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双电源自动转换开关是对两路电源进行切换，分常用电源和备用电源，当常用电源断电后备用电源供电，常用电源来电后恢复到常用供电(这就是自投自复，常用电源优先供电的原则) 如特殊情况不需要自动切换，也可以自行设置到手动切换(一般型具有手动/自动两用，任意调节)。再者，其内部安装有一种由微处理器控制，用于电网系统中网电与网电或网电与发电机电源启动切换的装置，可使电源连续源供电，当常用电突然故障或停电时,通过双电源切换开关，自动投入到备用电源上，使设备仍能正常运行。
双电源开关的常用4P开关的额定工作电流在32A~630A之间选择。这里本人以国产的双电源自动转换开关为例，它的额定电流可高达250 A，配备010或011控制器，配备微型断路器或塑克断路器(T1。T3)。
额定极限短路分断能力,高可达85 kA，可带负载切换；内部可靠的机械及电气联锁确保用电安全，可手动、电动及自动操作；内置离合器，使手动操作更轻松自如，既省力，又可保护电动机寿命，单相检测，全面保护系统安全；零线N线接错报警及保护，防止人为误操作，常用和备用电源均可提供监控和保护。
CA1-100L/3300-10A/RQCA1-100L/4300A-10A/RQCA1-160/4300A-100A/RQCA1-160L/3300-100A/RQ
CA1-225/4300A-100A/RQCA1-225L/3300-100A/RQCA1-250L/3300-100A/RQCA1-250L/4300A-100A/RQ
CA1-400L/3300-225A/RQCA1-400L/4300A-225A/RQCA1-630L/3300-400A/RQCA1-630L/4300A-400A/RQ
CA1-63L/3300-10A/RQCA1-63L/4300A-10A/RQCA1-800L/3300-400A/RQCA1-800L/4300A-400A/RQCA1B-100PC/3BR
CA1B-250/4300ABRCA1B-32PC/3BRCA1B-32PC/4BRCA1B-400/3300BRCA1B-400/4300ABRCA1B-63PC/3BR
CA1B-63PC/4BRCA1B-63/3300BRCA1B-63/4300ABRCA1W-1600/31000A/RCA1W-1600/31250A/R
CA1W-1600/31600A/RCA1W-1600/3200A/RCA1W-1600/3400A/RCA1W-1600/3630A/RCA1W-1600/3800A/R
CA1W-1600/41000A/RCA1W-1600/41250A/RCA1W-1600/41600A/RCA1W-1600/4200A/RCA1W-1600/4400A/R
CA1W-1600/4630A/RCA1W-1600/4800A/RCA1W-2500/31000A/RCA1W-2500/31250A/RCA1W-2500/31600A/R
CA1W-2500/32000A/RCA1W-2500/32500A/RCA1W-2500/3630A/RCA1W-2500/3800A/RCA1W-2500/41000A/R
CA1W-2500/41250A/RCA1W-2500/41600A/RCA1W-2500/42000A/RCA1W-2500/42500A/RCA1W-2500/4630A/R
CA1W-2500/4800A/RCA1W-4000/31000A/RCA1W-4000/31250A/RCA1W-4000/31600A/RCA1W-4000/32000A/R
CA1W-4000/32500A/RCA1W-4000/32900A/RCA1W-4000/33200A/RCA1W-4000/33600A/RCA1W-4000/34000A/R
CA1W-4000/41000A/RCA1W-4000/41250A/RCA1W-4000/41600A/RCA1W-4000/42000A/RCA1W-4000/42500A/R
CA1W-4000/42900A/RCA1W-4000/43200A/RCA1W-4000/43600A/RCA1W-4000/44000A/RCA1W-6300/34000A/R
CA1W-6300/35000A/RCA1W-6300/36300A/RCA1W-6300/44000A/RCA1W-6300/45000A/R
CA1W-6300/46300A/RCAP1-100/JR/2CAP1-100/JR/3CAP1-100/JR/4CAP1-1000/ZP5/3CAP1-1000/ZP5/4
CAP1-125/JR/3CAP1-125/JR/4CAP1-1250/ZP5/3CAP1-1250/ZP5/4CAP1-140/JR/3CAP1-140/JR/4
CAP1-160/JR/3CAP1-160/JR/4CAP1-1600/ZP5/3CAP1-1600/ZP5/4CAP1-1600b/ZP5/3CAP1-1600b/ZP5/4
