#1 understanding the difference between VOLTAGE and Current. the analogy to water is Voltage is pressure, and Current is the volume of flow.
Your DZ2500s are not failing because of current- they are failing likely because the voltage spike generated from inductive transients during a fault. Electronic devices have a key value- peak maximum voltage- beyond which they break down. This is kind of like a water pressure rating. If a random spike in water pressure bursts a component- that resulting permanent leak then results in uncontrolled flow. EDIT- the example in the DZ2500 is that a derail or just other transient voltage spike (something like 30+V or more ) shoots down the anti-derailing sensing leads right in the microcontroller of the DZ2500 switch motor. Since that pin of the microprocessor chip has a maximum peak voltage limit- exceeding that can then minimally blow that sensing pin function and worst case- blow the entire processor chip effectively killing the DZ2500 switch motor.
#2 Circuit breakers and fuses protect against Current- not voltage. Breakers basically do nothing to protect electronics other than after the fact of damage and the electronics go dead short- then the breaker trips. The purpose of a fuse or breaker is to allow power to valid loads, and attempt to detect and stop current transients above a rated value and time duration. It's mostly to protect the thin wiring and paths (example circuit traces) to prevent a total meltdown and possible fire risk. Again, a breaker is a good idea- but not because it will save your precious electronics- it won't save them. It prevent further and even more expensive damage when the uncontrolled short created in many failures just then blows and burns up anything in the path. EDIT- again, in the case of the DZ2500 switch motor- they are not pulling excessive current even in failure mode- the wiring is not melting and burning up- hence there is no dead short that any breaker would detect.
I would argue- what do you think you are trading off here?
The GW180 is a 2 part system- a Powerhouse 180 Watt 18V 10A capable power source with a pretty fast acting circuit breaker. The GW180 controller is an FET based electronic variable voltage chopping device to allow for variable output. One thing it does not have in either part of the system is any form of TVS- Transient Voltage Suppression
The Z1000 brick has a slower thermal breaker but also is only 100 W at 18V roughly 6A VS the much higher current capable source of the powerhouse 180 with 10A+.
If the Z1000 brick is used in conjunction with the latest Z controller to make variable voltage, the latest version does have a TVS diode, but it's more about trying to protect the FETs in the controller than anything external.
Bottom line- Changing transformers doesn't change the problem- in fact makes it worse. Fast breaker or not, the GW180 is a higher current capable power source and higher threshold current before a trip, meanwhile also doing absolutely jack squat for voltage limiting or suppression.
