求翻译：电路的保护,散热与冷却设备, 高功率直流开关, 地铁转向架保护, 轨道交通车顶供电与保护, 和地铁变电站保护。电路的保护 – 低压通用型熔断器, 半导体保护熔断器, 高压熔断器, 各种特殊熔断器, 熔断器底座和支持件, 以及熔断器附件。高功率直流开关 – PBD型开关,NORD型开关,MBD型开关,以及其他高功率隔离开关。地铁转向架保护 – 第三轨受流器（CCD）, 接地回流装置（ERCU）。轨道交通车顶供电和保护 – 受电弓, 熔断器箱。地铁变电站保护 – F型接地开关, Berg型开关。是什么意思？

Circuit protection, thermal and cooling equipment, high power DC switching, metro bogie protection, roof, power supply and protection of rail transportation, and metro substation protection. The protection of the circuit - low voltage general-purpose fuses, semiconductor protection fuses, high volta

Circuit protection, thermal and cooling equipment, a high-powered DC switches, Mass Transit Railway (MTR) knee protection, track traffic power and protect the roof, and the underground power substation protection. Circuit protection - Low-voltage common-type fuse protection, the semiconductor fuses,

Circuit protection, thermal and cooling equipment, high power DC switch, protection of Metro bogie, rail transit car power supply and protection, and the Metro substation protection. Circui