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雙電源自動轉(zhuǎn)換開關(guān)是對兩路電源進行切換，分常用電源和備用電源，當(dāng)常用電源斷電后備用電源供電，常用電源來電后恢復(fù)到常用供電(這就是自投自復(fù)，常用電源優(yōu)先供電的原則) 如特殊情況不需要自動切換，也可以自行設(shè)置到手動切換(一般型具有手動/自動兩用，任意調(diào)節(jié))。再者，其內(nèi)部安裝有一種由微處理器控制，用于電網(wǎng)系統(tǒng)中網(wǎng)電與網(wǎng)電或網(wǎng)電與發(fā)電機電源啟動切換的裝置，可使電源連續(xù)源供電，當(dāng)常用電突然故障或停電時,通過雙電源切換開關(guān)，自動投入到備用電源上，使設(shè)備仍能正常運行。

雙電源開關(guān)的常用4P開關(guān)的額定工作電流在32A~630A之間選擇。這里本人以國產(chǎn)的雙電源自動轉(zhuǎn)換開關(guān)為例，它的額定電流可高達250 A，配備010或011控制器，配備微型斷路器或塑克斷路器(T1。T3)。

額定極限短路分斷能力,高可達85 kA，可帶負載切換；內(nèi)部可靠的機械及電氣聯(lián)鎖確保用電安全，可手動、電動及自動操作；內(nèi)置離合器，使手動操作更輕松自如，既省力，又可保護電動機壽命，單相檢測，全面保護系統(tǒng)安全；零線N線接錯報警及保護，防止人為誤操作，常用和備用電源均可提供監(jiān)控和保護。

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