My brand new home has all available outlets protected by dual purpose circuit breakers EXCEPT for my bathrooms which are protected only by Eaton 15 amp Type BR Combination AFCI breakers. My blender and vacuum (both are pretty high draw) work faultlessly when plugged into a bathroom outlet but I'm getting tired of using an extension cord. Using any other outlet trips a breaker (about 95% of the time) immediately when turning on the appliance. Is there some kind of "dampening" device that I can plug in between the vacuum and outlet to stop the tripping? On the rare occasion when the breaker doesn't trip when turning on the appliance, it runs fine so I am guessing it has something to do with the inrush current. Note that I have a dedicated 20 amp outlet protected by a Dual Purpose breaker but that works no better than the 15 amp breakers. Also, I assume, I would be breaking code by changing out a Dual Purpose breaker with Combination Breaker. Any advise would be greatly appreciated.
I believe your dual function breakers (GFCI and AFCI protection) are thinking you have an arc fault, not a ground fault or excessive current. A "Combination Breaker" is one that provides series and parallel arc fault protection and not GFCI protection. Some people confuse "Combination" with GFCI and AFCI, but those are properly called "Dual Function", as you did.
Is the bathroom outlet AFCI protected? If not, you just ruled out over-current (inrush) and ground fault causing the trip, meaning the other breakers are thinking there is an arc fault.
Motors that have brushes are common causes of what you are experiencing. Unfortunately all this great new "protection" is interfering with day to day operation.
The appliances are broken.
They're dual-function so you'll have to have a conversation with the breaker to see if this is an AFCI or GFCI trip.
The purpose of both of them is to protect you from defective appliances that can start a fire or shock you to death.
Note that this is particularly important on kitchen and bathroom appliances because of the presence of water. Using an extension cord to defeat GFCI protection in a kitchen is a classic Darwin award scenario.
Or the wiring has issues
Given that these are the main high-draw appliances you use, it's also possible this is an AFCI trip due to a wiring problem in the walls. It would be a loose connection that can handle low current, but breaks down on high current. This is a serious firestarter if so.
However, I would expect this to occur one one or at most two circuits. for every AFCI/GFCI circuit to do this would debunk this problem and put it right back at faulty equipment.
One of the reasons I do not like arc fault breakers is they have problems with motor circuits and speed controls or electronic wave shaping. Combination arc fault breakers protect for both series and parallel faults . There are combination breakers out there but they will specify GFCI and AFCI if it just states AFCI it covers series and parallel , Dual function is AFCI, GFCI. I could be wrong but all the breakers I have installed follow that naming convention.