Lew Hartswick wrote:
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...

No, no load whatever.

GWE