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Lew Hartswick Lew Hartswick is offline
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Default variac question?

Grant Erwin wrote:

I have a 20 amp variac. Yesterday I tried plugging it into a 20A circuit
with its output voltage set to 30% of input voltage, and it
(consistently) popped
the breaker. When I set it to 100% of output voltage, however, it didn't
pop
the breaker. Obviously the magnetizing current is higher with the variac
turned
down. The question is why? What's going on here?

I believe the variac and my electrical circuits are both in good working
condition, in other words I don't believe this is faulty behavior.

Grant Erwin
Kirkland, Washington

Was there any load on the output?
...lew...