CSA C22.2 No. 248.5:00

National Standard of Canada

(reaffirmed 2019)

Low-Voltage Fuses — Part 5: Class G Fuses

Legal Notice for Standards

Canadian Standards Association (operating as “CSA Group”) develops standards through a consensus standards development process approved by the Standards Council of Canada. This process brings together volunteers representing varied viewpoints and interests to achieve consensus and develop a standard. Although CSA Group administers the process and establishes rules to promote fairness in achieving consensus, it does not independently test, evaluate, or verify the content of standards.

Disclaimer and exclusion of liability

This document is provided without any representations, warranties, or conditions of any kind, express or implied, including, without limitation, implied warranties or conditions concerning this document’s fitness for a particular purpose or use, its merchantability, or its non-infringement of any third party’s intellectual property rights. CSA Group does not warrant the accuracy, completeness, or currency of any of the information published in this document. CSA Group makes no representations or warranties regarding this document’s compliance with any applicable statute, rule, or regulation.

IN NO EVENT SHALL CSA GROUP, ITS VOLUNTEERS, MEMBERS, SUBSIDIARIES, OR AFFILIATED COMPANIES, OR THEIR EMPLOYEES, DIRECTORS, OR OFFICERS, BE LIABLE FOR ANY DIRECT, INDIRECT, OR INCIDENTAL DAMAGES, INJURY, LOSS, COSTS, OR EXPENSES, HOWSOEVER CAUSED, INCLUDING BUT NOT LIMITED TO SPECIAL OR CONSEQUENTIAL DAMAGES, LOST REVENUE, BUSINESS INTERRUPTION, LOST OR DAMAGED DATA, OR ANY OTHER COMMERCIAL OR ECONOMIC LOSS, WHETHER BASED IN CONTRACT, TORT (INCLUDING NEGLIGENCE), OR ANY OTHER THEORY OF LIABILITY, ARISING OUT OF OR RESULTING FROM ACCESS TO OR POSSESSION OR USE OF THIS DOCUMENT, EVEN IF CSA GROUP HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, INJURY, LOSS, COSTS, OR EXPENSES.

In publishing and making this document available, CSA Group is not undertaking to render professional or other services for or on behalf of any person or entity or to perform any duty owed by any person or entity to another person or entity. The information in this document is directed to those who have the appropriate degree of experience to use and apply its contents, and CSA Group accepts no responsibility whatsoever arising in any way from any and all use of or reliance on the information contained in this document.

CSA Group is a private not-for-profit company that publishes voluntary standards and related documents. CSA Group has no power, nor does it undertake, to enforce compliance with the contents of the standards or other documents it publishes.

Intellectual property rights and ownership

As between CSA Group and the users of this document (whether it be in printed or electronic form), CSA Group is the owner, or the authorized licensee, of all works contained herein that are protected by copyright, all trade-marks (except as otherwise noted to the contrary), and all inventions and trade secrets that may be contained in this document, whether or not such inventions and trade secrets are protected by patents and applications for patents. Without limitation, the unauthorized use, modification, copying, or disclosure of this document may violate laws that protect CSA Group’s and/or others’ intellectual property and may give rise to a right in CSA Group and/or others to seek legal redress for such use, modification, copying, or disclosure. To the extent permitted by licence or by law, CSA Group reserves all intellectual property rights in this document.

Patent rights

Attention is drawn to the possibility that some of the elements of this standard may be the subject of patent rights. CSA Group shall not be held responsible for identifying any or all such patent rights. Users of this standard are expressly advised that determination of the validity of any such patent rights is entirely their own responsibility.

Authorized use of this document

This document is being provided by CSA Group for informational and non-commercial use only. The user of this document is authorized to do only the following:

If this document is in electronic form:

• load this document onto a computer for the sole purpose of reviewing it;

• search and browse this document; and

• print this document if it is in PDF format.

  Limited copies of this document in print or paper form may be distributed only to persons who are authorized by CSA Group to have such copies, and only if this Legal Notice appears on each such copy.

  In addition, users may not and may not permit others to

• alter this document in any way or remove this Legal Notice from the attached standard;

• sell this document without authorization from CSA Group; or

• make an electronic copy of this document.

If you do not agree with any of the terms and conditions contained in this Legal Notice, you may not load or use this document or make any copies of the contents hereof, and if you do make such copies, you are required to destroy them immediately. Use of this document constitutes your acceptance of the terms and conditions of this Legal Notice.

Update No. 3

CAN/CSA-C22.2 No. 248.5-00

August 2005

Note: General Instructions for CSA Standards are now called Updates. Please contact CSA Information Products Sales or visit www.ShopCSA.ca for information about the CSA Standards Update Service.

Title: Low-Voltage Fuses — Part 5: Class G Fuses — originally published August 2000

Revisions issued: Update No. 2 — November 2004

If you are missing any updates, please contact CSA Information Products Sales or visit www.ShopCSA.ca.

The following revisions have been formally approved and are marked by a vertical line in the margin on the attached replacement pages:

CAN/CSA-C22.2 No. 248.5-00 originally consisted of 14 pages, each dated August 2000. It now consists of the following pages:

• Update your copy by inserting these revised pages.

• Keep the pages you remove for reference.

National Association of Standardization and Certification of the Electrical Sector

NMX-J-009/248/5-2000-ANCE

First Edition

Canadian Standards Association

CAN/CSA-C22.2 No. 248.5-00

Second Edition

Underwriters Laboratories Inc.

UL 248-5

Second Edition

Low-Voltage Fuses – Part 5: Class G Fuses

August 1, 2000

(Title Page Reprinted: August 11, 2005)

ANSI/UL 248-5-2005

Commitment for Amendments

This Standard is issued jointly by the National Association of Standardization and Certification of the Electrical Sector (ANCE), CSA Internationals, and Underwriters Laboratories Incorporated (UL). Amendments to this Standard will be made only after processing according to the Standards writing procedures by ANCE, CSA, and UL.

Revisions of this Standard will be made by issuing revised or additional pages bearing their date of issue. A UL Standard is current only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements.

Copyright © 2000,

2005 ANCE

Rights reserved in favor of ANCE

ISBN 1-55324-234-3

Copyright © 2000 Canadian Standards Association

All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.

ISBN 0-7629-0555-7

Copyright © 1996,

2005

Underwriters Laboratories Inc.

AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE  CAN/CSA-C22.2 NO. 248.5-00  UL 248-5 3

CONTENTS

Preface 4

1 General 9

1.1 Scope 9

1. Classification 9

2. Characteristics 9

1. Voltage rating 9

2. Current rating 9

1. Interrupting rating 9

2. Peak let-through current and clearing I2t characteristics 10

1. Construction 10

   7.1 Dimensions 10

2. Tests 12

1. Verification of temperature rise and current-carrying capacity 12

2. Verification of overload operation 12

3. Verification of operation at rated voltage 12

4. Verification of peak let-through current and clearing I2t characteristics 13

AUGUST 1, 2000 NMX-J-009/248/5-2000-ANCE  CSA C22.2 NO. 248.5-00  UL 248-5 3

CONTENTS

Preface 4

Foreword (ANCE) 5

Foreword (CSA) 6

Foreword (UL) 8

1 General 9

1.1 Scope 9

1. Classification 9

2. Characteristics 9

1. Voltage rating 9

2. Current rating 9

1. Interrupting rating 9

2. Peak let-through current and clearing I2t characteristics 10

1. Construction 10

   7.1 Dimensions 10

2. Tests 12

1. Verification of temperature rise and current-carrying capacity 12

2. Verification of overload operation 12

3. Verification of operation at rated voltage 12

4. Verification of peak let-through current and clearing I2t characteristics 13