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How much voltage can a pressurized reed switch effectively open?

Miniature reed switches less than 20 mm (0.80 inches) glass length can effectively break up to 250 Volts.  This depends on the pull-in AT (mT) used.  The higher the better.  Reed switches less than 10 mm will shrink this value to around 150 volts.  Minimizing the current flow at the time of opening will improve this value.

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