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）。rrr 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
