Epcos AG produces 6 standard sizes of large U- and I-configured large ferrite cores made from power ferrite brands N27, N87, N97. High saturation induction combined with a high value of Curie temperature and with low losses of ferrite materials permits to efficiently use U- and I-configured cores as magnetic circuits of high-capacity power, pulse and high-voltage transformers for kW power range.

Information on characteristics of Epcos’s power materials and recommendations for their selection see here.

Find U and I ferrite cores in our stock

Geometrical Dimensions of Cores

Geometrical dimensions of U- and I-configured ferrite cores produced by Epcos AG.

Standard Size	A [mm]	B [mm]	C [mm]	D [mm]	E [mm]	F [mm]	Drawing
U93/76/16	93,0±1,8	76,0±0,5	16,0±0,5	48,0±0,9	≥34,6	28,0±0,5
I93/28/16	93,0±1,8		16,0±0,5			28,0±0,5
U93/76/20	93,0±1,8	76,0±0,5	20,0±0,5	48,0±0,9	≥34,6	28,0±0,5
I93/28/20	93,0±1,8		20,0±0,5			28,0±0,5
U93/76/30	93,0±1,8	76,0±0,5	30,0±0,5	48,0±0,9	≥34,6	28,0±0,5
I93/28/30	93,0±1,8		30,0±0,5			28,0±0,5
U101/76/30	101,0±1,8	76,0±0,5	30,0±0,6	48,0±0,9	≥45,0	28,0±0,5
U126/91/20	126,0±4,0	91,0±1,0	20,0±0,6	63,0±2,0	70,0±2,0
U126/28/20	126,0±4,0		20,0±0,6			28,0±1,0
U141/78/30	141,0±5,0	78,0±0,5	30,0±1,0	33,5±1,0	≥50,0
I100/30/19	100,0±1,5		30,0±0,5			19,0±0,2

The most used combinations of U- and I-configured ferrite cores are shown in figures 1 – 3. In some cases for obtaining composite magnetic circuits of increased power, combination of U-shaped U-configured core and I-configured plated connected in column, is used.

Example of Constructing Powerful Transformers

Example of constructing powerful transformers based on combination of U-, I-configured ferrite cores.

Figure 1: Construction of powerful magnetic circuit based on combination of U- and I-configured ferrite cores.
Figure 2: Construction of powerful composite E-shaped core based on combination of U-configured ferrite cores.
Figure 3: Construction of powerful magnetic circuit based on combination of U-configured ferrite cores.

Electromagnetic and Effective Parameters

Electromagnetic and effective parameters of composite magnetic circuits based on combination of П-shaped U-configured ferrite cores and I-configured plares: UU and UI.

Designation in Design Documentation

Measurement unit — piece
N87 U93/76/30 B67345-B1-X87
B67345 — U93/76/30 standard size code
B1 — U-configured core
87 — magnetic circuit made from N87 ferrite material

Additional Information

To decrease losses on transportation and storage, it is recommended (as possible) to order U- and I-configured ferrite cores in multiples of amounts contained in factory package.

*** — amount of U- and I-configured ferrite cores in pack is the same for cores of this standard size among all ferrite brands..

UR Ferrite Cores

Standard Size	A [mm]	B [mm]	C [mm]	D [mm]	E [mm]	F [mm]	Drawing
UR114/78/38	114,0±2,0	78,0-1,0	38,0-1,0	48,0+0,6	38,0-1,0	30,0-0,8

Below are shown magnetic characteristics of set consisting of two UR cores.