表示弹簧复位（断开）。可指定电路为断开或接通。
Represents a spring return (break). Circuit can be specified as open or closed.
直接启动、弹簧复位、正常闭合的邻近限制开关。右击接通或保持断开。
Proximity limit switch, directly actuated, spring returned, normally closed. Right-click for closed or held open.
电子控制单元。包括由转速传感器控制的开关晶体管，用来断开或接通初级电路。
Electronic control unit. Contains a switching transistor controlled by a speed sensor and is used to open and close the primary circuit.
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