Yes the panel , the contacts are not part of scr
The scr refers to the three electrical components rec1,2 and 5
The contacts can close but the scr panel is not working after contact closes then when you start to push the handle the potentiometer sends a voltage to card the card turns on scr 1 and 2 imagine an scr like a light switch, if you could turn it off and on super rapidly you can control the brightness and dimness of the bulb
The scr which is short for silicone controlled rectifier is basically an electronic switch
You have scr 1,2and 5 ,sorry the trainer came out in me !