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if it is a "powerstat" brand autotransformer type 21, this connections will be this:
for counter clockwise knob rotation:
terminal 4,5 = voltage input
terminal 1, 3 = voltage output
for clockwise knob rotation:
terminal 1,2 = voltage input
terminal 3,4 = voltage output
bill
edit: yes, an isolation transformer is good too.
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