DC grounding switch

例句：

1. 1. The DC grounding switch is used to ensure the safety of electrical equipment.
   直流接地开关用于确保电气设备的安全。
2. 2. The technicians carefully checked the DC grounding switch before starting the work.
   技术人员在开始工作前仔细检查了直流接地开关。
3. 3. The DC grounding switch was designed to prevent electromagnetic interference during the power supply process.
   直流接地开关被设计用来在供电过程中防止电磁干扰。