BS G 228-1981 Specification for clearance and fixing dimensions for 2 A and 3 A two- and four-pole sealed electromagnetic relays for aircraft《航空用两极和四极密封2A和3A电磁继电器的间隙和固定尺寸规范》.pdf

《BS G 228-1981 Specification for clearance and fixing dimensions for 2 A and 3 A two- and four-pole sealed electromagnetic relays for aircraft《航空用两极和四极密封2A和3A电磁继电器的间隙和固定尺寸规范》.pdf》由会员分享，可在线阅读，更多相关《BS G 228-1981 Specification for clearance and fixing dimensions for 2 A and 3 A two- and four-pole sealed electromagnetic relays for aircraft《航空用两极和四极密封2A和3A电磁继电器的间隙和固定尺寸规范》.pdf（14页珍藏版）》请在麦多课文档分享上搜索。

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

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