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Old 04-13-2010, 07:53 AM   #16
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With just three terminals, I'd think the contacts go between line and load terminals, and the CdS cell is in series with a ~2w resistor or resistance wire which heats a bimetallic switch. With line voltage and light applied the current through the resistor opens the bimetallic switch.

No power and/or no light closes the switch after a time lag.

The resistance from line to N depends on the resistor value and the CdS cell, and is indeterminate.

The contact integrity can be checked: at rated current no more than a 30 mV drop across the closed contacts is good, more than 100 mV is bad.
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