EMB 145 FLT CREW DECLARED EMER FUEL ON FINAL APCH WHEN FUEL ONBOARD DROPPED BELOW RESERVE FUEL REQUIREMENTS.

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WHEN WE DEPARTED WE WERE A FEW HUNDRED POUNDS ABOVE MIN FUEL. AFTER DEPARTING WE SPENT APPROXIMATELY 6-7 MINUTES AT 9000 FT TRYING TO GET IN TOUCH WITH CENTER. AFTER GETTING IN TOUCH WITH CENTER WE EVENTUALLY GOT TO OUR FILED ALTITUDE AFTER COMPLETING MANY LEVEL OFFS AT DIFFERENT ALTITUDES. WE ALSO ENCOUNTERED A STRONG HEADWIND DURING OUR ENTIRE TRIP TO ZZZ; APPROXIMATELY 110 KTS HEADWIND THE ENTIRE WAY. THROUGHOUT OUR CRUISE WE ALSO RECEIVED MANY VECTORS FROM ATC DUE TO TRAFFIC AND FLOW CONTROL INTO ZZZ. WHILE WE WERE PROCEEDING DIRECT TO XXX; WE RECEIVED ANOTHER VECTOR OFF COURSE; WHICH WE THEN DECIDED TO CALL MINIMUM FUEL SINCE OUR CALCULATIONS SHOWED THAT WE WOULD ARRIVE AT WITH 1800 LBS. FINALLY; ON FINAL WE WERE FORCED TO EXECUTE S-TURNS IN ORDER TO PROVIDE ENOUGH SPACING WITH TRAFFIC IN FRONT OF US. ON FINAL WE FINALLY DROPPED BELOW 1800 LBS TOTAL FUEL; SO THE CAPTAIN DECIDED TO CALL A PRECAUTIONARY FUEL EMERGENCY; SINCE WE HAD 45 MINUTES OF FUEL; BUT BELOW OUR RESERVES. WHEN LANDED WE HAD AROUND 1700 LBS TOTAL FUEL APPROXIMATELY.SUPPLEMENTAL INFO FROM ACN 774662: I CALLED DISPATCH TO ADVISE THEM OF THE SITUATION; THEY ADVISED ME FUEL EMER WAS AT 1200 LBS NOT WHEN BURNING INTO YOUR RESERVE. I LANDED WITH APPROX 1700 LBS.