The Pausenuhr is an 18 day electrically driven on-off clock developed to arm and dis-arm a mine once every 24 hours. Settings are made in multiples of three hours for a 24-hour cycle; example: 3 hours on, 21 hours off, 6 hours on, 18 hours off, etc.

The Pausenuhr was designed for use with the UES in the EM, LM, RM, SM, TM, and MT mine series.

Operation. When the UES has concluded its run, a potential is applied across the ter-minals shown in figure 290, upper portion, allowing current to flow through the solder plug, Figure 290, upper portion, which melts, releasing the starting lever. After the clock has run for two hours, the star switch is moved by a pin on the bottom of the setting dial bearing. The step-up of the star switch arms the mine for the preset period. The switch screw turns the star switch, opening switch A, figure 291, and disarming the mine for the remainder of the 24 hours. This process is repeated for 18 days, at the end of which time the grooved switch roller, driven by clockwork accepts a leaf spring to close switch B, figure 291, thereby permanently arming the mine.

Setting. The switching screw is removed and the setting dial is turned 369 degrees counterclockwise to the zero position. One of seven possible delays is selected, and the screw is replaced.

Figure 290– Pausenuhr, Three Views

Figure 291 – Pausenuhr Wiring Diagram