SIST EN 2349-304:2009

• Abstract:

  This standard specifies a method for testing the operating (actuating) and releasing time of relays and contactors. It shall be used together with EN 2349-100.

• Status: Published
• Publication Date: 31-Mar-2009
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 20-Mar-2009
• Due Date: 25-May-2009
• Completion Date: 01-Apr-2009
• Ref Project: EN 2349-304:2006 - Aerospace series - Requirements and test procedures for relays and contactors - Part 304: Operate and release time

• Refers: SIST EN 20287:2000 - Paper and board - Determination of moisture content - Oven-drying method (ISO 287:1985)
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2349-411:2009 - Aerospace series - Requirements and test procedures for relays and contactors - Part 411: Temperature change
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2349-414:2009 - Aerospace series - Requirements and test procedures for relays and contactors - Part 414: Mechanical shock
• Effective Date: 28-Jan-2026
• Referred By: 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: 28-Jan-2026
• Referred By: SIST EN 2349-413:2009 - Aerospace series - Requirements and test procedures for relays and contactors - Part 413: Vibration, sinusoidal and random
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2349-415:2009 - Aerospace series - Requirements and test procedures for relays and contactors - Part 415: Acceleration
• Effective Date: 28-Jan-2026

SIST EN 2349-304:2009 is a SIST standard in the aerospace series for relays and contactors. It specifies how to test operate time and release time, and it is meant to be used together with EN 2349-100 by engineers, laboratories, and quality teams working on these components.

What does SIST EN 2349-304:2009 specify?

SIST EN 2349-304:2009 specifies a test method for the operating, or actuating, time and the releasing time of relays and contactors used in aerospace applications. In practice, it gives a common way to measure timing so that results from different test houses can be compared.

The document is organized into a short scope, normative references, and two technical clauses: one for operate time and one for release time. Figures 1 to 3 support the method by showing the test circuit and the timing points used to read the measurements.

What are the key requirements of SIST EN 2349-304:2009?

SIST EN 2349-304:2009 focuses on when a relay or contactor moves from one electrical state to another, and how that timing is measured. The key point for users is that the standard defines the measurement method, while the product standard sets the acceptable time.

Operate time

Clause 3 defines operate time as the interval from applying the rated voltage to the coil until the last normally-open contact has closed. The measurement is taken without bounce time, so the reading reflects the main switching action rather than the contact bounce that follows it.

For the test conditions, the contact load must be between 5 mA and 100 mA. The open contact voltage is limited to 6 V d.c. for relays or contactors up to and including 25 A rating, and to 28 V d.c. for units above 25 A rating. For qualification tests, five measurements must be taken and recorded.

Release time

Clause 4 defines release time as the interval from removal of the rated voltage until the last normally-open contact has opened. For change-over contacts, the timing runs until the last normally-closed contact has closed, and the document says this includes the transfer time.

The same loading conditions apply here, with the contact load between 5 mA and 100 mA and the same open-contact voltage limits. Release time is also evaluated without bounce time, and qualification tests again require five recorded measurements. In practice, this gives a repeatable way to check how quickly a device drops out after power is removed.

Test method and acceptance

Figure 1 gives the typical test circuit used to determine actuation, release, and bounce times. Figures 2 and 3 show the timing reference points for switch closure and switch opening, which helps the tester identify the exact start and end of each measurement.

The measured operate and release times are not judged by fixed values in this document. Instead, the relay or contactor must meet the time specified in the relevant product standard. That means this part of the series supplies the test method, while the product standard supplies the acceptance criterion.

What terms does SIST EN 2349-304:2009 define?

• Operate time - The time from applying the rated voltage to the coil until the last normally-open contact closes.
• Release time - The time from removing the rated voltage until the last contact reaches the specified open or closed state.
• Bounce time - The short contact movement after switching, which is excluded from the timing result in this standard.
• Device under test (DUT) - The relay or contactor being measured in the test circuit.
• Normally-open (NO) contact - A contact that is open in its normal state and closes during operation.
• Normally-closed (NC) contact - A contact that is closed in its normal state and opens during operation.
• Direct current (d.c.) - The current type used for the open-contact voltage limits in the test conditions.
• Change-over contact - A contact arrangement that switches from one contact path to another, used in the release-time definition.

Who uses SIST EN 2349-304:2009?

SIST EN 2349-304:2009 is used by aerospace relay and contactor manufacturers, test laboratories, and quality personnel who need a defined method for timing tests. It is also relevant to buyers and specifiers who need to confirm that a component has been tested to the correct aerospace method.

Because the standard is part of the aerospace series, it fits work on aerospace electric equipment and systems. In practice, users apply it during development testing, qualification testing, and production verification of relays and contactors.

What changed in SIST EN 2349-304:2009 from the previous edition?

SIST EN 2349-304:2009 is identical to EN 2349-304:2006. The standard is the Slovenian adoption of that European Standard.

Which standards are used with SIST EN 2349-304:2009?

• EN 2349-100 - Provides the general requirements for relays and contactors in the same series, and this part is intended to be used with it.
• ISO 2678 - Covers insulation resistance and high-voltage tests for electrical equipment used in aircraft, and is listed as a normative reference.

What does the SIST EN 2349-304:2009 document contain?

The document contains a typical test circuit, timing diagrams, and the procedure for reading operate and release times from an oscilloscope trace. Figure 1 shows the circuit arrangement, including the device under test, resistors, switch, and measurement inputs.

Figures 2 and 3 show how timing is taken from switch closure and switch opening at t = 0. These visuals support lab setup, qualification testing, and consistent reporting of relay and contactor timing results.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Anforderungen und Prüfverfahren für Relais und Schaltschütze - Teil 304: Ansprechzeit und RückfallzeitSérie aérospatiale - Exigences et méthodes d'essais des relais et contacteurs - Partie 304 : Temps d'enclenchement et de déclenchementAerospace series - Requirements and test procedures for relays and contactors - Part 304: Operate and release time49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 2349-304:2006SIST EN 2349-304:2009en,de01-maj-2009SIST EN 2349-304:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 2349-304October 2006ICS 49.060 English VersionAerospace series - Requirements and test procedures for relaysand contactors - Part 304: Operate and release timeSérie aérospatiale - Exigences et méthodes d'essais desrelais et contacteurs - Partie 304 : Temps d'enclenchementet de déclenchementLuft- und Raumfahrt - Anforderungen und Prüfverfahren fürRelais und Schaltschütze - Teil 304: Ansprechzeit undRückfallzeitThis European Standard was approved by CEN on 10 May 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 2349-304:2006: ESIST EN 2349-304:2009
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