Dual rail reverse voltage protection

[lk.dgironi]

Hello,
I'm more on the embedded dev rather than pcb design, so sorry, my question may sounds dumb.
I'm working on a board with dual rail supply (-15 0 +15 V).
On single rail supply I use a P-Mosfet reverse voltage protection circuit like the on you can find attached.
Not sure how to use this on the dual rail supply, I'm talking about the negative side. Can someone point me in the right direction?
Thanks!

[Terry Bites]

Use an N-ch in the-ve side:

[lk.dgironi]

Thank you!
Something like the attached image?

[Terry Bites]

esatto

[lk.dgironi]

Grazie 

[Terry Bites]

prego

[dietert1]

Need to exchange S and D of the n-channel mosfet. Look at the direction of the parasitic diode!

Regards, Dieter

[lk.dgironi]

Thank you!
Find attached as reference