Reaffirmed 2024

NATIONAL FOREWORD

This Indian Standard (Part 1) (First Revision) which is identical with IEC 60898-1 : 2015 ‘Electrical accessories — Circuit-breakers for overcurrent protection for household and similar installations — Part 1: Circuit-breakers for a.c. operation’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Low-Voltage Switchgear and Controlgear Sectional Committee and approval of the Electrotechnical Division Council.

This standard was originally published in 2008 as IS/IEC 60898-1 : 2002 ‘Electrical accessories — Circuit-breakers for overcurrent protection for household and similar installations — Part 1: Circuit-breakers for a.c. operation’. The first revision of this standard has been undertaken to make pace with the latest international practices.

The significant technical changes in this revision are as follows:

a) Revision of Cl. 9.5 to include the tests for reliability of screw-type terminals for external flexible copper conductors;

b) Revision of the test of glow-wire (Cl. 9.15);

c) Addition of test of the making and breaking capacity on an individual pole (Icn1) of multipole circuit-breakers. This test is applicable when each pole of multipole is not identical to individual pole; and

d) Simplification of the figures for short circuit tests.

The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.