The model 4604 open board timer combines digital timing circuitry with 10 ampere output contacts to form an timer that is available in either AC or DC operating voltages. The model 4604 is
available in fixed timing periods to 2000 seconds and adjustable timing periods to 900 seconds. When operating voltage is applied to the input terminals the relay energizes. The relay will
remain energized for the preset timing period and then de-energize. To recycle the timer the operating voltage must be removed for a minimum of the recycle time and then reapplied.