SIST EN 2350:2024

SLOVENSKI STANDARD
01-december-2024
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: EN 2350:2024
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.

EN 2350
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2024
EUROPÄISCHE NORM
ICS 49.060 Supersedes EN 2350:1990
English Version
Aerospace series - Circuit breakers - Technical
specification
Série aérospatiale - Disjoncteurs - Spécification Luft- und Raumfahrt - Schutzschalter - Technische
technique Lieferbedingungen
This European Standard was approved by CEN on 29 April 2024.

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, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2350:2024 E
worldwide for CEN national Members.

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 . 7
4.4 Electrical connection components. 7
4.5 Actuator button . 7
4.6 Calibration safety device . 7
4.7 Leakage paths . 7
4.8 Insulants . 7
4.9 Protection against corrosion . 7
4.10 Fasteners . 7
5 Tests – Requirements – Procedures – Evaluation . 9
5.1 General. 9
5.2 Mechanical tests . 10
5.2.1 Visual inspection . 10
5.2.2 Dimensions and masses . 10
5.2.3 Actuating components . 10
5.2.4 Strength of mounting . 11
5.2.5 Strength of connections . 11
5.3 Environmental tests . 12
5.3.1 Vibration performance . 12
5.3.2 Mechanical shocks . 12
5.3.3 Centrifugal acceleration . 13
5.4 Climatic environmental tests. 14
5.4.1 Sand and dust . 14
5.4.2 Corrosion test (salt spray) . 14
5.4.3 Humidity . 14
5.4.4 Resistance to explosion . 15
5.4.5 Fluid contamination . 15
5.5 Electrical tests . 17
5.5.1 Voltage drop. 17
5.5.2 Insulation resistance . 17
5.5.3 Dielectric strength . 18
5.5.4 Tripping points . 18
5.5.5 Short circuit performance . 19
5.6 Service life tests (endurance) . 22
5.6.1 General. 22
5.6.2 Procedure . 22
5.6.3 Service life with overload tripping . 23
6 Qualification . 23
6.1 General conditions . 23
6.2 Selection of samples . 23
7 Periodic tests to maintain qualification . 26
7.1 Circuit breakers . 26
7.2 Materials . 26
8 Acceptance . 27
8.1 Responsibility . 27
8.2 Tests . 27
8.2.1 General . 27
8.2.2 Evaluation. 27
9 Marking . 28
Bibliography . 29

European foreword
This document (EN 2350:2024) has been prepared by 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 shall be given the status of a national standard, either by publication of an identical text
or by endorsement, at the latest by April 2025, and conflicting national standards shall be withdrawn at
the latest by April 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 2350:1990.
The main changes with respect to the previous edition are as follows:
— EN 2350 (P1), 09/1990 — General editorial improvements and update of Clause 2 and Bibliography.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this document: 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 the United
Kingdom.
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 (IEV) — Part 441: Switchgear, controlgear and
fuses
ASTM D740, Standard Specification for Methyl Ethyl Ketone
ASTM D910, Standard Specification for Leaded Aviation — Gasolines
MIL-PRF-7870C, Performance specification, lubricating oil: General purpose, low temperature
MIL-PRF-23699F, Performance specification: Lubricating oil, aircraft turbine engine, synthetic base
NATO code number O-156
MIL-PRF-87937D, Performance specification: Cleaning compound, aerospace equipment
SAE AMS1424G, Deicing/anti-icing fluid, aircraft, Newtonia
...