Time Clock mechanical 12hr – A mechanical time clock, similar to an oven timer, with an electrical switch at the end of its time. At zero hours the switch is closed. When wound clockwise the swich immediately opens and the mechanism starts ticking back to zero. Upon reaching zero hours a snap action trips the switch back to the closed position. The mechanism may be wound up or down in hours at any time during its count down period. 1 x set C/O contacts rated 24VDC 1Amp.