ECA 446-A-1981 Non-Sensitive Pushbutton Switches.pdf

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1、 EIA 446-A 1 3234600 OOb736 1 - -7 NON-SENSITIVE PUSHBUTTON SWITCHES ANSI/EI A RS-446 -A49 8 1 APPROVED SEPTEMBER 8, 1981 EIA STANDARD 1 RS-44.6-A (Revision of RS-446) I I (Inclusion of RS-446-1 and RS-446-2) OCTOBER 1981 Engineering Department ELECTRONIC INDUSTRIES ASSOCIATION EIA 44b-A 1 3234b00 0

2、0b737 3 m NOTICE EIA Engineering Standards and Publications are designed to serve the pubiic interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with m

3、inimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in any respect preclude any member or non-member of EIA frar manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards

4、and Publications preclude their voluntary use by those other than EIA members, whether the standard is to be used either domestically Recommended Standards and Publications are adopted by IA without regard to whether or not their adoption may involve patents on articles, materials, or processes. By

5、such action, EIA does not assume any liability tu any patent owner, nor does it assume any obligation whatever to parties adopting the Recom- mended Standard or Publication. or internationally. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department . 2001 Eye Street, N.W. Washington,

6、D.C. 20006 Copyright 1981 ELECTRPNIC INDUSTRIES ASSOCIATION All rights reserved PRICE: $9.00 . Printed in U.S.A, - EIA 446-A 81 W 3234b00 00b8938 5 I RS-446-A NON-SENSITIVE PUSHBUTTON SWITCHES TABLE OF CONTENTS Paragraph INTRODUCTION 2.0 APPLICABLE DOCUMENTS 3.0 CLASSIFICATION 4.0 DEFINITIONS 5.0 DE

7、SIGN REQUIREMENTS 6.0 PERFORMANCE REQUIREMENTS 7.0 QUALITY ASSURANCE APPENDIX A APPENDIX B APPENDIX C APPENDIX D TABLE 1: TABLE 2: TABLE 3: TABLE 4: Standard Contact Arrangements Comparison with IEC Publication 341-1 Blank Detail Specification Non-Sensi tive Pushbutton Switch EIA Part Numbering and

8、Coding System Illuminated Chromaticity Limits Luminance Values Quali f icat ion Tests Quaii t y Conformance Inspection Page 1 2 1-2 3 -6 6 -7 7-22 :I. 22-25 26 27-28 29-32 35-37 14 16 24 25 - EIA 44b-A 83, m 3234600 OOb8737 7 m RS-446-A Page 1 NON-SENSITNE PUSHBUTTON SWITCHES (From EIA Standards Pro

9、posals No. 1441, 1441-A and 1502, formulated under the cognizance of EIA Working Group P-5.9 on Non-Sensitive Pushbutton and Keyboard Switches.) RS-446-A is a revision of RS-446 and includes material previously found in RS-446-1 (Addendum No. 1 to RS-446) and RS-446-2 (Addendum No. 2 to RS-446). INT

10、RODUCTION This Standard was formulated for the purpose of: (a) (b) Promoting interchangeability of non-sensitive pushbutton switches, and Eliminating misunderstandings or confusion between manufacturers and buyers with respect to product performance values. EIA Recommended Standard RS-446-A applies

11、to pushbutton switches intended to be installed in control circuits or auxiliary circuits of electronic equipment employing similar techniques. This Standard must be used in conjunction with a detail speci- fication which defines specific values for the performance requirements. The detail specifica

12、tion takes precedence over the requirements of the Standard and may add, delete or modify the requirements of the Standard as long as the requirements outlined in Paragraph 7.0, Table 3, Test Group A are not deleted or diminished. The buyer may utilize the Detail Specification issued by EIA or, if n

13、ecessary, prepare his own detail specification which references this Standard. The EIA Detail Specifications assign a unique part number to each particular switch configuration covered by the Detail Specification. This part number is adequate to use for procurement of a standard switch. For purposes

14、 of this EIA Standard, a standard switch is considered to be a switch which is described by an EIA Detail Specification, and a non-standard switch is considered to be a switch which is not described by an EIA Detail Specification. When a description of a non-standard switch is required, the manufact

15、urer or the buyer must prepare a detail specification which fully describes the non-standard switch. If the required non-standard switch differs from the switch types described by EIA Detail Specifications, a complete detail specification must be prepared. If the required non- standard switch is sim

16、ilar to the switch types described by the EIA Detail Specification, a detail specification may be prepared by referencing the part number of the standard switch and specifying the differences required from the standard switch. 1.0 SCOPE This Standard relates to non-sensitive pushhutton switches for

17、use in electrical and electronic equipment, and having a maximum voltage rating of 500 Vac or Vdc or a current rating not exceeding 25 amperes. EIA 44b-A 1 m 3234b00 00b940 3 m t RS-446-A Page 2 2.0 APPLICABLE DOCUMENTS The following documents of the issue in effect form part of the Standard to the

18、extent specified herein. 2.1 International Electrotechnical Commission (IEC) Publication 341-1 Pushbutton Switches Part 1: General- Re- quirements and Measuring Methods. 2.2 American National Standards (ANSI) Standard C1 Standard 52.2 Method for the Calibration of Shock and National Electrical Code

19、(NFPA 70). Vibration Pickups, Standard 2310.1 Determining Resistance of Synthetic Polymeric Materials to Fungi (ASTM G21). 2.3 Government Services Administration (GSA) FED-STD-28 Screw Thread Standards for the Federal Govern- ment. 2.4 Electronic Industries Association (EIA) RS-186E Standard Test Me

20、thods for Passive Electronic Component Parts. RS-448 RS-476 Standard Test Methods for. Electromechanical Switches. Source and Date Code Marking 2.5 Underwriters Laboratories (UL) UL94 Tests for Flammability of Plastic Materials 3.0 CLASSIFICATION 3.1 EIA Detail Specification The individual switch re

21、quirements shall be as specified herein and in ac- cordance with the applicable EIA Detail Specification. In the event of conflicts between this Standard and the Detail Specification, or other complementary documents, the latter shall govern. 3.2 Part Numbering Each switch covered by this Standard,

22、as outlined in an EIA Detail Specification (see 3.1), shall be assigned a discrete part number in accordance with Appendix D. EIA 446-A 2 3234b00 0068942 5 . . * .- RS-446-A Page 3 4.0 DEFINITIONS 4.1 Non-Sensitive Pushbutton Switch A manually operated device containing an actuator and switch having

23、 non- critical force and travel Characteristics. . -. 4.2 Operating Characteristics 4.2.1 Actuator The mechanism of the switch or housing which, when moved as in- tended, will operate the contacts. 4.2.2 Alternate Action (Maintained Position) A mechanical system in which the button returns to the fr

24、ee position when the operating force is removed for any contact mode. The contact mode changes on successive actuations. The contact mode cannot be determined by the button position. 4.2.3 Alternate Action (Two-Level Maintained) A mechanical system in which the button alternately assumes (two distin

25、ct levels when the operating force is removed on successive actuations. The. contact mode changes on successive actuations. The contact mode can be visually determined by the button position. 4.2.4 Button Interface member between actuator and fingertip. an integral part of the actuator. The button m

26、ay be 4.2.5 Contact Arrangement The circuitry of the switch and/or the arrangement of the terminals and contacts on a switch station (see Appendix A). 4.2.; Cycle The actuation, or actuations, necessary to close or open a set, or sets, of contacts and return to the original mode. 4.2.7 Cycling Rate

27、The number of cycles of operation for a given time period. c I EIA 446-A 81 m 3234600 0068942 7 m RC-446- A Page 4 4.2.8 Diffuser A device to redirect OP scatter the light from a source, primarily by the . process of diffuse transmission. 4.2.9 Divider A non-translucent device located between light

28、sources to prevent light leakage between sections of a divided button or lens. 4.2.10 Duty Cycle A statement of conducting and/or non-conducting times in repetit4us operation, normally expressed as a percentage of the total cycle (e.g.; 30% on, 70% off). 4.2.11 Filter, Color A device used to project

29、 color to the display screen or an illuminated button. 4.2.12 Free Position The initial position of the actuator when no external force (other than gravity) is applied to i+; applies to momentary switches only. . , . 4.2.13 Full Overtravel Force C The straight line force required.to move the switch

30、actuator from the free position to the total travel position. A button (actuator) with an associated light source(s) which can give visual indication by illumination. The light source(s may be related to, or independent of, the button action. 4.2.14 Illuminated Button 4.2.15 Lamp A generic term for

31、a man-made light source. By extension, the term is also used to denote sources that radiate in regions of the spectrum adjacent to the visible. 4.2.16 Legend Visual information such as numbers, words, abbreviations, or symbols displayed on a button. 4.2.17 Latched Position The mechanical position of

32、 the actuator after operation to maintain the circuit transfer. - -. . EIA 446-A 81 m 3234600 0068743 7 m RS-446-A Page 5 4.2.18 Momentary A mechanical system in which the contacts transfer when the button is depressed through the operating position, and the button and contacts return to their origi

33、nal mode when the operating force is removed. 4.2.19 Operating Force The force which must be applied to the actuator to cause it to move from the free position to the operating position. 4.2.20 Operating Position The position of the actuator at which the circuit transfers. 4.2.21 Overtravel The dist

34、ance between the operating position and the total travel po- sition. 4.2.22 Pretravel The distance through which the actuator moves from the free position to the operating position. 4.2.23 Poles The number of separate circuits which can conduct current through the switch at one time. 4.2.24 Release

35、Travel The distance between the release position and the free position, on non- latching switches. 4.2.25 Reset Force The force required to release a two-level alternate action switch from its maintained position to its free position. 4.2.26 Screen Display The surface of an illuminated button which

36、displays color with or without legending. 4.2.27 Split Display Screen A display screen divided into two or more sections which can be independently illuminated. 4.2.28 Switch Resistance See paragraph 6.4.1. 4.2.29 Switch Station A setting of the actuator which results in a particular circuit conditi

37、on. 4.2.30 Total Travel The distance which is the sum of the pretravel and the overtravel. ._ 4.2.31 Total Travel Position The position of the switch actuator beyond which further travel would cause damage to the switch. t EIA Y4b-A 1 W 3234b00 OObY4 O W U 5-446-A Page 6 4.2.32 Quality Conformance I

38、nspection e An inspection carried out by or on behalf of the manufacturer on the -components he manufactures, in order to establish that their quality is being maintained in accordance with the requirements of the applicable specification. 5.0 _, DESIGN :REQUIREMENTS 5.1 5.2 5 3 5.4 Materials Materi

39、als shall be capable of meeting the specified performance requirements. Threads Threads for removable parts shall be in accordance with FED-CTD-28. unified series of threads shall be used whenever possible. Marking Switches shall be legibly marked with the information noted below.“ If the switches a

40、re too small to be so marked, the containing package shall be marked with the same information. The 5.3.1 Manufacturers Name, Trademark, or Source Code (Listed in order of preference.) 5.3.2 Identifying Number (EIA part number, manufacturers part number, or users part number. The EIA part number sha

41、ll only be used on EIA standard switches as defined in the Introduction.) 5.3.3 Terminal Identification 5.3.4 Electrical Rating(s) To be marked when specified. 5.3.5 Date Code in Accordance with EIA RS-476 The date cade shall be a four digit number consisting of the last two digits of the year follo

42、wed by another two digits for the week of the year. Example: Date code 7632 denotes switches manufactured during the 32nd reek of 1976. Detail Requirements i .Detail requirements shall be as specified in the detail specification. Switches shall be of the design, construction, and physical dimensions

43、 specified by the detail specification, including the following: - EIA 44b-A AL m p3234b00 00b8945 2 m * R S -446 -A Page 7 5.4.1 Mounting Means 5.4.2 Electrical Terminations 5.4.3 Ratings The detail specification shall specify: A. Rated Voltage B. Rated Current C. Circuit Conditions and Associated

44、Voltage and Current 5.5 Fungus Switch insulating materials shall have a rating of O to 1 when tested in ac- cordance with the Fungus Test of ANSI 2310.1. 5.6 Flammability Switch insulating material shali be certified as meeting the 94V-2 flammability . . requirement of UL94 or better. 5.7 Workmanshi

45、p 5.7.1 Workmanship shall be of the uniformity and grade practicable in a well-equipped factory. 6.0 PERFORMANCE REQUIREMENTS Unless specific atmospheric conditions are specified in the individual test method, all measurements and tests are to be performed under the following standard atmospheric co

46、nditions: Temperature: Relative Humidity: 45% to 75% Air Pressure: 86 to 106 kPa 15OC to 35OC (59OF to 95OF) (650 to 800 mm of mercury) The switch shall be allowed sufficient time to reach thermal stability before per- forming measurements under standard atmospheric conditions. All tests ,and mea- s

47、urements shall be performed on switches as received from the supplier without any cleaning or other preparation except as specified by the individual test method. When the test requires the Switch to be mounted, the switch shall be rigidly mounted directly on a metal plate by its normal mounting mea

48、ns. The mounting plate shall exceed the contour of the switch, including the terminations when they extend beyond the front panel plane profile of the switch. EIA 446-A 81 W 3234b00 006894b 4 W RS-446-A I_ Page 8 6.1 Visual Inspection 6,l.l Method of Measurement The switches shall be visually examin

49、ed for manufacturing defects which would adversly affect serviceability; The marking shall be examined for correctness and legibility. 6.1.2 Standard The switch shall.be manufactured in a careful workmanlike manner. The markings shall be correct and legible, 62 Dimensional Examination 6.2.1 Method of Measurement The specified dimensions shall be measured by appropriate means. 6.22 Standard The dimensions shall be in accordance with the detail specification. 6.3 Operating Characteristics 6.3.1 Method of Measurement The specified operating characteristics shall be