MnZn · 11 shape groups · 35 part numbers · Catalogue p. 100–105
ER CoreE-type Cores Fig.1 6 Fig.2 8 Fig.3 3 Fig.4 1 Fig.5 2 Fig.6 1 Fig.7 1 Fig.8 1 Fig.9 1 Fig.10 4 Fig.11 7 Fig.1 Fig.1 Shape group 01 / 11 6 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg ER4.6×3.2×0.48 4.60±0.05 0.48±0.05 3.20±0.05 1.60±0.05 4.00±0.05 0.25±0.05 — — — 3.30 2.08 5.24 1.59 8.33 / ER12×9×3.2 11.95±0.20 3.20±0.10 9.00±0.20 5.20±0.10 9.45±0.15 1.90±0.15 1.25ref — — 0.8484 0.0377 19.08 22.49 429.24 / ER14.3×7.15 14.30±0.20 7.15±0.20 9.10±0.20 5.90±0.10 10.30±0.20 5.15±0.15 2.00ref — — 1.05 0.0328 33.61 32.01 1075.69 / ER14.5×6.7×2.95 14.50±0.20 2.95±0.10 6.70±0.20 4.70±0.10 11.80±0.20 1.65±0.10 1.35ref / — 1.13 0.0646 19.88 17.54 348.74 2.20 ER20×7.6×15 20.00±0.40 15.00±0.20 7.60±0.30 7.60±0.30 14.00min 12.00±0.20 2.85±0.15 — — 1.64 0.0409 65.71 40.08 2633.79 15.20 EER16×16×14 16.00±0.30 14.00±0.20 16.00±0.30 6.45±0.20 12.00±0.30 12.00±0.20 — 10.85±0.20 — 1.32 0.0312 56.12 42.40 2379.63 19.03
Fig.2 Fig.2 Shape group 02 / 11 8 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg ER7.5×4×2.5 7.50±0.15 2.50±0.15 4.00±0.15 2.60±0.10 6.20±0.20 1.75±0.10 0.65ref 5.70±0.20 — 2.37 0.4059 13.82 5.83 80.62 0.5500 ER9.5×4.9×2.45 9.45±0.20 2.45±0.15 4.90±0.10 3.40±0.15 7.65±0.15 1.70±0.15 — 7.10min — / / / / / 0.6400 ER10.83×5.9×2.45 10.83±0.20 2.45±0.10 5.90±0.15 4.15±0.15 8.85±0.20 1.58±0.10 — 8.10±0.20 — 1.31 0.1111 15.42 11.78 181.72 1.10 ER11.5 11.00±0.20 2.45±0.10 5.90±0.15 4.33±0.15 8.85±0.15 1.60±0.10 1.00ref — — 1.36 0.1178 15.71 11.55 181.41 1.10 ER26.4×21.6×6.05 26.40±0.35 6.05±0.10 21.60±0.30 12.00±0.20 22.00±0.35 3.40±0.15 — 14.60±0.30 — 0.2995 0.0025 36.38 121.46 4418.40 23.48 ER28.55×11.4×14 28.55±0.55 14.00±0.25 11.40±0.25 9.90±0.25 21.20min 9.65±0.25 3.40ref — — 0.8833 0.0121 64.53 73.06 4715.02 28.75 ER29×25×5.8 29.00±0.45 5.80±0.10 25.00±0.40 14.00±0.20 26.00±0.35 2.75±0.10 — 20.00±0.35 / 0.2507 0.0016 38.52 153.67 5919.62 29.40 ER35×11.3×21.5 35.30±0.50 21.50±0.20 11.30±0.20 11.30±0.20 26.40min 15.50±0.20 4.30ref — — 1.04 0.0117 92.55 88.97 8234.45 /
Fig.3 Fig.3 Shape group 03 / 11 3 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg ER10×6.6×2.35 10.00±0.20 2.35±0.10 6.60±0.15 4.50+0.00/-0.30 7.80±0.15 1.23±0.10 ±0.20 6.60±0.15 — 0.8795 0.0566 13.68 15.55 212.68 / ER12.2×9×4 12.20±0.20 4.00±0.10 9.00±0.15 5.55±0.10 10.00±0.20 2.53±0.10 — 8.60±0.15 — 0.8300 0.0320 21.51 25.92 557.55 2.70 ER14.3×3.6 14.30±0.20 3.60±0.05 11.00±0.15 7.10±0.15 11.50±0.20 2.00+0.10/-0.075 — 10.00±0.20 / 0.5567 0.0148 20.96 37.66 789.49 /
Fig.4 Fig.4 Shape group 04 / 11 1 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg ER10×7×2.45 10.00±0.20 2.45±0.10 7.00±0.20 3.80±0.15 8.50±0.15 1.30±0.15 — 6.73±0.20 4.50±0.15 1.02 0.0724 14.32 14.06 201.34 1.36
Fig.5 Fig.5 Shape group 05 / 11 2 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg ER12.5×12.5×2.9 12.50±0.30 2.90±0.15 12.50±0.30 5.50±0.15 10.00±0.20 1.90±0.15 — 6.00±0.20 — 0.6617 0.0248 17.67 26.71 471.94 2.93 ER35×26×6.65 35.00±0.50 6.65±0.10 26.00±0.40 15.00±0.20 29.00±0.40 2.75±0.10 — 21.00±0.35 17.00±0.20 0.2096 0.0010 42.25 201.62 8519.10 44.66
Fig.6 Fig.6 Shape group 06 / 11 1 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg ER19.38×14.94×4.27 19.38±0.30 4.27+0.00/-0.15 14.94±0.25 8.30±0.15 15.29+0.00/-0.56 2.01max — 18.11±0.20 0.51+0.10/-0.05 0.4040 0.0062 26.14 64.69 1690.91 /
Fig.7 Fig.7 Shape group 07 / 11 1 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg ER23.5×22.1×5.7 23.50±0.30 5.70±0.10 22.10±0.30 9.50±0.15 19.10±0.30 2.80±0.15 — 13.90±0.20 / 0.3099 0.0030 32.22 103.95 3349.12 20.20
Fig.8 Fig.8 Shape group 08 / 11 1 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg ER31.8×20.2×6.9A 31.80±0.50 6.85±0.10 20.15+0.10/-0.25 12.50+0.15/-0.20 27.50+0.40/-0.20 4.15±0.10 — 21.50+0.40/-0.30 / 0.3777 0.0032 44.11 116.80 5152.26 26.78
Fig.9 Fig.9 Shape group 09 / 11 1 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg EER9.8×7.5×3.95 9.80±0.15 3.95±0.10 7.50±0.15 2.50±0.10 7.80±0.15 2.55±0.13 — 6.60+0.10/-0.20 7.30±0.20 1.85 0.2558 13.43 7.25 97.33 1.73
Fig.10 Fig.10 Shape group 10 / 11 4 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg EER9.95×15×4.3 9.95±0.40 4.30±0.30 15.00±0.30 2.30±0.20 7.50min 3.20±0.15 — 13.10±0.25 — — — — — — — EER23.8×18.9×2.95 23.80±0.40 2.95+0.10/-0.20 18.90±0.30 3.70+0.20/-0.25 20.20±0.40 1.20+0.20/-0.10 — 17.80±0.30 / 0.6888 0.0302 15.73 22.84 359.38 15.70 EER34×22×5.8 34.00±0.50 5.70±0.15 22.00±0.40 8.00±0.20 27.80±0.40 2.65±0.15 — 18.50±0.25 / 0.3769 0.0042 33.55 89.02 2986.88 29.36 EER39.3×25.5×5.75 39.30±0.50 5.75+0.25/-0.10 25.50±0.40 6.00+0.20/-0.25 34.70±0.50 3.60+0.20/-0.15 — 22.90±0.30 / 0.6348 0.0127 31.69 49.91 1581.50 30.62
Fig.11 Fig.11 Shape group 11 / 11 7 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) H(mm) G(mm) H(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg EER32.6×14×5.8 32.60±0.50 5.80±0.15 14.00±0.30 7.20±0.20 27.75±0.50 3.35±0.15 — 10.00±0.25 / — — — — — — EER40.3×23.9×4.75 40.30±0.60 4.75±0.15 23.90±0.35 8.50+0.20/-0.25 35.30±0.60 2.75+0.20/-0.15 — 13.90±0.30 / 0.4892 0.0059 40.54 82.88 3360.07 34.46 EER42.2×35×5.75 42.20+0.70/-0.50 5.75±0.15 35.00+0.30/-0.40 9.00±0.25 35.50+0.70/-0.50 2.80+0.25/-0.15 — 27.00+0.30/-0.40 / 0.3212 0.0026 39.45 122.81 4844.29 32.46 EER50.2×40×5.75 50.20+0.70/-0.60 5.75±0.15 40.00+0.40/-0.45 9.00±0.25 43.50+0.70/-0.60 2.65+0.25/-0.15 — 32.00+0.30/-0.45 / 0.3096 0.0023 41.36 133.60 5526.17 41.66 EER50.3×25.9×10.6 50.30+0.70/-0.60 10.60+0.25/-0.15 25.90+0.40/-0.45 11.15±0.30 39.30+0.70/-0.60 5.50+0.25/-0.15 — 23.90+0.30/-0.40 / 0.3229 0.0020 52.06 161.22 8393.50 53.24 EER51.8×26.8×9.75 51.80+0.70/-0.60 9.75+0.25/-0.15 26.80+0.40/-0.45 11.30±0.30 42.00+0.70/-0.60 4.85+0.25/-0.15 — 23.30+0.30/-0.40 / 0.3124 0.0019 52.62 168.44 8863.24 54.22 EER57.9×31.8×10.6 57.90±0.70 10.60±0.20 31.80±0.45 10.35±0.30 50.30±0.70 7.10±0.20 — 22.80+0.30/-0.40 / 0.4582 0.0034 61.93 135.17 8371.48 58.54
This table only shows common product numbers. If the ER core you need is not listed in the above table, please do not hesitate to contact us.
Calculated from nominal dimensions per IEC 60205: C1 = ΣL/A, C2 = ΣL/A², Le = C1²/C2, Ae = C1/C2, Ve = Le×Ae; Amin = minimum cross-section; values for paired sets apply to the assembled set. ≈Wt is a reference fired-core weight — actual values vary with material and sintering, not a specification commitment; part numbers not listed have no effective-parameter data yet.
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