前言:这是用于光伏（PV）系统的统一CSA集团和UL标准成型外壳断路器、塑壳开关和断路器外壳。这是CSA C22的第一版。2第305号和UL 489B第一版。范围:1.1这些要求包括额定值高达1500 V dc的塑壳断路器、塑壳开关和断路器外壳，用于光伏（PV）系统和附录B第1号参考文件。1.2这些要求旨在与附录B第2号参考文件的要求结合使用，除非本标准进行了修改或补充。1.3这些要求不包括模压成型- 用于电池电路的外壳断路器或塑壳开关。

Preface:This is the harmonized CSA Group and UL standard forMolded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures for Use with Photovoltaic (PV) Systems. It is the First edition of CSA C22.2 No. 305 and the First edition of UL 489B.Scope:1.1These requirements cover molded-case circuit breakers, molded-case switches, and circuit-breaker enclosures rated up to 1500 V dc, intended for use with photovoltaic (PV) systems and Ref. No. 1 of Annex B.1.2These requirements are intended to be used in conjunction with the requirements in Ref. No. 2 of Annex B, except as modified or supplemented by this Standard.1.3These requirements do not cover molded-case circuit breakers or molded-case switches intended for use in battery circuits.