closed loop to normal open transistor

hi i know this circuit circuit exists because i have used it before but i cant rember the values . i want to use the rear heated window element (closed loop ) to trigger an alarm with only n/o to ground inputs .i dont want to use a relay because of  the current  draw . i think the circuit i usedto had a tip 41c transister and adrop down resister .

thanks for your time

thanks for that . that should do the trick cheers