r 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。
rCB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。
rR：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）。r

rr 施耐德系列双电源自动转换开关型号：
rWATSGA-32/3P             WATSGB-32/3P          WATSNA-32A/3P            WATSNB-32A/3P
rWATSGA-63/3P             WATSGB-63/3P          WATSNA-40A/3P            WATSNB-40A/3P
rWATSGA-100/3P            WATSGB-100/3P         WATSNA-63A/3P            WATSNB-63A/3P
rWATSGA-125/3P            WATSGB-125/3P         WATSNA-80A/3P            WATSNB-80A/3P
rWATSGA-160/3P            WATSGB-160/3P         WATSNA-100A/3P           WATSNB-100A/3P
rWATSGA-200/3P            WATSGB-200/3P         WATSNA-160A/3P           WATSNB-160A/3P
rWATSGA-250/3P            WATSGB-250/3P         WATSNA-250A/3P           WATSNB-250A/3P
rWATSGA-320/3P            WATSGB-320/3P         WATSNA-32A/4P            WATSNB-400A/3P
rWATSGA-400/3P            WATSGB-400/3P         WATSNA-40A/4P            WATSNB-630A/3P
rWATSGA-500/3P            WATSGB-500/3P         WATSNA-63A/4P            WATSNB-1000A/3P
rWATSGA-630/3P            WATSGB-630/3P         WATSNA-80A/4P            WATSNB-1250A/3P
rWATSGA-800/3P            WATSGB-800/3P         WATSNA-100A/4P           WATSNB-1600A/3P
rWATSGA-32/4P             WATSGB-32/4P          WATSNA-160A/4P           WATSNB-32A/4P
rWATSGA-63/4P             WATSGB-63/4P          WATSNA-250A/4P           WATSNB-40A/4P
rWATSGA-100/4P            WATSGB-100/4P                                  WATSNB-63A/4P
rWATSGA-125/4P            WATSGB-125/4P                                  WATSNB-80A/4P
rWATSGA-160/4P            WATSGB-160/4P                                  WATSNB-100A/4P
rWATSGA-200/4P            WATSGB-200/4P                                  WATSNB-160A/4P
rWATSGA-250/4P            WATSGB-250/4P                                  WATSNB-250A/4P
rWATSGA-320/4P            WATSGB-320/4P                                  WATSNB-400A/4P
rWATSGA-400/4P            WATSGB-400/4P                                  WATSNB-630A/4P
rWATSGA-500/4P            WATSGB-500/4P                                  WATSNB-800A/4P
rWATSGA-630/4P            WATSGB-630/4P                                  WATSNB-1000A/4P
rWATSGA-800/4P            WATSGB-800/4P                                  WATSNB-1250A/4P
r                                                                        WATSNB-1600A/4Pr