Insinga z'umuringa zo mu bwoko bwa FIW4 Class 180 0.14mm zifite ubwikorezi bwuzuye kandi zidafite inenge zishobora gukoreshwa mu gusoda, zishobora gukoreshwa mu gusoda hakoreshejwe icyuma gihindura amashanyarazi gifite amashanyarazi menshi (Enameled Copper Transformer)

FIW ikoresha ikoranabuhanga rigezweho nko gusiga irangi ry’ubushyuhe ku giti cyayo ndetse no gupima ubushyuhe bwinshi kuri interineti kugira ngo harebwe ko ubushyuhe bw’ibicuruzwa bwizewe kandi nta nenge bufite. Ubu buryo bukomeye bwo kurinda ubushyuhe butuma FIW yuzuza cyangwa irenga amahame y’umutekano w’inganda, bikazana amahirwe menshi ku isoko no guhangana n’inganda. Uretse ibyiza byavuzwe haruguru, FIW ifite ubushobozi bwo gusonerwa neza, ubushobozi bwo guhumeka neza, ndetse n’ubushyuhe bwinshi bushobora kugera kuri dogere 180.°C. Ibi bituma FIW idahaza gusa ibyo ikenera mu gutunganya transformateur rusange, ahubwo inakoreshwa no mu mirima ifite ibisabwa byihariye, nko mu buryo bwikora mu nganda n'ahandi.