A first-half header from skipper Dan Kirkup from a free-kick put in by right-back Martin Graham means United bring all three points back from North Wales.
Adam Bradley again had a good game in the Carlisle goal, the young keeper has impressed greatly in his youth team performances this season.
The Blues again struggled to turn their superior possession into goals however, although coaches Billy Barr and Dave Wilkes will be very pleased with a League double over Wrexham in this year's North and Midlands West Conference campaign.
United line-up :
Adam Bradley, Martin Graham, Ashley Combe, Dan Kirkup, Matthew Blake, James Earl, Gary Baker, Paul Gardiner, Shaun Vipond, Rob Bainbridge, Andy Hardman.
Used substitutes :
Terry Stewart and Richie Hoban.
Updated Youth Team Results : Click here
Updated Youth Team Table : Click here