Earlier this year we had several other threads asking about Zebronics power supplies. A little research revealed they are low budget, low quality power supplies of questionable performance and value.
Luckily the GTS250 does not require a lot of power. here is a link to a technical review with a chart showing total power consumption for a pc system with a GTS250 video card:http://www.tomshardware.com/reviews/geforce-gts-250,2172-10.html
If available, the Corsair CX400 would be an appropriate choice. Corsair has a reputation for high quality psu's. They consistely earn high marks in technical reviews. They are stable and reliable. In the USA they come with a 5 year warranty.
The warranty period may be different in your country.