{TAIL ~ The device} may be used to test such switches without affecting {HEAD ~ the load} controlled by the switch 
{ TAIL ~ The device } may be used to test such switches without affecting { HEAD ~ the load } controlled by the switch
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH