photocell relay

例句：

1. 1.The photocell relay is used in the circuit to detect light changes.
   光电管继电器用于电路中检测光的变化。
2. 2. The photocell relay relay is responsible for controlling the speed of the motor.
   光电管继电器负责控制电机的速度。
3. 3. The photocell relay relay is an important component of the safety system.
   光电管继电器是安全系统的重要组成部分。