direct current relay

例句：

1. 1. The DCrelay is used to switch power between different circuits.
   直流继电器用于在不同电路之间切换电源。
2. 2. The DC relay is essential for safe electrical systems.
   直流继电器对于安全电气系统至关重要。
3. 3.The DC relay was designed to prevent overheating during long-term operation.
   直流继电器被设计成在长期运行过程中防止过热。