安装，更换和修复照明灯具和电气控制及配电设备，如开关，继电器和断路器面板。
Install, replace and repair lighting fixtures and electrical control and distribution equipment, such as switches, relays and circuit breaker panels.
真空断路器是电力系统中压领域的一种开关设备，它担负着控制和保护的双重任务。
The vacuum circuit breaker is a kind of switch equipment which is used in the middle-voltage field in the power system, which undertakes double tasks of controlling and protecting.
除了有一个主断路器，它作为一项长期的开关并没有任何控制。
There are no controls except a master circuit breaker, which serves as an on-off switch.
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