A primary/secondary surge protector circuit for protecting telecommunications equipment from {HEAD ~ power and surge transients} includes a printed circuit board and {TAIL ~ a surge protector circuit} 
A primary / secondary surge protector circuit for protecting telecommunications equipment from { HEAD ~ power and surge transients } includes a printed circuit board and { TAIL ~ a surge protector circuit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL