EN 3774-003:1999
(Main)Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 2 A to 25 A, switching capacity 65 /n - Part 003: Metric thread terminals - Product standard
Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 2 A to 25 A, switching capacity 65 /n - Part 003: Metric thread terminals - Product standard
This standard specifies the required characteristics for three-pole, temperature compensated circuit breakers, rated currents from 2 A to 25 A, switching capacity 65 In, metric threads terminals, for use in aircraft electrical systems. Their operating temperatures are between -55°C and 125°C for rated currents equal or lower than 15 A and between -55°C and 90°C for rated currents higher than 15 A, at a maximum altitude of Z = 22000 m. It shall be used together with EN 3774-001. These circuit breakers are intended for use in aircraft with electrical supplies in accordance with EN 2282.
Luft- und Raumfahrt - Schutzschalter, dreipolig, temperaturkompensiert, Nennströme von 2 A bis 25 A, Schaltvermögen 65 /n - Teil 003: Metrisches Klemmengewinde - Produktnorm
Diese Norm legt die Anforderungen an temperaturkompensierte, dreipolige Schutzschalter mit Nennströmen von 2 A bis 25 A, Schaltvermögen 65 In, mit metrischem Klemmengewinde, für den Einsatz in elektrischen Bordnetzen fest. Ihre Betriebstemperaturen liegen zwischen -55°C und 125°C für Nennströme, die kleiner oder gleich 15 A sind und zwischen -55°C und 90°C für Nennströme, die größer als 15 A sind, bis zu einer Höhe von Z = 22000 m. Sie ist in Verbindung mit EN 3774-001 anzuwenden.
Série aérospatiale - Disjoncteurs tripolaires compensés en température, intensités nominales 2 A à 25 A, pouvoir de coupure 65 /n - Partie 003: Bornes à filetage métrique - Norme de produit
La présente norme spécifie les caractéristiques requises des disjoncteurs tripolaires compensés en température, d'intensités nominales 2 A à 25 A, pouvoir de coupure 65 In, bornes à filetage métrique, utilisés dans les circuits électriques d'aéronefs. Leurs températures de fonctionnement sont comprises entre -55°C et 125°C pour les intensités nominales égales ou inférieures à 15 A et entre -55°C et 90°C pour les intensités nominales supérieures à 15 A, à une altitude Z = 22000 m. Elle doit être utilisée conjointement avec EN 3774-001.
Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 2 A to 25 A, switching capacity 65 /n - Part 003: Metric thread terminals - Product standard
General Information
- Status
- Published
- Publication Date
- 22-Jun-1999
- Withdrawal Date
- 30-Dec-1999
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 2 - Electrical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 21-Jan-2025
- Completion Date
- 21-Jan-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 3774-003:1999 is a CEN standard that defines the product requirements for aerospace-grade three-pole circuit breakers with temperature compensation. These circuit breakers have rated currents ranging from 2 A to 25 A and a switching capacity of 65 In. Designed specifically for aircraft electrical systems, this standard ensures reliable performance under challenging environmental conditions, including extreme temperatures and high altitudes. Part 003 focuses on circuit breakers featuring metric thread terminals, promoting compatibility and ease of integration in aerospace electrical assemblies.
Key Topics
- Three-Pole Circuit Breakers: The standard covers circuit breakers with three poles, suitable for multi-phase aircraft electrical systems requiring robust protection.
- Temperature Compensation: Ensures circuit breakers operate reliably across a wide temperature range, accounting for variations from -55°C to 125°C depending on the rated current.
- Rated Currents: Specifies currents from 2 A up to 25 A, providing a versatile range for diverse aerospace electrical applications.
- Switching Capacity: A high switching capacity of 65 In ensures that the circuit breakers can safely interrupt fault currents, protecting sensitive and critical avionics.
- Metric Thread Terminals: Standardizes terminal connections using metric threads, simplifying assembly and maintenance in international aerospace environments.
- Altitude Requirements: Circuit breakers are qualified for operation at altitudes up to 22,000 meters, corresponding to typical flight ceilings.
- Temperature Ranges:
- Up to 15 A: -55°C to 125°C
- Above 15 A: -55°C to 90°C
Applications
EN 3774-003:1999 circuit breakers are essential components in aircraft electrical systems that adhere to EN 2282 power supply standards. Their temperature-compensated design and mechanical specifications make them ideal for:
- Commercial and Military Aircraft: Ensuring circuit protection in varying environmental conditions encountered during flight.
- Avionics Systems: Safeguarding sensitive electronic modules from overcurrent damage.
- Electrical Distribution Panels: Providing reliable interruption and switching for three-phase power circuits.
- High-Altitude Operations: Maintaining performance and safety in the thin atmosphere of high-altitude flight zones.
- Maintenance and Replacement: Metric thread terminals allow for standardized installation and fast interchangeability during maintenance.
Related Standards
- EN 3774-001: This part should be used in conjunction with EN 3774-003 for complete specifications on three-pole temperature compensated circuit breakers.
- EN 2282: Defines electrical supply characteristics in aircraft, which are compatible with the circuit breakers covered in EN 3774-003.
- Aerospace Electrical Equipment Standards: EN 3774-003 is part of a larger group of standards governing electrical reliability and safety in aerospace technology.
Adhering to EN 3774-003:1999 enables aerospace manufacturers and maintenance organizations to ensure high-quality, reliable circuit protection solutions tailored for the extreme demands of modern aviation electrical systems. Implementing these standards helps optimize safety, durability, and performance in critical aerospace applications.
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Frequently Asked Questions
EN 3774-003:1999 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 2 A to 25 A, switching capacity 65 /n - Part 003: Metric thread terminals - Product standard". This standard covers: This standard specifies the required characteristics for three-pole, temperature compensated circuit breakers, rated currents from 2 A to 25 A, switching capacity 65 In, metric threads terminals, for use in aircraft electrical systems. Their operating temperatures are between -55°C and 125°C for rated currents equal or lower than 15 A and between -55°C and 90°C for rated currents higher than 15 A, at a maximum altitude of Z = 22000 m. It shall be used together with EN 3774-001. These circuit breakers are intended for use in aircraft with electrical supplies in accordance with EN 2282.
This standard specifies the required characteristics for three-pole, temperature compensated circuit breakers, rated currents from 2 A to 25 A, switching capacity 65 In, metric threads terminals, for use in aircraft electrical systems. Their operating temperatures are between -55°C and 125°C for rated currents equal or lower than 15 A and between -55°C and 90°C for rated currents higher than 15 A, at a maximum altitude of Z = 22000 m. It shall be used together with EN 3774-001. These circuit breakers are intended for use in aircraft with electrical supplies in accordance with EN 2282.
EN 3774-003:1999 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3774-003:1999 has the following relationships with other standards: It is inter standard links to EN 3773-001:2024, EN ISO 9013:2002/A1:2003. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3774-003:1999 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 2 A to 25 A, switching capacity 65 /n - Part 003: Metric thread terminals - Product standardLuft- und Raumfahrt - Schutzschalter, dreipolig, temperaturkompensiert, Nennströme von 2 A bis 25 A, Schaltvermögen 65 /n - Teil 003: Metrisches Klemmengewinde - ProduktnormSérie aérospatiale - Disjoncteurs tripolaires compensés en température, intensités nominales 2 A a 25 A, pouvoir de coupure 65 /n -
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