We are currently designing a product that connects to 230VAC mains power (single phase) (South Africa). It has a simple 12v switch mode power supply that runs the electronics. We want to put a Circuit Breaker between the mains and the PSU.
What I want to ask is, under what circumstances would one install a single pole circuit breaker vs a
1P+N circuit breaker?
The purpose of the breaker, is just to ensure that should any of our equipment short, break, get hit by lighting etc that the breaker will trip, and not affect other the main power in a negative way. I am essentially using it as a re-settable fuse.
We are considering the following two circuit breakers:
1P+N is roughly 4 times the price of the single pole.
This cost saving could drastically effect the product price, however I do not want to compromise on quality & safety of the product.
Maybe someone could also clarify the difference between a
2P (2 pole) and a (1P+N).
I generally like to install the 2 pole in my own equipment, that way when i'm working on the unit, I know that it is totally isolated from main power. But I feel this is overkill for a product in the field.