Difference between "Single pole with switched neutral" AND "Double Pole" ?

[runningpiglet]

Please clarify:

What event is an example where a '

Agree with Running Piglet. I'm not sure if things have changed but it used to be that an SP+N breaker will break last and make first the neutral and has no overload protection on the neutral pole. A 2-pole breaker obviously both poles feature mag and thermal overload and no particular order to the making and breaking of the poles. I only know for a fact in the old Heinemann MCB's the SP+N version had equally sized contacts on both poles but it wouldn't surprise me if modern versions had a smaller neutral contact in the interest of saving a tenth of a gram of brass.

Yeah, making the N contact smaller and slower doesn't just save brass it saves a lot of the arc blowout space too!

 

[mainline]

I don't think anyone would be jealous of the crap I have to deal with most days.

 

[poni]

Please clarify:

What event is an example where a 'double pole' device and a 'SP+N' device would act differently?

double pole MCB's are mainly used in industrial setting's for two phase supply's and single pole+ N are mainly use in domestic setting's, will do the same job, but so would a Three pole one, why would you use one? I don't think they make a 2 pole RCBO's, I am sure they only make only single pole +N ones, so not doing the same job ,i.e.. no earth leakage protection with a double pole MCB,

 

[poni]

I don't think anyone would be jealous of the crap I have to deal with most days.

nice