I have a data sheet that gives the coil pickup voltage as "0.85…1.1 x Us] and coil dropout voltage as "0.3…0.6 x Us".
I am assuming that Us refers to the nominal or specified coil voltage, but why is it "Us"?
Thanks
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1\$\begingroup\$ U is commonly used as as symbol for voltage on German schematics ... what make is the contactor? \$\endgroup\$– user16324Commented May 29, 2015 at 20:34
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\$\begingroup\$ @BrianDrummond Here is a Siemens contactor spec. It uses exactly that nomenclature. \$\endgroup\$– Spehro 'speff' PefhanyCommented May 29, 2015 at 20:39
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\$\begingroup\$ The data sheet I have is from Rockwell (Allen-Bradley). \$\endgroup\$– frog_jrCommented May 29, 2015 at 20:58
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Subscript S in \$U_S\$ symbol stands for German word die Spule which means the coil. So \$U_S\$ is the coil voltage.
answered May 29, 2015 at 20:53