FprEN 2350

SLOVENSKI STANDARD
oSIST prEN 2350:2023
01-maj-2023
Aeronavtika - Odklopniki - Tehnična specifikacija
Aerospace series - Circuit breakers - Technical specification
Luft- und Raumfahrt - Schutzschalter - Technische Lieferbedingungen
Série aérospatiale - Disjoncteurs - Spécification technique
Ta slovenski standard je istoveten z: prEN 2350
ICS:
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
oSIST prEN 2350:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 2350:2023
oSIST prEN 2350:2023
DRAFT
EUROPEAN STANDARD
prEN 2350
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2023
ICS 49.060 Will supersede EN 2350:1990
English Version
Aerospace series - Circuit breakers - Technical
specification
Série aérospatiale - Disjoncteurs - Spécification Luft- und Raumfahrt - Schutzschalter - Technische
technique 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 2350:2023 E
worldwide for CEN national Members.

oSIST prEN 2350:2023
prEN 2350:2023 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Design . 6
4.1 Insulating housing . 6
4.2 Trip-free mechanism . 6
4.3 Mounting . 6
4.4 Electrical connection components. 6
4.5 Actuator button . 6
4.6 Calibration safety device . 6
4.7 Leakage paths . 6
4.8 Insulants . 7
4.9 Protection against corrosion . 7
4.10 Fasteners . 7
5 Tests – Requirements – Procedures – Evaluation . 7
5.1 General. 7
5.2 Mechanical tests . 8
5.2.1 Visual inspection . 8
5.2.2 Dimensions and masses . 8
5.2.3 Actuating components . 8
5.2.4 Strength of mounting . 9
5.2.5 Strength of connections . 10
5.3 Environmental tests . 10
5.3.1 Vibration performance . 10
5.3.2 Mechanical shocks . 11
5.3.3 Centrifugal acceleration . 12
5.4 Climatic environmental tests. 12
5.4.1 Sand and dust . 12
5.4.2 Corrosion test (salt spray) . 13
5.4.3 Humidity . 13
5.4.4 Resistance to explosion . 13
5.4.5 Fluid contamination . 14
5.5 Electrical tests . 15
5.5.1 Voltage drop. 15
5.5.2 Insulation resistance . 16
5.5.3 Dielectric strength . 17
5.5.4 Tripping points . 17
5.5.5 Short circuit performance . 18
5.6 Service life tests (endurance) . 20
5.6.1 Introduction . 20
5.6.2 Procedure . 20
5.6.3 Service life with overload tripping . 21
oSIST prEN 2350:2023
prEN 2350:2023 (E)
6 Qualification . 22
6.1 General conditions . 22
6.1.1 General . 22
6.1.2 Selection of samples . 22
7 Periodic tests to maintain qualification . 24
7.1 Circuit breakers . 24
7.2 Materials . 25
8 Acceptance . 25
8.1 Responsibility . 25
8.2 Tests . 25
8.2.1 General . 25
8.2.2 Evaluation. 25
9 Marking . 26
Bibliography . 27

oSIST prEN 2350:2023
prEN 2350:2023 (E)
European foreword
This document (prEN 2350:2023) 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 2350:1990.
oSIST prEN 2350:2023
prEN 2350:2023 (E)
1 Scope
This document gives design information and specifies test methods for aircraft circuit breakers covered
by European Standards. It is applicable if it is referred to in these standards.
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.
ISO 2669, Environmental tests for aircraft equipment — Steady-state acceleration
ISO 7137, Aircraft — Environmental conditions and test procedures for airborne equipment
IEC 60050-441, International electrotechnical vocabulary — Switchgear, controlgear and fuses
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-441 and the following
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/
3.1
circuit breaker with “trip-free release”
circuit breaker in which the “open” command takes precedence over the “close” command, i.e when the
electrical trip condition is reached and pressure is exerted on the depressed actuator button, the circuit
is still automatically opened
3.2
poles of a circuit breaker
denotes any main circuit from the input to the pertinent output terminal
Note 1 to entry: the parts of each current path (contact, sensors, switching parts) are independent and electrically
insulated.
Note 2 to entry: there may be 1, 2 or 3 pales independe
...