SIST EN 4838-001:2018

SLOVENSKI STANDARD
01-november-2018
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Aerospace series - Arc Fault Circuit breakers, single-pole, temperature compensated,
rated current 3 A to 25 A - 115 V a.c. 400 Hz Constant Frequency - Part 001: Technical
specification
Luft- und Raumfahrt - Arc Fault Schutzschalter, einpolig, Temperaturkompensiert,
Nennströme von 3 A bis 25 A - 115 V a.c. 400Hz Konstantfrequenz - Teil 001:
Technische Lieferbedingungen
Série aérospatiale - Disjoncteurs unipolaires à détection d’arc compensés en
température, intensités nominales 3 A à 25 A - 115 V a.c. 400 Hz fréquence fixe - Partie
001: Spécification technique
Ta slovenski standard je istoveten z: EN 4838-001:2018
ICS:
49.060 /HWDOVNDLQYHVROMVND Aerospace electric
HOHNWULþQDRSUHPDLQVLVWHPL equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4838-001
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2018
EUROPÄISCHE NORM
ICS 49.060
English Version
Aerospace series - Arc Fault Circuit breakers, single-pole,
temperature compensated, rated current 3 A to 25 A - 115
V a.c. 400 Hz Constant Frequency - Part 001: Technical
specification
Série aérospatiale - Disjoncteurs unipolaires à Luft- und Raumfahrt - Arc Fault Schutzschalter,
détection d'arc compensés en température, intensités einpolig, Temperaturkompensiert, Nennströme von 3
nominales 3 A à 25 A - 115 V a.c. 400 Hz fréquence fixe A bis 25 A - 115 V a.c. 400Hz Konstantfrequenz - Teil
- Partie 001: Spécification technique 001: Technische Lieferbedingungen
This European Standard was approved by CEN on 27 November 2017.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4838-001:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Description . 5
5 Design . 5
6 Characteristics . 7
7 Tests . 8
8 Qualification tests . 16
9 Quality assurance . 20
10 Marking . 20
11 Delivery conditions . 20
12 Packaging . 20
13 Storage . 20

European foreword
This document (EN 4838-001:2018) 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, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2019, and conflicting national standards shall
be withdrawn at the latest by February 2019.
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.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus,
Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
1 Scope
This European Standard specifies the single-pole temperature compensated arc fault circuit breakers with
or without signal contacts, rated from 3 A to 25 A and used in aircraft on-board circuits. In any operating
state a "trip-free" tripping is ensured. These items are designed to protect aircraft wiring system from
circuit overload and arc faults. It describes specific environmental, electrical and mechanical
characteristics and the stringency of tests to be applied according to test methods of EN 3841-100.
If the design of the arc fault circuit breakers contains software or complex hardware, as a minimum, the
software and hardware shall be developed in accordance with EUROCAE ED-12B or C / RTCA DO-178B
or C, DAL C and EUROCAE ED-80 / RTCA DO-254, DAL C, respectively.
These arc fault 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 2266-003, Aerospace series — Cables, electrical, for general purpose — Operating temperatures
between – 55 °C and 200 °C — Part 003: Ink jet printable — 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 3841-100 (all parts), Aerospace series — Circuit breakers — Test methods — Part 100: General
EN 3844-1, Aerospace series — Flammability of non metallic materials — Part 1: Small burner test,
vertical — Determination of the vertical flame propagation
EN 9133, Aerospace series — Procedure Quality Management Systems — Qualification for Aerospace Standard
Products
1)
MIL-I-81969/1-02, Installing and removal tools, connector electrical contact, Type III, Class 2, composition C
1)
MIL-I-81969/14-11, Installing and removal tools, connector electrical contact, Type III, Class 2, composition B
2)
EUROCAE ED-14E / RTCA DO-160E, Environmental conditions and test procedures for airborne equipment
EUROCAE ED-12B or C / RTCA DO-178B or C, Software Consideration in Airborne Systems and Equipment
2)
Certification
1) Published by: DoD National (US) Mil. Department of Defense http://www.defenselink.mil/
2) Published by: EUROCAE Regional (EU) EURopean Organisation for Civil Aviation Equipment http://www.eurocae.org/
2)
EUROCAE ED-80 / RTCA DO-254, Design Assurance Guidance for Electronic Hardware
AS 5692, Aerospace Standard Arc Fault Circuit Breaker (AFCB) Aircraft, Trip-Free, Single Phase 115 V a.c.-
3)
400Hz — Constant Frequency
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:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Description
These arc fault circuit breakers are operated by a "push-pull" type single pushbutton (actuator). In case of
thermal overload or arc fault, electrical contacts must open. In both cases tripping time is related according
to the type of default. In any operating state a "trip-free" tripping is ensured.
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 micro-organisms 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.
3) Published by: SAE National (US) Society of Automotive Engineers http://www.sae.org/
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 energized 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 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 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.
5.2.9 Safety and reliability
The arc fault protection must never inhibit the thermal overload protection.
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 input terminal on power supply side
See product standard.
(identified by digit 1)
1 output terminal on distribution side
(identified by digit 2)
Operational ambient temperatures limits for thermal protection From − 55 °C to 125 °C
From − 55 °C to 125 °C
Temperature compensation for thermal protection
See product standard.
Rating marking On control actuator (indelible white)
a
Arc fault protection: Operational ambient temperatures limits From – 40 °C to 85 °C
a
The MTBF of the electronics (the arc fault protection) can be reduced by an excursion of the temperature inside the ranges
[– 55 °C, – 40 °C] and [85 °C, 125 °C]. Nevertheless no nuisance tripping can occur inside these ranges.

6.2 Ratings
See product standard.
6.3 Nominal voltage of operational circuits
See product standard.
6.4 Dimensional characteristics
See product standard.
6.5 Recommended panel mounting
See product standard.
7 Tests
7.1 Mechanical tests
See Table 2.
Table 2 — Mechanical tests
Tests Requirements
Visual check EN 3841-201
Closing force (push) 3,5 N to 45 N
Operational force EN 3841-502
Opening force (pull) 5 N to 30 N
EN 3841-501
Travel
For value, see product standard.
Transverse load ≥ 110 N
Actuator
Push EN 3841-503 ≥ 110 N
Longitudinal
load
Pull ≥ 110 N
Tightening torque ≥ 5 N.m
Attachment nut EN 3841-504
Rotation torque ≥ 3 N.m
Screw tightening torque ≥ 2 N.m
Tensile force as per F1
Main contact ≥ 110 N
(see Figure 1 in product standard). EN 3841-505
connection
Mechanical
Pressure force as per F2
strengt
...