FprEN 3774-001

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

No Scope available

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 tok od 1 A do 25 A - 001. del: Tehnična specifikacija

General Information

• Status: Not Published
• Publication Date: 08-Dec-2024
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2/S 5 - Protection Devices
• Current Stage: 5020 - Submission to Vote - Formal Approval
• Start Date: 11-Jul-2024
• Completion Date: 11-Jul-2024
• Ref Project: oSIST prEN 3774-001:2023 - Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification

Relations

• Revises: EN 3774-001:2014 - Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification
• Effective Date: 26-Feb-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2023
Aeronavtika - Odklopniki, tripolni, temperaturno kompenzirani, naznačeni tok 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:
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 3774-001
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2023
ICS 49.060 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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3774-001:2023 E
worldwide for CEN national Members.

prEN 3774-001:2023 (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 . 17
8.3 Periodic checks for qualification maintenance . 18
9 Quality assurance . 18
10 Marking . 18
11 Delivery conditions . 18
12 Packaging . 18
13 Storage . 18
13.1 Definition . 18
13.2 Storage conditions . 18
13.3 Storage duration . 19
Annex A (informative) Standard evolution form . 20
Bibliography . 21
prEN 3774-001:2023 (E)
European foreword
This document (prEN 3774-001:2023) 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 document 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.
The main changes with respect to the previous edition are as follows:
— prEN 3774-001 (P2), 02/2012 — Editorial revision of this document: g replaced by g-PK for
n
sinusoidal and low frequencies, g replaced by Grms for random.
n
prEN 3774-001:2023 (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 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- , 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
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 terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://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.

*
All parts quoted in this document.
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), https://www.asd-stan.org/.
prEN 3774-001:2023 (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 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
...