oSIST prEN 2593-001:2026

• Abstract:

  The present document specifies the characteristics, installation and mounting dimensions for plug-in relay bases for use with two and four poles double throw relays in accordance with EN 2548-001.; Relay bases in accordance with this document shall be used at ambient temperatures between −70 °C and 125 °C and at altitudes up to 25 000 m.

• Status: Not Published
• Public Enquiry End Date: 09-Nov-2026
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 07-Sep-2026
• Due Date: 25-Jan-2027
• Ref Project: prEN 2593-001 - Aerospace series — Bases for 10 A electromagnetic plug-in relays, two and four poles double thrown — Part 001: Technical specification

• Revises: SIST EN 2593-001:2015 - Aerospace series - Bases for 10 A electromagnetic plug-in relays, two and four poles double thrown - Part 001: Technical specification
• Effective Date: 12-Mar-2025

oSIST prEN 2593-001:2026 is a draft European Standard published by SIST for aerospace bases for 10 A electromagnetic plug-in relays, two and four poles double thrown. It specifies the characteristics, installation and mounting dimensions for bases used with EN 2548-001 relays, for service between -70 °C and 125 °C and up to 25 000 m altitude. For engineers, quality managers and buyers, it is the document that defines the relay-base interface, the approved materials, and the qualification checks before delivery.

What does oSIST prEN 2593-001:2026 specify?

oSIST prEN 2593-001:2026 covers plug-in relay bases for two- and four-pole double throw relays. It organizes the subject from scope and references through design, description, tests, quality assurance, marking, delivery, packaging and storage.

The document is built around these clauses:

• 1 Scope
• 2 Normative references
• 3 Terms and definitions
• 4 Design
• 5 Description
• 6 Definition drawings and mass
• 7 Qualification tests
• 8 Quality assurance
• 9 Designation and marking
• 10 Delivery conditions
• 11 Packaging
• 12 Storage

Tables 1 to 5 support the test and quality-assurance clauses, so the standard is not just a drawing document - it also tells users how conformity is checked.

What are the key requirements of oSIST prEN 2593-001:2026?

Geometry, construction and materials

Clause 4 requires the relay base assembly to keep its associated components together during normal operational life, and the retaining clip must hold the crimp contacts permanently. In practice, the base has to stay mechanically secure under aircraft service conditions.

Clause 4.2 ties the dimensions to EN 2593-003, EN 2593-004 and EN 2593-005. That means the base is defined by standardized layouts, not by local design choices.

Clause 4.8 requires all metal parts to meet EN 2349-100, and the hardware nuts and lock-washers to be non-magnetic corrosion resistance steel. This matters where corrosion protection and magnetic behavior are controlled features.

Clause 5.1 specifies a non-flammable thermoplast socket body, non-flammable silicon rubber sealing rubber, and crimp contacts in accordance with EN 3155-017. The selected contacts must suit the cables used with the base.

Sealing and keying

Clause 5.2 uses silicon rubber as the interface seal between relay and base and between base and wiring. It blocks environmental influence such as fluids and adds electrical isolation between relay terminals and housing.

Clause 5.3.1 uses polarizing holes on two-pole bases to accept only the correct pins on 28 V DC and 115 V AC coil relays. This prevents installing the wrong relay on the wrong base.

Clause 5.3.2 uses different coil terminal positions, and the contact pin position, to key four-pole DC and AC coil bases so the relay can be installed in one position only.

Clause 6 says layouts for all arrangements shall be provided. For users, this is the drawing set that confirms the exact base variant and its mounting data.

Qualification and quality control

Clause 7 requires qualification tests with the mating relay, using EN 2349 test methods for visual inspection, dimensions, vibration, shock, acceleration, temperature change, corrosion, cold/low air pressure/moist heat, ozone, mould, chemicals, insulation resistance, dielectric strength, contact voltage drop, overload, switching performance, circuit breaker compatibility, mating/unmating forces and robustness of terminations. For labs and approvers, this is the proof package before a design is released.

Clause 8 makes the manufacturer responsible for materials, process control, qualification, periodic retention, final inspection and batch acceptance, with records kept for at least five years. Product acceptance tests are required before delivery, and batch acceptance applies when contractually required.

Clause 8.4 says qualification maintenance is repeated every three years after initial qualification. That keeps the approval current over time.

What terms does oSIST prEN 2593-001:2026 define?

The document applies the terms and definitions from EN 2349-100. The terms below are the ones that matter most in practice.

• AQL - acceptance quality limit, used in batch acceptance to set the sampling tolerance.
• DC - direct current, used for coil types and overload testing.
• AC - alternating current, used for coil types and overload testing.
• Crimp contact - the female relay-base electrical contact selected to suit the specified cables.
• Interface seal - the silicon rubber seal that separates the relay, the base and the wiring from environmental influence.
• Polarizing holes - the keyed holes on two-pole bases that match the relay pins and prevent wrong mating.
• Mating relay - the relay used with the base during qualification and force testing.

Who uses oSIST prEN 2593-001:2026?

This standard is used by aerospace relay and connector designers, relay-base manufacturers, qualification laboratories, quality assurance teams and buyers who need to specify or inspect relay bases. It is also relevant to production and maintenance staff who check fit, marking, packaging and storage before installation or delivery.

What changed in oSIST prEN 2593-001:2026 from the previous edition?

oSIST prEN 2593-001:2026 supersedes EN 2593-001:2014. Compared with that edition, it removes the gold-plated finish requirement for crimp contacts in 5.1, adds the requirement that layouts for all arrangements be provided in Clause 6, and adds the codes E, F, G, H, J and K in the designation in 9.1.

Which standards are used with oSIST prEN 2593-001:2026?

Standard	What it contributes
EN 2349 (all parts)	Requirements and test procedures for switching devices, used for the qualification and acceptance test methods.
EN 2349-100	Terms and definitions, and the material and metal-part requirements referred to throughout the document.
EN 2548-001	The mating relay specification for two- and four-pole double throw relays.
EN 2593-003	Base dimensions for the non-captive fixation stud, metric variant.
EN 2593-004	Base dimensions for the melded-in fixation stud, unified variant.
EN 2593-005	Base dimensions for the melded-in fixation stud, metric variant.
EN 3155-017	Female relay-base crimp contacts, type A, class P.

What does the oSIST prEN 2593-001:2026 document contain?

oSIST prEN 2593-001:2026 contains design clauses, material descriptions, interface sealing, polarizing and keying arrangements, and the standardized dimension references for the base variants. It also contains Table 1 qualification tests, Tables 2 to 4 acceptance and qualification-maintenance conditions, and Table 5 type qualification procedure with the test sequence.

The test programme combines mechanical, environmental and electrical checks, including vibration, shock, corrosion, insulation resistance, dielectric strength, overload and circuit breaker compatibility. The document also sets designation and marking rules, then delivery, packaging and storage conditions.

The bibliography traces the base family to MIL-DTL-12883/40 and MIL-DTL-12883/41.

SLOVENSKI STANDARD
01-november-2026
Aeronavtika - Vtičnice za elektromagnetne vtične dvopolne in štiripolne releje za
10 A - 001. del: Tehnične specifikacije
Aerospace series - Bases for 10 A electromagnetic plug-in relays, two and four poles
double thrown - Part 001: Technical specification
Luft- und Raumfahrt - Fassungen für steckbare, elektromagnetische Relais, 10 A, zwei-
und vierpolige Wechselschalter - Teil 001: Technische Lieferbedingungen
S�rie a�rospatiale - Socles pour relais �lectromagn�tiques 10 A, embrochables, deux et
quatre p�les inverseurs - Partie 001: Sp�cification technique
Ta slovenski standard je istoveten z: prEN 2593-001
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
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2026
ICS 49.060 Will supersede EN 2593-001:2014
English Version
Aerospace series - Bases for 10 A electromagnetic plug-in
relays, two and four poles double thrown - Part 001:
Technical specification
Se´rie ae´rospatiale - Socles pour relais Luft- und Raumfahrt - Fassungen für steckbare,
e´lectromagne´tiques 10 A, embrochables, deux et elektromagnetische Relais, 10 A, zwei- und vierpolige
quatre po^les inverseurs - Partie 001: Spe´cification Wechselschalter - Teil 001: 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 2593-001:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Design . 7
4.1 General. 7
4.2 Dimensions. 7
4.3 Crimp contacts for electrical connections . 7
4.4 Cables . 7
4.5 Mechanical characteristics . 7
4.5.1 General. 7
4.5.2 Mounting torque (hardware) . 7
4.5.3 Mass (including crimp contact and hardware) . 7
4.5.4 Insertion force. 7
4.5.5 Extraction force . 7
4.6 Sealing plug . 7
4.6.1 General. 7
4.6.2 Configurations . 7
4.6.3 Dimensions. 7
4.6.4 Quantities . 7
4.7 Insertion and extraction tools . 8
4.7.1 General. 8
4.7.2 Plastic tool . 8
4.7.3 Metal tool . 8
4.8 Metal parts. 8
5 Description . 8
5.1 Materials/features. 8
5.2 Interface seal . 8
5.3 Polarizing holes . 9
5.3.1 Two-pole bases . 9
5.3.2 Four-pole bases . 9
6 Definition drawings and mass . 9
7 Qualification tests . 9
8 Quality assurance . 11
8.1 General. 11
8.2 Qualification procedure . 11
8.2.1 General. 11
8.2.2 Test sequence . 11
8.2.3 Samples preparation . 12
8.3 Acceptance and inspection conditions . 12
8.3.1 Product acceptance tests . 12
8.3.2 Batch acceptance test . 12
8.4 Maintenance of qualification . 12
9 Designation and marking . 14
9.1 Designation . 14
9.2 Marking . 14
10 Delivery conditions . 14
11 Packaging . 14
12 Storage . 14
Bibliography . 15

European foreword
This document (prEN 2593-001:2026) 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 is currently submitted to the CEN Enquiry.
This document will supersede EN 2593-001:2014.
EN 2593-001:2014-12:
— remove the mention “The finish of the crimp contacts shall be: gold-plated — Thickness: 1,27 µm
min” in 5.1;
— add the requirement “layouts for all arrangements shall be provided” in 6;
— add the codes E, F, G, H, J and K in the designation in 9.1.
Introduction
The relay bases specified by this document are derived from MIL-DTL-12883/40 and MIL-DTL-
12883/41, latest issue.
1 Scope
The present document specifies the characteristics, installation and mounting dimensions for plug-in
relay bases for use with two and four poles double throw relays in accordance with EN 2548-001.
Relay bases in accordance with this document shall be used at ambient temperatures between −70 °C
and 125 °C and at altitudes up to 25 000 m.
2 Normative references
...