2 Pole vs 3 pole DC breaker what's the difference?

[bryhan67]

Sorry for dumb question but in DC breakers what is the difference of 1,2 or 3 pole?

In AC i know there are different voltage and phases but in DC thats no the case.

example MNEPV30-600-2PP vs MNEPVRT30-600-3PP

I know one has remote trip.

I will have 3 strings of panles that are 600vdc at 10amp. Can one 3 pole breaker work? or do I need 3 individual single pole? I dont even see a single pole 600vdc breaker for sale.

Then how is it wired? if I have one string of panles. 2 pole has two slots but I have only one pos and one neg wire. Do I need a jumper to other side?

 

[Zwy]

For PV panels, you need a 2 pole breaker to break both positive and negative. That is why a 2 pole is used for each string. With 3 strings you will need 3 breakers.

 

[Shimmy]

You aren't required to have a breaker for the PV assuming you are not paralleling strings. An isolation switch like the IMO switches is fine. Generally it is most flexible l to keep each string separate for troubleshooting rather than having one switch that breaks all strings, but it is personal preference.