cut-off low

例句：

1. 1. The power supply is cut off at the low voltage level.
   电力供应在低电压水平时被切断。
2. 2.The circuit was cut off at the low voltage level.
   电路在低电压水平时被切断。
3. 3. The low voltage level is critical for safe operation of the equipment.
   低电压水平对设备的安全运行至关重要。