No. 3 looks just like the back side of a Graupner Entstorfilter (sorry, don't have the German dot thingies in my machine!). An RF filter for motors. Staring at one I've had for eons as I type this. The specs. on mine state: Suppression Filter 18 A, Motor voltage max. 50 V. Part Number is 3361.
"If you ignore the problem long enough, it will go away. Even flooding stops eventually!"