1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 14 March 2003 prEN 3841 -51 O Edition P 3 March 2003 Comments should be sent within six months after the date of publication to Electrical Domain AECMA-STAN ICs: 49.060 Descriptors: ENGLISH VERSION Supersedes edition P 2 Septembe
2、r 1998 Aerospace series Circuit breakers Test methods Part 51 O: Strength of signal contact terminals Srie arospatiale Disjoncteurs Mthodes dessais Partie 510 : Rsistance des lments de raccordement auxiliaires Luft- und Raumfahrt Schutzschalter Prfverfahren Teil 510: Festigkeit der Signal kontakt-An
3、schlsse This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published on green paper for the needs of the European Aerospace Industry. It has been technically approved by the experts
4、of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by us
5、ers and formal agreement of AECMA-STAN it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. I I Copyright 2003 O by AECMA-STA1 Page 2 prEN 3841-510: 2003 Foreword This standard was reviewed by the Domain Technical Coordinator of AECMA-STA
6、NS Electrical Domain. After inquiries and votes carried out in accordance with the rules of AECMA-STAN defined in AECMA- STANS General Process Manual, this standard has received approval for Publication. Page 3 prEN 3841 -51 O: 2003 1 Scope This standard specifies a method of verifying the strength
7、of signal contact terminals of circuit breakers. It shall be used together with EN 3841-100. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the
8、 publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 384
9、1-100, EN 3841-509, Aerospace series - Circuit breakers - Test methods - Part 700: General 1) Aerospace series - Circuit breakers - Test methods - Part 509: Insertion and extraction forces of signai contact terminais 1 ) 3 Method 3.1 Mounting The circuit breakers shall be mounted according to 4.2 in
10、 EN 3841-100. The contact pins specified by the technical specification shall be wired according to EN 3841-100, Table 1 and installed in an insert. The signal contact shall be loaded with the lowest current and voltage indicated in the technical specification. Cables shall be arranged in such a way
11、 that a bending load may be applied by means of a weight or a suitable spring scale. 3.2 Procedure 3.2.1 Method Each contact pin shall be submitted to 20 inserting and extracting operations each with the tool specified in the technical specification and in accordance with EN 3841-509. 3.2.2 Contact
12、retention force Afterwards each contact pin shall be submitted to an axial preload as specified in the technical specification in order to take up contact slack in its cavity. The force specified by the technical specification shall then be applied for 10 s. The rate of increase of the force shall n
13、ot exceed 5 N/s. The contact maximum axial displacement shall be measured in accordance with the technical specification while the force is applied and/or after the force is removed. 1) Published as AECMA Prestandard at the date of publication of this standard Page 4 prEN 3841-510: 2003 3.2.3 Radial
14、 load The bending load shall be applied (when possible) in the four main directions related to the housing of the circuit breaker radially to the operating direction. The force specified in the technical specification shall be maintained for 1 min in each direction. One terminal shall be tested on each sample. 3.3 Requirement Requirements in accordance with technical specification and product standard. During the test, no breaking shall occur in the electrical circuit. The applied forces shall not lead to breakage or deterioration of the contact system.
