oSIST prEN 3661-001:2020
(Main)Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A - Part 001: Technical specification
Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A - Part 001: Technical specification
This document specifies the single-pole temperature compensated circuit breakers with signal contacts, polarized or not, rated from 20 A to 50 A and used in aircraft on-board circuits. It describes specific environmental, electrical and mechanical characteristics and the stringency of tests to be applied according to test methods of EN 3841-100.
These circuit breakers are intended for use in aircraft with electrical supplies in accordance with EN 2282 (all categories).
Luft- und Raumfahrt - Schutzschalter, einpolig, temperaturkompensiert, Nennströme von 20 A bis 50 A - Teil 001: Technische Lieferbedingungen
Série aérospatiale - Disjoncteurs unipolaires compensés en température, intensités nominales 20 A à 50 A - Partie 001 : Spécification technique
Le présent document spécifie les disjoncteurs unipolaires compensés en température avec contacts de signalisation, polarisés ou non, à intensité nominale de 20 A à 50 A, utilisés dans les circuits embarqués des aéronefs. Il décrit les caractéristiques d'environnement, électriques et mécaniques spécifiques, et la rigueur des essais à appliquer conformément aux méthodes d’essais de l’EN 3841-100.
Ces disjoncteurs sont destinés à être utilisés à bord des aéronefs avec une alimentation électrique conforme à l’EN 2282 (toutes catégories).
Aeronavtika - Odklopniki, enopolni, temperaturno kompenzirani, nazivni toki od 20 A do 50 A - 001. del: Tehnična specifikacija
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 3661-001:2020
01-november-2020
Aeronavtika - Odklopniki, enopolni, temperaturno kompenzirani, nazivni toki od 20
A do 50 A - 001. del: Tehnična specifikacija
Aerospace series - Circuit breakers, single-pole, temperature compensated, rated
currents 20 A to 50 A - Part 001: Technical specification
Luft- und Raumfahrt - Schutzschalter, einpolig, temperaturkompensiert, Nennströme von
20 A bis 50 A - Teil 001: Technische Lieferbedingungen
Série aérospatiale - Disjoncteurs unipolaires compensés en température, intensités
nominales 20 A à 50 A - Partie 001 : Spécification technique
Ta slovenski standard je istoveten z: prEN 3661-001
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
oSIST prEN 3661-001:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN 3661-001:2020
---------------------- Page: 2 ----------------------
oSIST prEN 3661-001:2020
DRAFT
EUROPEAN STANDARD
prEN 3661-001
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS Will supersede EN 3661-001:2006
English Version
Aerospace series - Circuit breakers, single-pole,
temperature compensated, rated currents 20 A to 50 A -
Part 001: Technical specification
Série aérospatiale - Disjoncteurs unipolaires Luft- und Raumfahrt - Schutzschalter, einpolig,
compensés en température, intensités nominales 20 A temperaturkompensiert, Nennströme von 20 A bis 50
à 50 A - Partie 001 : Spécification technique A - Teil 001: Technische Lieferbedingungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3661-001:2020 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 3661-001:2020
prEN 3661-001:2020 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Description . 6
5 Design . 6
5.1 Materials . 6
5.1.1 Metallic materials . 6
5.1.2 Insulation materials . 6
5.2 Design . 6
5.2.1 Insulating box . 6
5.2.2 Free release mechanism . 6
5.2.3 Attachment . 6
5.2.4 Electrical connection units . 6
5.2.5 Control actuator . 6
5.2.6 Rating inviolability . 7
5.2.7 Leakage lines . 7
5.2.8 Protection against non-release . 7
6 Characteristics . 7
6.1 General characteristics . 7
6.2 Ratings . 8
6.3 Nominal voltage of main contacts . 8
6.4 Signal contact performances. 8
6.5 Dimensional characteristics . 8
6.6 Recommended panel mounting dimensions . 8
7 Tests . 9
7.1 Mechanical tests . 9
7.2 Environmental tests . 10
7.3 Electrical tests . 15
8 Qualification tests . 17
8.1 Sampling . 17
8.2 Material tests . 20
8.3 Periodic checks for qualification maintenance . 20
9 Quality assurance . 20
10 Marking . 20
11 Delivery conditions . 20
12 Packaging . 21
13 Storage . 21
13.1 Definition . 21
13.2 Storage conditions . 21
2
---------------------- Page: 4 ----------------------
oSIST prEN 3661-001:2020
prEN 3661-001:2020 (E)
13.3 Storage duration . 21
Bibliography . 22
3
---------------------- Page: 5 ----------------------
oSIST prEN 3661-001:2020
prEN 3661-001:2020 (E)
European foreword
This document (prEN 3661-001:2020) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 3661-001:2006.
4
---------------------- Page: 6 ----------------------
oSIST prEN 3661-001:2020
prEN 3661-001:2020 (E)
1 Scope
This document specifies the single-pole temperature compensated circuit breakers with signal contacts,
polarized or not, rated from 20 A to 50 A and used in aircraft on-board circuits. It describes specific
environmental, electrical and mechanical characteristics and the stringency of tests to be applied
according to test methods of EN 3841-100.
These circuit breakers are intended for use in aircraft with electrical supplies in accordance with EN 2282
(all categories).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2083, Aerospace series - Copper and copper alloys conductors for electrical cables - Product standard
EN 2282, Aerospace series - Characteristics of aircraft electrical supplies
EN 2825, Aerospace series - Burning behaviour of non metallic materials under the influence of radiating
heat and flames - Determination of smoke density
EN 2826, Aerospace series - Burning behaviour of non metallic materials under the influence of radiating
heat and flames - Determination of gas components in the smoke
EN 3841 (series), Aerospace series — Circuit breakers — Test Methods
EN 3844-1, Aerospace series - Flammability of non-metallic materials - Part 1: Small burner test, vertical -
Determination of the vertical flame propagation
1)
TR 6083 , Aerospace series — Cut-outs for installation of electrical components
2)
MIL-I-81969/1A , Installing and removal tools, connector electrical contact, type III, class 2,
composition C
2)
MIL-I-81969/14C , Installing and removal tools, connector electrical contact, type III, class 2,
composition B
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 3841-100 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at http://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
1)
Published as ASD-STAN Technical Report at the date of publication of this document by AeroSpace and Defence
industries Association of Europe — Standardization (ASD-STAN), http://www.asd-stan.org/.
2)
Published by: Department of Defense (DOD), the Pentagon, Washington D.C. 20301 USA.
5
---------------------- Page: 7 ----------------------
oSIST prEN 3661-001:2020
prEN 3661-001:2020 (E)
4 Description
These circuit breakers are operated by a “push-pull” type single push button (actuator) and with delayed
action “trip-free” tripping. Their function is ensured up to the short-circuit current.
5 Design
5.1 Materials
5.1.1 Metallic materials
All metallic parts shall be resistant to corrosion or finished against corrosion. When dissimilar materials
are in close contact, an adequate protection against corrosion shall be used so that the electromotive
force of the galvanic couple does not exceed 0,25 V.
When bimetals are used, an eventual corrosion shall not affect the good operation of the circuit breaker.
5.1.2 Insulation materials
The insulating parts shall be made of auto-extinguishing or non-flammable materials; they shall not emit
damaging or explosive vapours, even in presence of fire or internal electric arc.
They shall be insensitive to moulds and microorganisms action.
Application of any material or protective coating, which might crack, break or flake shall be forbidden.
Materials which are not specified, or which are not specially described shall be as light as possible for the
requested use.
Materials shall be selected according to security criteria (toxicity, smoke density) as defined in
contractual documents.
5.2 Design
5.2.1 Insulating box
The insulating box shall integrate besides the mechanism, the connection and attachment unit.
5.2.2 Free release mechanism
Design of circuit breaker mechanism shall allow free release, i.e. the circuit breaker cuts out in case of
overload, and remains cut out even if the actuator is kept by force in engaged position.
A new engagement of circuit breaker is only possible after a first total release of the control actuator.
The operation in these conditions shall not affect further performances of the circuit breaker.
5.2.3 Attachment
All visible parts shall be black coloured and non-reflective.
5.2.4 Electrical connection units
They shall be able to receive the lugs (or contacts).
5.2.5 Control actuator
In engaged position, the visible part of the control actuator shall be of the colour stated in the product
standard. In disengaged (or opened) position, the control actuator shall show a white strip.
The outer part of this actuator shall be isolated from all undervoltage parts.
6
---------------------- Page: 8 ----------------------
oSIST prEN 3661-001:2020
prEN 3661-001:2020 (E)
The control actuator shall not stay in a transition position or give a false indication about the circuit
breaker condition. It shall not be removable.
When pushing it, power contacts of the circuit breaker engage and indicating contact opens.
When pulling it, power contacts of the circuit breaker open and indicating contact closes.
The circuit breaker rating is indicated in indelible white colour on the front part of the control actuator.
The product standard gives the digits positioning.
5.2.6 Rating inviolability
The circuit breaker shall be designed in such a way that the calibration unit cannot be reached without
breaking a sealing.
5.2.7 Leakage lines
The leakage lines and the minimal space to be foreseen between the undervoltage parts and any other
part of the circuit breaker made of non-insulating material, as well as between the undervoltage parts of
opposite polarity, shall be sufficient to avoid any default or arc tracking in all uses and climatic conditions.
5.2.8 Protection against non-release
Electrical overload happening on a circuit breaker locked in its engaged position (sticked contacts or non-
operating release mechanism), shall cause the opening of the circuit by circuit breaker destruction
without any fire or important smoke release.
6 Characteristics
6.1 General characteristics
See Table 1.
Table 1 — General characteristics
Designation Requirements
Assembly See product standard.
Mass See product standard.
Operational altitude See product standard.
Power contact connection
1 (one) input terminal on power supply side
See product standard.
(identified by digit 1)
1 (one) output terminal on distribution side
(identified by digit 2)
Signal contact connection, circuit closed Crimp contacts size 20
when circuit breaker is on release See product standard.
Operational ambient temperatures limits From −55 °C to 125 °C
From −55 °C to 125 °C
Temperature compensation
See product standard.
Rating marking On control actuator (indelible white)
7
---------------------- Page: 9 ----------------------
oSIST prEN 3661-001:2020
prEN 3661-001:2020 (E)
6.2 Ratings
See product standard.
6.3 Nominal voltage of main contacts
See product standard.
6.4 Signal contact performances
See Table 2.
Table 2
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.