I have a Pl380 and its run on a 20amp breaker lately it pops the break during turn on, I reset the 20amp breaker and its fine. QSC says its soft start system shouldn't pop breaker. I tried this at 5 different venues that I used this on a dedicated 20 and never a problem till just last month. I only run loads of 4 and 8ohms. Strange because the amp runs like a champ after.