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。
双电源作为执行元件，配以单片机为核心的自动控制器和带机电联锁的控制机构，是一种性能完善、安全可靠、自动化程度高、使用范围广的双电源自动转换开关。 本产品适用于交流50/60Hz、690V及以下，额定电流自6A至1250A及以下的两路电源(常用电源N和备用电源或发电机电源R)的供电系统中，因一路电源发生故障(停电、欠压、过压、断相、频率偏移)而进行电源之间的自动切换，以保证供电的可靠性和安全性。广泛应用于高层建筑、小区、医院、机场、码头、消防、冶金、化工、纺织等不允许停电的重要场所，实现无人值守连续供电。
WHK-100N/2P100
WHK-100N/2P32
WHK-100N/2P40
WHK-100N/2P63
WHK-100N/2P80
WHK-100N/2P32
WHK-100N/3P100
WHK-100N/3P32
WHK-100N/3P40
WHK-100N/3P63
WHK-100N/3P80
WHK-100N/4P100
WHK-100N/4P32
WHK-100N/4P40
WHK-100N/4P63
WHK-100N/4P80
WHK-1250N/3P1000
WHK-1250N/3P1250
WHK-1250N/4P1000
WHK-1250N/4P1250
WHK-125N2/2P125
WHK-125N2/2P32
WHK-125N2/2P40
WHK-125N2/2P63
WHK-125N2/3P125
WHK-125N2/3P32
WHK-125N2/3P40
WHK-125N2/3P63
WHK-125N2/4P125
WHK-125N2/4P32
WHK-125N2/4P40
WHK-125N2/4P63
WHK-200N/2P125
WHK-200N/2P160
WHK-200N/2P200
WHK-200N/3P125
WHK-200N/3P160
WHK-200N/3P200
WHK-200N/4P125
WHK-200N/4P160
WHK-200N/4P200
WHK-400N/2P250
WHK-400N/3P250
WHK-400N/3P315
WHK-400N/3P350
WHK-400N/3P400
WHK-400N/4P250
WHK-400N/4P315
WHK-400N/4P350
WHK-400N/4P400
WHK-400T/2P160
WHK-400T/2P200
WHK-400T/2P250
WHK-400T/2P315
WHK-400T/2P400
WHK-400T/3P160
WHK-400T/3P200
WHK-400T/3P250
WHK-400T/3P315
WHK-400T/3P400
WHK-400T/4P160
WHK-400T/4P200
WHK-400T/4P250
WHK-400T/4P315
WHK-400T/4P400
WHK-500N/3P500
WHK-500N/4P500
WHK-800N/3P800
WHK-800N/4P630
WHK-800N/4P800
WHKQ8-100H/3P
WHKQ8-100H/4P
WHKQ8-100L/3P100A
WHKQ8-100L/3P25A
WHKQ8-100L/3P32A
WHKQ8-100L/3P40A
WHKQ8-100L/3P50A
WHKQ8-100L/3P63A
WHKQ8-100L/3P80A
WHKQ8-100L/4P100A
WHKQ8-100L/4P25A
WHKQ8-100L/4P32A
WHKQ8-100L/4P40A
WHKQ8-100L/4P50A
WHKQ8-100L/4P63A
WHKQ8-100L/4P80A
WHKQ8-225H/3P
WHKQ8-225H/4P
WHKQ8-630H/3P
WHKQ8-630H/4P
WHKQ8系列双电源自动转换开关（PC二工位外置控制器)
WHKQ8系列自动转换开关（PC级两工位内置控制器）
WHKQ9-1000D/3P
WHKQ9-1000D/4P
WHKQ9-1000F/3P
WHKQ9-1000F/4P
WHKQ9-1250D/3P
WHKQ9-1250D/4P
WHKQ9-1250F/3P
WHKQ9-1250F/4P
WHKQ9-1600D/3P
WHKQ9-1600D/4P
WHKQ9-1600F/3P
WHKQ9-1600F/4P
WHKQ9-630D/3P
WHKQ9-630D/4P
WHKQ9-630F/3P
WHKQ9-630F/4P
WHKQ9-800D/3P
WHKQ9-800D/4P
WHKQ9-800F/3P
WHKQ9-800F/4P
WHKQ9系列自动转换开关（PC级三工位外置控制器）
