A型控制器：置于转换开关内部，监测两路电源电压，控制电源转换动作。
CB级：是指转换开关主体如符合GB14048.2、GB14048.9，这些产品本身具有短路、过载保护功能，因此双电源也具有这些功能；而主体开关符合GB14048.3，本身产品不具有类似保护功能，属于PC级；主体开关符合GB14048.4的则属于CC级。
R：自投自负（意思是当常用电源出现异常后，双电源会转换至备用电源，而当常用电源恢复后，则转换至常用电源，反之则属于自投不自复）。

施耐德系列双电源自动转换开关型号： WATSGA-32/             WATSGB-32/          WATSNA-32A/            WATSNB-32A/ WATSGA-63/             WATSGB-63/          WATSNA-40A/            WATSNB-40A/ WATSGA-100/            WATSGB-100/         WATSNA-63A/            WATSNB-63A/ WATSGA-125/            WATSGB-125/         WATSNA-80A/            WATSNB-80A/ WATSGA-160/            WATSGB-160/         WATSNA-100A/           WATSNB-100A/ WATSGA-200/            WATSGB-200/         WATSNA-160A/           WATSNB-160A/ WATSGA-250/            WATSGB-250/         WATSNA-250A/           WATSNB-250A/ WATSGA-320/            WATSGB-320/         WATSNA-32A/4P            WATSNB-400A/ WATSGA-400/            WATSGB-400/         WATSNA-40A/4P            WATSNB-630A/ WATSGA-500/            WATSGB-500/         WATSNA-63A/4P            WATSNB-1000A/ WATSGA-630/            WATSGB-630/         WATSNA-80A/4P            WATSNB-1250A/ WATSGA-800/            WATSGB-800/         WATSNA-100A/4P           WATSNB-1600A/ WATSGA-32/4P             WATSGB-32/4P          WATSNA-160A/4P           WATSNB-32A/4P WATSGA-63/4P             WATSGB-63/4P          WATSNA-250A/4P           WATSNB-40A/4P WATSGA-100/4P            WATSGB-100/4P                                  WATSNB-63A/4P WATSGA-125/4P            WATSGB-125/4P                                  WATSNB-80A/4P WATSGA-160/4P            WATSGB-160/4P                                  WATSNB-100A/4P WATSGA-200/4P            WATSGB-200/4P                                  WATSNB-160A/4P WATSGA-250/4P            WATSGB-250/4P                                  WATSNB-250A/4P WATSGA-320/4P            WATSGB-320/4P                                  WATSNB-400A/4P WATSGA-400/4P            WATSGB-400/4P                                  WATSNB-630A/4P WATSGA-500/4P            WATSGB-500/4P                                  WATSNB-800A/4P WATSGA-630/4P            WATSGB-630/4P                                  WATSNB-1000A/4P WATSGA-800/4P            WATSGB-800/4P                                  WATSNB-12