主备电源转换装置
switching device for main and standby power sources
高频主电源
high-frequency central power
微机主电源
Tiny machine main power supply
悬浮主电源
Levitation main power supply
主电源
primary power supply
primary power
main power
main power supply
primary source
mains
main source of electrical power
power source
Electrical mains
多电源电子设备
multi power supply devices
后备电源
backup power
backup power supply
backup source
back-up source
standby power supply
standby generator
Stand-by Power
back source
SPS Standby power supplies
UPS
信号设备电源
Power supply for signalling equipment
自备电源
self-contained power source
Self-contained Power Supply
Self-supply Generator
self-providing supply