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