{TAIL ~ The switching apparatus} includes one or more sensing devices for detecting {HEAD ~ the condition} of the system, directly or indirectly 
{ TAIL ~ The switching apparatus } includes one or more sensing devices for detecting { HEAD ~ the condition } of the system , directly or indirectly
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH