1、BRITISH STANDARD AEROSPACE SERIES BSG228:1981 ISO2315:1980 Specification for Clearance and fixing dimensions for2A and3A, two- and four-pole sealed electromagnetic relays for aircraft ISO title: Aircraft Two- and four-pole sealed electromagnetic relays,2A and3A Clearance and fixing dimensions UDC629
2、.7.064.5:621.318.56BSG228:1981 This BritishStandard, having been prepared under the directionof the Aerospace Standards Committee, was published under the authorityofthe Executive Boardand comes into effect on 30November1981 BSI01-2000 The following BSI references relate to the work on this standard
3、: Committee reference ACE/43 Draft for comment79/74956 ISBN 0 580 12378 2 National foreword This BritishStandard has been prepared under the direction of the Aerospace Standards Committee. It is identical with ISO2315:1980 “Aircraft Two- and four-pole sealed electromagnetic relays,2A and3A Clearance
4、 and fixing dimensions” published by the International Organization for Standardization (ISO). The United Kingdom has taken an active part of the work of Technical Committee ISO/TC20/SC1, Aerospace electrical requirements, ofISO. Terminology and conventions. The text of the International Standard ha
5、s been approved as suitable for publication as a BritishStandard without deviation. Some terminology and certain conventions are not identical with those used in BritishStandards; attention is especially drawn to the following: The comma has been used as a decimal marker in relation to metric units.
6、 In BritishStandards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this Standard, they should be read as “BritishStandard”. A British Standard does not purport to include all the necessary provisions
7、 of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to8 and a back c
8、over. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBSG228:1981 BSI 01-2000 i Contents Page National foreword In
9、side front cover 1 Scope 1 2 Field of application 1 3 Dimensions 1 Figure 1 Dimensions of unit and connections 2 Figure 2 Dimensions of fixings 3 Figure 3 Dimensions of unit and connections 4 Figure 4 Dimensions of fixings 5 Figure 5 Dimensions of unit and connections 6 Figure 6 Dimensions of fixing
10、s 7 Figure 7 Drilling dimensions of the support 8ii blankBSG228:1981 BSI 01-2000 1 1 Scope This International Standard specifies the clearance and fixing dimensions of two- and four-pole change-over sealed electromagnetic relays with a rated breaking capacity equal to2A or3A. 2 Field of application
11、This International Standard applies to the relays currently used for aircraft electrical power systems. The characteristics of these relays will be defined in an International Standard to be prepared. 3 Dimensions The dimensions of2A relays shall be in accordance with Figure 1 and Figure 2. The dime
12、nsions of3A relays shall be in accordance with Figure 3 and Figure 4 for two-pole relays and with Figure 5 and Figure 6 for four-pole relays.BSG228:1981 2 BSI 01-2000 3.1 Two-pole change-over relays2A 3.1.1 Unit and connections Circuit diagram of the base connections NOTE 1All connections shall be s
13、hown. In addition, at least one coil connection shall be identified by a coloured bead or any other appropriate marking. NOTE 2If it is necessary to indicate the preferred polarity, the sign plus(+) shall be used as indicated on the diagram. Dimension mm in A B C D E F G H K 5,08 10,4max. 20,6max. 1
14、1,7max. 4,75 0,5 0,76 4,5 38min. 0,76 0.200 0.410max. 0.810max. 0.461max. 0.187 0.02 0.030 0.177 1.5min. 0.030 Figure 1 Dimensions of unit and connections +0,08 0,05 +0,5 1 +0,08 0,05 +0.003 0.002 +0.02 0.04 +0.003 0.002BSG228:1981 BSI 01-2000 3 3.1.2 Methods of fixing Dimension mm in M N N 1 P R a
15、T 33,5max. 27 0,25 27,4 0,25 10,2max. 3,2 0,2 3,2 0,25 1.320max. 1.062 0.01 1.078 0.01 0.400max. 0.125 0.008 0.125 0.01 a Round or slotted fixing holes are permissible. For units with round fixing holes, the diameters shall be equal to R at centres N (N 1being ignored). Figure 2 Dimensions of fixing
16、sBSG228:1981 4 BSI 01-2000 3.2 Two-pole change-over relays3A 3.2.1 Unit and connections Circuit diagram of the base connections NOTE 1All connections shall be shown. In addition, at least one coil connection shall be identified by a coloured bead or any other appropriate marking. NOTE 2If it is nece
17、ssary to indicate the preferred polarity, the sign plus(+) shall be used as indicated on the diagram. Dimension mm in A B C D E F G H K 5,08 10,4max. 20,6max. 32max. 4,75 0,5 0,76 4,5 38min. 0,76 0.200 0.410max. 0.810max. 1.260max. 0.187 0.02 0.030 0.177 1.5min. 0.030 Figure 3 Dimensions of unit and
18、 connections +0,08 0,05 +0,5 1 +0,08 0,05 +0.003 0.002 +0.02 0.04 +0.003 0.002BSG228:1981 BSI 01-2000 5 3.2.2 Methods of fixing Dimension mm in M N N 1 P R a T 33,5max. 27 0,25 27,4 0,25 10,2max. 3,2 0,2 3,2 0,25 1.320max. 1.062 0.01 1.078 0.01 0.400max. 0.125 0.008 0.125 0.01 a Round or slotted fix
19、ing holes are permissible. For units with round fixing holes, the diameters shall be equal to R at centres N (N 1being ignored). Figure 4 Dimensions of fixingsBSG228:1981 6 BSI 01-2000 3.3 Four-pole change-over relays3A 3.3.1 Unit and connections Circuit diagram of the base connections NOTE 1All con
20、nections shall be shown. In addition, at least one coil connection shall be identified by a coloured bead or any other appropriate marking. NOTE 2If it is necessary to indicate the preferred polarity, the sign plus(+) shall be used as indicated on the diagram. Dimension mm in A B C D E F G H K 5,08
21、20,6max. 20,6max. 32max. 4,75 0,5 0,76 4,5 38min. 0,76 0.200 0.810max. 0.810max. 1.260max. 0.187 0.02 0.030 0.177 1.5min. 0.030 Figure 5 Dimensions of unit and connections +0,08 0,05 +0,5 1 +0,08 0,05 +0.003 0.002 +0.02 0.04 +0.003 0.002BSG228:1981 BSI 01-2000 7 3.3.2 Methods of fixing Figure 6 Dime
22、nsions of fixingsBSG228:1981 8 BSI 01-2000 3.4 Support panel drilling and cut outs Dimension 2A, two-pole change-over relays 3A, two-pole change-over relays 3A, four-pole change-over relays mm in mm in mm in N Q R S V 27 0,1 12,8 3,17 0,1 22,8 1.063 0.004 0.504 0.125 0.004 0.898 27 0,1 12,8 3,17 0,1
23、 22,8 1.063 0.004 0.504 0.125 0.004 0.898 27 0,1 3,17 0,1 22,8 10,2 0,1 1.063 0.004 0.125 0.004 0.898 0.400 0.004 Figure 7 Drilling dimensions of the support+0,20+0,20+0.0080+0.0080+0,20+0,20+0.0080+0.0080+0,20+0.0080blankBSG228:1981 ISO2315:1980 BSI 389 Chiswick High Road London W4 4AL BSIBritishSt
24、andardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishSta
25、ndards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technic
26、al committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for a
27、ll BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless othe
28、rwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products
29、and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration.
30、Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored
31、 in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade
32、 designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
