that the primary strap 11 is arranged around the d leg and the secondary winding 12 is arranged around the b leg it is noted that legs a c which extend between the primary strap and the secondary winding are exposed and result in the generation of high leakage flux levels not effectively coupling the primary strap and the secondary winding when this configuration is tested for transformation efficiency by connecting the first and second terminal connecting portions 18 19 in series with a calibrated current source and reading the secondary peak current between the secondary leads 14 at a given period of time the result is shown at 31 in fig3 the calculated percent maximum error for these test conditions is 41 percent fig2 a shows an 34 inverted 34 laminated core current transformer 20 wherein the primary strap 21 having the configuration of u shaped body 34 and a first and second terminal connecting portion 28 29 with the bight portion 27 extends through the aperture 26 of a laminated core 22 the laminated core has a plurality of transformer core laminations 25 similar to those described earlier with reference to fig1 a in the inverted arrangement shown here the secondary winding 24 having a plurality of insulated wire turns 23 and a pair of secondary leads 33 similar to that described with reference to fig1 a is now located under the u shaped body 34 of the primary strap 21 the inverted arrangement of the primary strap 21 secondary winding.