ABB DPT-CB010系列双电源自动转换开关；DPT63-CB010 C40 3P
双电源自动切换开关在切换备用电源时是有延时的，这个延时主要作用在由主电源向备用电源转换上。而有些用电设备对双电源自动切换开关的转换时间是有严格要求的，因此双电源自动切换开关选型时一定要看好用电设备的转换时间。下面就介绍一些用电设备对双电源自动切换开关的转换时间的要求。
The dual power automatic switch is delayed when switching standby power supply. This delay mainly affects the conversion from main power to standby power supply. There are strict requirements for the conversion time of some electric equipment to the automatic switching switch of dual power supply. Therefore, the conversion time of the electric equipment must be optimistic when the automatic switching switch of the dual power supply is selected. Here are some requirements for conversion time of power supply equipment to double power automatic switch.
双电源自动切换开关具有自投自复功能时，当主电源恢复正常供电后，双电源自动切换开关应经延时后，切换回主电源。
When the dual power automatic switching switch has self switching function, when the main power supply is restored to normal power supply, the dual power automatic switch switch should be switched back to the main power supply after the delay of the switch.
双电源自动切换开关一般不允许带大电动机或高感抗负载转换，这类负载在运行中切换，两路电源相位差较大时，电机将受到巨大的机械应力。同时，由电动机产生的反电势引起的过流会造成熔断器熔断或断路器脱扣。因此，当双电源自动切换开关带大电动机或高感抗负载转换时，两组动触头在转换前应增加一个延时时间，即应选用延时转换型双电源自动切换开关，延时时间视负载情况确定。
The dual power automatic switch switch usually does not allow a large motor or high inductance load conversion. This type of load is switched in operation. When the phase difference between the two power supplies is large, the motor will be subjected to huge mechanical stress. At the same time, the overcurrent caused by the back EMF caused by the motor will lead to fuse fuses or circuit breaker tripping. Therefore, when the dual power automatic switch switch with large motor or high inductance load conversion, the two groups of dynamic contacts should increase a delay time before conversion, that is, the time delay conversion type dual power automatic switching switch should be selected, and the time delay time depends on the load condition.