oSIST prEN 3774-001:2020
(Main)Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification
Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification
This document specifies the three-pole temperature compensated circuit breakers, rated from 1 A to 25 A 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.
Luft- und Raumfahrt - Schutzschalter, dreipolig, temperaturkompensiert, Nennströme von 1 A bis 25 A - Teil 001: Technische Lieferbedingungen
Série aérospatiale - Disjoncteurs tripolaires compensés en température, intensités nominales 1 A à 25 A - Partie 001 : Spécification technique
Le présent document spécifie les disjoncteurs tripolaires compensés en température à intensité nominale de 1 A à 25 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.
Aeronavtika - Odklopniki, tripolni, temperaturno kompenzirani, naznačeni toki od 1 A do 25 A - 001. del: Tehnična specifikacija
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 3774-001:2020
01-november-2020
Aeronavtika - Odklopniki, tripolni, temperaturno kompenzirani, naznačeni toki od 1
A do 25 A - 001. del: Tehnična specifikacija
Aerospace series - Circuit breakers, three-pole, temperature compensated, rated
currents 1 A to 25 A - Part 001: Technical specification
Luft- und Raumfahrt - Schutzschalter, dreipolig, temperaturkompensiert, Nennströme von
1 A bis 25 A - Teil 001: Technische Lieferbedingungen
Série aérospatiale - Disjoncteurs tripolaires compensés en température, intensités
nominales 1 A à 25 A - Partie 001 : Spécification technique
Ta slovenski standard je istoveten z: prEN 3774-001
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 3774-001:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 3774-001:2020
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oSIST prEN 3774-001:2020
DRAFT
EUROPEAN STANDARD
prEN 3774-001
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS Will supersede EN 3774-001:2014
English Version
Aerospace series - Circuit breakers, three-pole,
temperature compensated, rated currents 1 A to 25 A -
Part 001: Technical specification
Série aérospatiale - Disjoncteurs tripolaires compensés Luft- und Raumfahrt - Schutzschalter, dreipolig,
en température, intensités nominales 1 A à 25 A - temperaturkompensiert, Nennströme von 1 A bis 25 A
Partie 001 : Spécification technique - 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 3774-001:2020 E
worldwide for CEN national Members.
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oSIST prEN 3774-001:2020
prEN 3774-001:2020 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Description . 4
5 Design . 5
5.1 Materials . 5
5.1.1 Metallic materials . 5
5.1.2 Insulation materials . 5
5.2 Design . 5
5.2.1 Insulating box . 5
5.2.2 Free release mechanism . 5
5.2.3 Attachment . 5
5.2.4 Electrical connection units . 5
5.2.5 Control actuator . 5
5.2.6 Rating inviolability . 6
5.2.7 Clearances and creepage distances . 6
5.2.8 Protection against non-release . 6
6 Characteristics . 6
6.1 General characteristics . 6
6.2 Ratings . 6
6.3 Nominal voltage of operational circuits . 6
6.4 Dimensional characteristics . 6
6.5 Recommended panel mounting dimensions . 7
7 Tests . 7
7.1 Mechanical tests . 7
7.2 Environmental tests . 8
7.3 Electrical tests . 13
8 Qualification tests . 15
8.1 Sampling . 15
8.2 Material tests . 19
8.3 Periodic checks for qualification maintenance . 19
9 Quality assurance . 19
10 Marking . 19
11 Delivery conditions . 19
12 Packaging . 19
13 Storage . 19
13.1 Definition . 19
13.2 Storage conditions . 19
13.3 Storage duration . 20
Bibliography . 21
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oSIST prEN 3774-001:2020
prEN 3774-001:2020 (E)
European foreword
This document (prEN 3774-001:2020) 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 3774-001:2014.
3
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oSIST prEN 3774-001:2020
prEN 3774-001:2020 (E)
1 Scope
This document specifies the three-pole temperature compensated circuit breakers, rated from 1 A to 25 A
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.
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 (all parts), 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
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/
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.
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/.
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oSIST prEN 3774-001:2020
prEN 3774-001:2020 (E)
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 on 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.
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.
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.
When pulling it, power contacts of the circuit breaker open.
5
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prEN 3774-001:2020 (E)
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 Clearances and creepage distances
The clearances, creepage distances and the minimal space to be foreseen between the energized parts
and any other part of the circuit breaker made of conductive material, as well as between the energized
parts of opposite polarity, shall be sufficient to avoid any default or arcing 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.
3 input terminals on power supply side
(identified by digit A1, B1, C1)
See product standard.
3 output terminals on distribution side
(identified by digit A2, B2, C2)
Operational ambient temperatures limits From −55 °C to 125 °C
Rating 1 A to 15 A From −55 °C to 125 °C
Temperature See product
compensation standard.
Rating 20 A and 25 A From −55 °C to 90 °C
Rating marking On control actuator (indelible white)
6.2 Ratings
See product standard.
6.3 Nominal voltage of operational circuits
Se
...
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