WTS-D400 4A F WTS-D500 3A T WTS-A320 4A F WTS-D320 3A F WTS-B320 3A T WTS-B800 3P WTS-A630 4P WTS-A800 3P WTS-B1000 3 WTS-A1250 4 WTS-D1600 4 WTS-B2000 3 WTS-B2500 4F WTS-D3150 3F WTS-D4000 4T WTS-D5000 3I 三.工作原理 当常用电源正常,功能键置于自动档时,备用断路器...