This assembly is the motor connector for a Grundfos U15-38SPA circulating pump, which interfaces to the capacitor (2uF) and power supply (220VAC).
Between the two brown wires leading to the cap is a black plastic holder with IDC spikes to connect a 1N4007 rectifier and unknown disk of 166 ohms resistance in series across the leads. (The leads have been removed from the spikes, and the holder top is set aside.)
What is this disk all about?
Best I can figure is some sort of thermal device. Perhaps its resistance goes up (or down) after current flows for a bit.
Finally, note that the black plastic carrier is a stand-alone unit that can be snapped in place over any leaded capacitor.