The cores are wound from Grain Oriented silicon steel strip, which is silted into curve by computer control slitting machine. The external shape is rectangular and the cross-section is round. The cores are annealed in high vacuum furnace under protection atmosphere. The impregnation is done in vacuum impregnating equipment. The R-core transformers have advantages of compact dimension, high efficiency, low magnetic leakage, reliable safety and easy winding etc. Many transformer designers consider it as an ideal transformer structure. Specifications: R-cores may be supplied: 1. Uncut, impregnated 2. Cut, impregnated Applications: Power transformer, current transducer, instrument transformer, inductor, choke, AF transformer, magnetic amplifier, voltage stabilizer and regulator, special transformer etc Minimum power: 5VA Maximum power: 3500VA