The cores are wound from Grain Oriented silicon steel strip and are annealed in high vacuum furnace under protection atmosphere. Special tools warrantees a smooth external quality and accurate window dimensions. Comparing to Step-R-cores, rectangular core is easy in assembly and it has the same characteristics of toroidal cores of making full use of grain orientation of silicon steels. Specifications: Rectangular cores may be supplied:- 1. Uncut, impregnated 2. cut, impregnated Applications: Power distribution transformer, current transducer, instrument transformer, inductor, special transformer etc Minimum window dimensions: 5 x 5 mm Minimum strip width: 5mm Maximum strip width: 300mm