电流转换开关

例句：

1. 1. The current transformer is used to convert high voltage into low voltage for safety reasons.
   电流转换器用于将高压转换为低压，出于安全原因。
2. 2.The switch controls the flow of electricity in this circuit.
   开关控制着这个电路中的电流流动。
3. 3. The relay operates by closing and opening contacts when a signal is received.
   继电器通过接收到信号时闭合和打开触点来工作。