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What is the difference between constant current and constant impedance ratings on Variac variable transformers.

Would you like to... Print this page Email this page Post a comment Subscribe me Add to favorites User Opinions How would you rate this answer? Helpful Not helpful Help us improve. Why was this unhelpful? Thank you for rating this answer. Constant Current Rating:  This is the continuous rated amperage at any output voltage. Constant Impedance Rating:  This is the maximum continuous amperage resistive load  at 100% voltage output that the transformer is rated when the transformer is wired for 0 to Input Voltage. This rating does not apply for non-resistive loads or if the transformer is wired for voltage boost.

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