I was using an AC suicide cord to test the primary/secondary output of a trany that I think someone dropped and it had a dent in the primary casing. Before I clipped on the alligator clips to the primary I accidentally shorted my suicide cord. What a beautiful sound (3) surge protector in series all tripped and I did not have to go outside to my breaker box. The Transformer worked no damage but this I thing is a good idea to use surge protectors with circuit breakers did not get shocked LOL. And they tripped FAST baby I was surprised.