前言:这是低压熔断器的通用UL、CSA和ANCE标准——第3部分:CA和CB级熔断器。这是CSA C22的第二版。2第248.3-00号（取代1996年出版的第一版）、UL 248-3第二版和NMX-J-009/248/3-2000-ANCE第一版。本标准的制定符合加拿大标准委员会对加拿大国家标准的要求。CSA集团已将其作为加拿大国家标准发布。本标准已被美国国家标准协会（ANSI）批准为美国国家标准。一般说明——本部分旨在与低碳标准一起阅读- 电压熔断器第1部分:一般要求，以下简称第1部分。本部分中条款的编号与第1部分中相同编号的条款相对应。除非本部分修改，否则第1部分的要求适用。对于以下未显示的条款，请参考低压熔断器标准第1部分:一般要求，NMX-J-009/248/3-2000-ANCE•CSA C22。2号248.1•UL 248-1。范围:本部分适用于额定电流为60A或以下，交流电压为600V的CA和CB类熔断器。直流额定值是可选的。

Preface:This is the common UL, CSA, and ANCEStandard for Low-Voltage Fuses – Part 3: Class CA and CB Fuses. This is the second edition of CSA C22.2 No. 248.3-00 (superseding the first edition, published in 1996), the second edition of UL 248-3, and the first edition of NMX-J-009/248/3-2000-ANCE.This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard.General NOTE – This Part is intended to be read together with theStandard for Low-Voltage Fuses – Part 1: General Requirements, hereafter referred to as Part 1. The numbering of the Clauses in this Part correspond to like numbered Clauses in Part 1. The requirements of Part 1 apply unless modified by this Part. For Clauses not shown below, refer to theStandard for Low-Voltage Fuses – Part 1: General Requirements, NMX-J-009/248/3-2000-ANCE • CSA C22.2 No. 248.1 • UL 248-1.Scope:This Part applies to Class CA and CB fuses rated 60 A or less and 600 V ac. DC ratings are optional.