oSIST prEN 2996-001:2020

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 with signal contacts, polarized or not, rated from 1 A to 25 A and 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 (all categories).

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 avec contacts de signalisation, polarisés ou non, 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 (toutes catégories).

Aeronavtika - Odklopniki, tripolni, temperaturno kompenzirani, nazivni toki od 1 A do 25 A - 001. del: Tehnična specifikacija

General Information

• Status: Not Published
• Public Enquiry End Date: 25-Nov-2020
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 10-Sep-2020
• Due Date: 28-Jan-2021
• Completion Date: 25-Nov-2020
• Ref Project: prEN 2996-001 - Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification

RELATIONS

• Revised: SIST EN 2996-001:2009 - Aerospace series - Circuit breakers, three-pole, temperature compensated, rated current 1 A to 25 A - Part 001: Technical specification
• Effective Date: 03-Jun-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 2996-001:2020
01-november-2020

Aeronavtika - Odklopniki, tripolni, temperaturno kompenzirani, nazivni 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 2996-001
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 2996-001:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 2996-001:2020
---------------------- Page: 2 ----------------------
oSIST prEN 2996-001:2020
DRAFT
EUROPEAN STANDARD
prEN 2996-001
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS Will supersede EN 2996-001:2006
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 2996-001:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 2996-001:2020
prEN 2996-001:2020 (E)
Contents Page

European foreword ............................................................................................................................................ 4

1 Scope .......................................................................................................................................................... 5

2 Normative references .......................................................................................................................... 5

3 Terms and definitions ......................................................................................................................... 6

4 Description .............................................................................................................................................. 6

5 Design ........................................................................................................................................................ 6

5.1 Materials .................................................................................................................................................. 6

5.1.1 Metallic materials ................................................................................................................................. 6

5.1.2 Insulation materials ............................................................................................................................. 6

5.2 Design ........................................................................................................................................................ 6

5.2.1 Insulating box ......................................................................................................................................... 6

5.2.2 Free release mechanism ..................................................................................................................... 6

5.2.3 Attachment .............................................................................................................................................. 6

5.2.4 Electrical connection units ................................................................................................................ 7

5.2.5 Control actuator .................................................................................................................................... 7

5.2.6 Rating inviolability ............................................................................................................................... 7

5.2.7 Leakage lines .......................................................................................................................................... 7

5.2.8 Protection against non-release ........................................................................................................ 7

6 Characteristics ....................................................................................................................................... 8

6.1 General characteristics ....................................................................................................................... 8

6.2 Ratings ...................................................................................................................................................... 8

6.3 Nominal voltage of main contacts ................................................................................................... 8

6.4 Signal contact performances............................................................................................................. 8

6.5 Dimensional characteristics ............................................................................................................. 9

6.6 Recommended panel mounting dimensions ............................................................................... 9

7 Tests ......................................................................................................................................................... 10

7.1 Mechanical tests .................................................................................................................................. 10

7.2 Environmental tests ........................................................................................................................... 11

7.3 Electrical tests ...................................................................................................................................... 16

8 Qualification tests ............................................................................................................................... 18

8.1 Sampling ................................................................................................................................................. 18

8.2 Material tests ........................................................................................................................................ 21

8.3 Periodic checks for qualification maintenance ........................................................................ 21

9 Quality assurance ................................................................................................................................ 21

10 Marking ................................................................................................................................................... 21

11 Delivery conditions ............................................................................................................................ 21

12 Packaging ............................................................................................................................................... 22

13 Storage .................................................................................................................................................... 22

13.1 Definition ............................................................................................................................................... 22

13.2 Storage conditions .............................................................................................................................. 22

---------------------- Page: 4 ----------------------
oSIST prEN 2996-001:2020
prEN 2996-001:2020 (E)

13.3 Storage duration ................................................................................................................................. 22

Bibliography ....................................................................................................................................................... 23

---------------------- Page: 5 ----------------------
oSIST prEN 2996-001:2020
prEN 2996-001:2020 (E)
European foreword

This document (prEN 2996-001:2020) 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 2996-001:2006.
---------------------- Page: 6 ----------------------
oSIST prEN 2996-001:2020
prEN 2996-001:2020 (E)
1 Scope

This document specifies the three-pole temperature compensated circuit breakers with signal contacts,

polarized or not, rated from 1 A to 25 A and 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

(all categories).
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 (series), 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

MIL-I-81969/1A , Installing and removal tools, connector electrical contact, type III, class 2,

composition C

MIL-I-81969/14C , Installing and removal tools, connector electrical contact, type III, class 2,

composition B

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/.

Published by: Department of Defense (DOD), the Pentagon, Washington D.C. 20301 USA

---------------------- Page: 7 ----------------------
oSIST prEN 2996-001:2020
prEN 2996-001:2020 (E)
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.

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 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.
---------------------- Page: 8 ----------------------
oSIST prEN 2996-001:2020
prEN 2996-001:2020 (E)
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 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 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 Leakage lines

The leakage lines and the minimal space to be foreseen between the undervoltage parts and any other

part of the circuit breaker made of non-insulating material, as well as between the undervoltage parts of

opposite polarity, shall be sufficient to avoid any default or arc tracking 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.
---------------------- Page: 9 ----------------------
oSIST prEN 2996-001:2020
prEN 2996-001:2020 (E)
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
3 (three) input terminals on power supply side
See product standard.
(identified by digit A1, B1, C1)
3 (three) output terminals on distribution side
(identified by digit A2, B2, C2)
Signal contact connection, circuit closed Crimp contacts size 20
when circuit breaker is released See product standard.
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 standard.
compensation
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 main contacts
See product standard.
6.4 Signal contact performances
See Table 2.
---------------------- Page: 10 ----------------------
oSIST prEN 2996-001:2020
prEN 2996-001:2020 (E)
Table 2 — Signal contact performances
Type of load 28 V d.c. 5 V d.c. 28 V d.c.
5 V a.c.
Signal
...