1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 489A Circuit Breakers for Use in Communications EquipmentUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT
2、 AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Circuit Breakers for Use in Communications Equipment, UL 489A First Edition, Dated October 15, 2008 Summary of Topics This revision is being issued to reect the most recent designation of ANSI/
3、UL 489A as a Reaffirmed American National Standard (ANS). The requirements are substantially in accordance with Proposal(s) on this subject dated March 1, 2013. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means,
4、electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will U
5、L be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possib
6、ility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, li
7、ability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections,
8、tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUI
9、REMENTS notice. APRIL 23, 2013 UL 489A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 23, 2013 UL 489A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM
10、UL OCTOBER 15, 2008 (Title Page Reprinted: April 23, 2013) 1 UL 489A Standard for Circuit Breakers for Use in Communications Equipment First Edition October 15, 2008 This ANSI/UL Standard for Safety consists of the First Edition including revisions through April 23, 2013. The most recent designation
11、 of ANSI/UL 489A as a Reaffirmed American National Standard (ANS) occurred on April 23, 2013. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be submitted t
12、o UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards an
13、d all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 489A-2008 (R2013)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APR
14、IL 23, 2013 CIRCUIT BREAKERS FOR USE IN COMMUNICATIONS EQUIPMENT - UL 489A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 Components 4 3 Undated References 5 CONSTRUCTION 4 General 5
15、5 Spacings .5 6 Terminals 5 7 Manual ON/OFF Operation .5 PERFORMANCE 8 General 5 9 Calibration Test .6 10 Overload Test .6 11 Temperature Test 6 12 Endurance Test 6 13 Interrupting Test .7 14 High Ambient Conditioning Test .7 RATINGS 15 General .7 MARKINGS 16 General .7 OCTOBER 15, 2008 CIRCUIT BREA
16、KERS FOR USE IN COMMUNICATIONS EQUIPMENT - UL 489A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 The requirements of this standard cover single pole or multi-pole DC rated circuit breakers intended for use as bran
17、ch circuit overcurrent and short-circuit protection in communications equipment. 1.2 All poles of multi-pole circuit breakers covered by this standard operate at the same potential. 1.3 The requirements of this standard cover devices rated 600 volts DC or less. 1.4 This standard is intended to be us
18、ed with the Standard for Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures, UL 489, as the requirements of this standard modify tests described in that standard. 1.5 Unless otherwise specied, when the term circuit breaker is used in this standard, it refers to a circu
19、it breaker intended for use with communications equipment. 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A of the Standard for Molded-Case Circuit Breakers, Molded-Case Switches and C
20、ircuit-Breaker Enclosures, UL 489, for a list of standards covering components generally used in the products covered by this standard. 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component i
21、n the product covered by this standard, or b) Is superceded by a requirement in this standard. 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.4 Specic components are incomplete in construction features or restricted in performance capabi
22、lities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. OCTOBER 15, 2008 CIRCUIT BREAKERS FOR USE IN COMMUNICATIONS EQUIPMENT - UL 489A 4UL COPYRIGHTED MATERIAL NOT AU
23、THORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Undated References 3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 4 General 4.
24、1 A circuit breaker intended for use with communications equipment shall comply with the construction requirements for circuit breakers in the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, except as described in Sections57 . 5 Spacings 5.1 S
25、pacings within a circuit breaker shall comply with the requirements in the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489. When installed, only the spacings of the end-product need be met. 5.2 Spacings at terminals between the primary circuit
26、and an auxiliary circuit shall meet the requirements of the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, unless the circuit breaker is marked in accordance with 16.5. 6 Terminals 6.1 A circuit breaker shall have a wire connector, wire-bindi
27、ng screw, a stud-type terminal, or a spring-action terminal formed to mate with end-product parts, for making electrical connections to the equipment with which it is intended to be used. 7 Manual ON/OFF Operation 7.1 A circuit breaker shall be able to be switched ON and OFF manually. An operation t
28、hat requires the use of an ordinary tool is considered to be a manual operation. PERFORMANCE 8 General 8.1 A circuit breaker intended for use with communications equipment shall comply with the performance requirements for circuit breakers in the Standard for Molded-Case Circuit Breakers, Molded-Cas
29、e Switches, and Circuit-Breaker Enclosures, UL 489, except as described in Sections81 4 . 8.2 When the terminal parts are specially formed parts intended to mate with end-product parts, tests shall be made using either parts from the end-product or parts that effectively simulate end-product parts.
30、When the metal-to-metal connection involves dissimilar metals where the coefficients of expansion may interfere with efficient operation, a heat cycling test shall be performed to demonstrate that temperatures at the connection can be expected to be stable. The heat cycling test shall be based on th
31、e test described in the Standard for Wire Connectors, UL 486A-486B. OCTOBER 15, 2008 CIRCUIT BREAKERS FOR USE IN COMMUNICATIONS EQUIPMENT - UL 489A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 9 Calibration Test 9.1 A circuit breaker sha
32、ll comply with the Calibration tests of the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489. 9.2 When a circuit breaker is intended to be used in an ambient temperature other than 25C or 40C, tests shall be performed with the representative cir
33、cuit breaker in air at the marked ambient temperature in addition to the tests at 25C. See 16.2. When the circuit breaker is intended to be used over a range of ambient temperatures, the circuit breaker shall be tested in ambient air at both the maximum and minimum ambient temperatures. See 16.3. 10
34、 Overload Test 10.1 A circuit breaker shall comply with the Overload test of the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, except that the test current shall be 150% of the current rating. The circuit shall have a time constant not less
35、than 0.003 seconds. 11 Temperature Test 11.1 A circuit breaker shall operate without tripping until constant temperatures are attained, and materials used in the construction of a circuit breaker shall not be affected adversely by the temperatures to which they are exposed during the test. See the T
36、emperature test described in the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489. 11.2 A circuit breaker that is intended to be applied in ambient temperatures other than 25C or 40C, shall be tested using the intended ambient temperature. See 1
37、6.2. When use is intended over a range of ambient temperatures, the circuit breaker shall be tested in ambient air at the maximum temperature where use is intended. See 16.3. 12 Endurance Test 12.1 A circuit breaker shall be capable of performing as intended when operated manually or by means of a m
38、achine constructed to simulate manual operation, for 1000 cycles of ON/OFF with load operations or the number of operations required by the Endurance test operations table of the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, whichever is les
39、s. 12.2 Test conditions shall be as described in the Endurance test of the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489. OCTOBER 15, 2008 CIRCUIT BREAKERS FOR USE IN COMMUNICATIONS EQUIPMENT - UL 489A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED
40、FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 13 Interrupting Test 13.1 The interrupting test shall be performed in accordance with the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, except that the prospective current m
41、ay be any value as required for the application. The test current for the test in the Y-sequence shall not exceed the short-circuit current rating of the circuit breaker. See 16.6. 14 High Ambient Conditioning Test 14.1 When tested as described in this Section, a circuit breaker shall not become ino
42、perable as a result of exposure to high ambient temperatures. 14.2 To verify that a circuit breaker is not adversely affected by exposure to high ambient temperatures, a set of representative circuit breakers, selected in accordance with the Sets of samples table of the Standard for Molded-Case Circ
43、uit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, is to be placed in a chamber where the temperature is 100 2 C for a period of 7 hours. There shall not be any distortion of materials that would expose live parts. 14.3 After being removed from the chamber and returned to ro
44、om ambient temperatures, the representative circuit breaker shall be subjected to the calibration test in accordance with 9.1. Tripping times shall not exceed the allowable times. RATINGS 15 General 15.1 The electrical ratings of a circuit breaker shall be as described in the Standard for Molded-Cas
45、e Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, except that only DC voltage ratings are permitted and the rating is not limited to a specic voltage. Slash ratings are not permitted. MARKINGS 16 General 16.1 In addition to the marking requirements in the Standard for
46、 Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, a circuit breaker shall be marked in accordance with the marking requirements in this Section. 16.2 A circuit breaker intended to be applied in an ambient temperature other than 25C or 40C shall be marked wi
47、th the intended operating ambient temperature. Location Category B. 16.3 When a circuit breaker is intended to be used over a range of ambient temperatures, it shall be marked with that range of ambient temperatures. Location Category B. 16.4 When a circuit breaker that is intended to be connected t
48、o insulated wire is rated for use in an ambient temperature greater than 40C, the circuit breaker shall be marked to indicate the temperature rating of the connected conductor insulation. Location Category C. OCTOBER 15, 2008 CIRCUIT BREAKERS FOR USE IN COMMUNICATIONS EQUIPMENT - UL 489A 7UL COPYRIG
49、HTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 16.5 A circuit breaker that has spacings less than those required for an opposite polarity condition between the primary circuit and an auxiliary circuit at the terminals shall be marked: SAME POLARITY or the equivalent to alert the user that the same polarity should exist between adjacent line/load and auxiliary terminals. Location Category C. 16.6 When the circuit breaker has been tested for an interrupting
