South Africa received the toss and opted to bat at Seddon Park at the moment, with openers Sune Luus and Tazmin Brits placing on 62 runs for the primary wicket.
Kerr lastly broke the partnership within the sixth over, getting Luus LBW for her one hundredth T20 worldwide wicket.
She then obtained Brits for 53, caught by Jess Kerr.
Jess Kerr took two wickets because the guests reached 177-5 off their 20 overs.
The White Ferns scored shortly to open their chase, but in addition misplaced wickets repeatedly.
New Zealand have been 72-4 within the eighth over and, regardless of the some decrease order combat from Izzy Sharp and Jess Kerr, the Kiwis fell quick.
South Africa has levelled the five-match collection at 1-1.
The third sport is in Auckland on Friday.
