The system includes {TAIL ~ a circuit board}, a solid state switching device, a heat sink, and {HEAD ~ a temperature sensor} 
The system includes { TAIL ~ a circuit board } , a solid state switching device , a heat sink , and { HEAD ~ a temperature sensor }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD