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[quote user="rrinker"]  Plenty of current detectors work fine on DC. The original Twin-T from way back when and any of the related designs up to the advent of DCC, in fact. The Chubb Optimized Detector from the C/MRI series (and you can still get them) is an improved Twin-T design that works with DC.                              --Randy   <div style="clear:both;"> </div> [/quote] I guess I could have worded that better, possibly those that use a coil to sense current flow (a kind of transformer), need AC to work.   Diode drop detectors will work with DC just fine.
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