I've never tripped a breaker with a K20 or the K10's . I have only used them on 240v with 30A breaker though. Same with the SP2-12000's. That's the AC I have at home, at the rehearsal space and for the outdoor GP testing. I've only hooked a K20 to 120v one time to check dsp settings. Breakers will pass significant current beyond their rating for a few seconds so it takes a ton of long term power to trip a 30A 240v line. Even the SP2-12000 dumped into 2 ohms per channel at clipping with a long sine sweep didn't do it. Perhaps a few sweeps back to back would've done it eventually.
Over here the AC available is usually 120v 15A, 20A or 30A and 240V 15,20, 30 ,40 or 50A. 240V is primarily only used for heavy duty appliances and motors.