert, Nennströme von 20 A bis 50 A - Teil 004: UNC-Klemmengewinde - Produktnorm This European Standard was approved by CEN on 28 September 2013.
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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2665-004:2013 ESIST EN 2665-004:2014
They will continue to function up to the short-circuit current. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2350, Aerospace series — Circuit breakers — Technical specification EN 2665-001, Aerospace series — Circuit breakers, three-pole, temperature co
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