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GOSS C-Cores

Precision GOSS Silicon Steel C-Cores (CD Series) for 50/60 Hz Single and Double-Loop Transformers

01 · Overview

GOSS C-Cores (Silicon Steel CD Series)

The Bridgeport Magnetics CD Series of GOSS C-Cores is ideal for single-loop as well as double-loop single-phase transformers. Made from cold-rolled grain-oriented silicon steel (3% silicon iron, M4-011 grade), these cores deliver a high degree of grain orientation for superior magnetic performance and numerous advantages over traditional stacked laminated cores.

32 standard sizes are available in stock, ranging from 5 VA to 5,000 VA (60 Hz, single loop), with full custom options. Rectangular phenolic tubes are available for all sizes, and zinc alloy cast clamping frames are offered for many sizes – all manufactured in the USA for reliable high-efficiency power applications.

02 · Superior Efficiency and Performance

Why Choose GOSS C-Cores for 50/60 Hz Applications

Cold-rolled grain-oriented silicon steel (GOSS) C-cores deliver superior magnetic performance with high grain orientation, offering numerous advantages over traditional stacked laminated cores. The Bridgeport Magnetics CD Series provides easier winding assembly, excellent efficiency, and reliable operation in single and double-loop transformer and inductor designs.

For engineers and manufacturers, this translates to:

  • Easier core assembly and coil winding compared to E-I laminations
  • Higher magnetic efficiency and lower core losses at 50/60 Hz
  • More compact and cost-effective designs for higher power applications
  • Excellent scalability with 32 standard sizes plus full custom options
03 · Specifications

Specifications

Amorphous C-Cores
Stock Sizes – Click on Part # to Purchase
Silicon Steel C-Cores (GOSS C-Cores) 60 Hz and 50/60 Hz Frequencies
Item Part Number VA @ 50Hz VA @ 60Hz E (mm) D (mm) F (mm) G (mm) Weight (Kg) Weight (lbs)
1 CD10x12.5×20 2 2.4 10 12.5 12.5 20 0.0832 0.18
2 CD10x12.5×25 3 3.6 10 12.5 12.5 25 0.0925 0.20
3 CD10x12.5×32 4 4.8 10 12.5 12.5 32 0.105 0.23
4 CD10x12x40 6 7.2 10 12.5 12.5 40 0.119 0.26
5 CD12.5x16x25 10 12 12.5 16 16 25 0.168 0.37
6 CD12.5x16x32 14 17 12.5 16 16 32 0.188 0.41
7 CD12.5x16x40 19 23 12.5 16 16 40 0.21 0.46
8 CD12.5x16x50 25 30 12.5 16 16 50 0.238 0.52
9 CD12.5x25x30 31 37 12.5 25 20 30 0.302 0.67
10 CD12.5x25x40 43 52 12.5 25 20 40 0.346 0.76
11 CD12.5x25x50 54 65 12.5 25 20 50 0.39 0.86
12 CD12.5x25x60 63 76 12.5 25 20 60 0.434 0.96
13 CD16x32x40 89 107 16 32 25 40 0.641 1.41
14 CD16x32x50 111 133 16 32 25 50 0.713 1.57
15 CD16x32x65 143 172 16 32 25 65 0.821 1.81
16 CD16x32x80 171 205 16 32 25 80 0.93 2.05
17 CD20x40x50 199 239 20 40 32 50 1.26 2.78
18 CD20x40x60 231 277 20 40 32 60 1.37 3.02
19 CD20x40x80 306 367 20 40 32 80 1.6 3.53
20 CD20x40x100 375 450 20 40 32 100 1.82 4.01
21 CD25x50x65 448 538 25 50 40 65 2.51 5.53
22 CD25x50x80 540 648 25 50 40 80 2.77 6.11
23 CD25x50x100 659 791 25 50 40 100 3.12 6.88
24 CD25x50x120 776 931 25 50 40 120 3.48 7.67
25 CD32x64x80 1006 1207 32 64 50 80 5.15 11.35
26 CD32x64x100 1213 1456 32 64 50 100 5.57 12.28
27 CD32x64x130 1513 1816 32 64 50 130 6.57 14.48
28 CD32x64x160 1843 2212 32 64 50 160 7.45 16.42
29 CD40x80x100 2106 2527 40 80 64 100 10.1 22.27
30 CD40x80x120 2521 3025 40 80 64 120 11 24.25
31 CD40x80x160 3214 3857 40 80 64 160 12.8 28.22
32 CD40x80x200 3912 4694 40 80 64 200 14.6 32.19
04 · Proven Across Critical Industries

Toroidal Transformer Cores shine in high power density, versatile, low noise/EMI, high efficiency applications.

Battery Energy Storage Systems (BESS) and Inverters

High-power BESS inverters and energy storage transformers

Data Center UPS and Power Distribution

Large UPS transformers for data center power backup

Utility Grid Distribution and Protection

High-voltage utility distribution and protection transformers

Industrial Motor Drives and Heavy Machinery

Large industrial motor drive and automation transformers

Custom High-Power Isolation Transformers

Large medical and industrial isolation transformers

Built in Shelton, Connecticut

Let's build yours to spec.

Custom magnetics engineered and manufactured in the USA. Tell us your requirements and our engineers will help.

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05 · FAQ

Frequently Asked Questions

What are GOSS C-Cores and how do they compare to stacked laminations?

GOSS C-Cores are cold-rolled grain-oriented silicon steel cores with high magnetic alignment. They offer superior performance, easier assembly, and lower losses compared to traditional stacked E-I laminations in 50/60 Hz transformers and inductors.

We stock 32 standard sizes ranging from 5 VA to 5,000 VA (60 Hz, single loop). Larger custom C-Cores are available for high-power applications.

Yes. The CD Series is specifically designed for both single-loop and double-loop single-phase transformers, providing flexibility for various 50/60 Hz designs.

Rectangular phenolic tubes are available for all sizes, and zinc alloy cast clamping frames are offered for many sizes to simplify assembly and mounting.

C-Cores are widely used in industrial automation, utility grid equipment, renewable energy inverters, data center power systems, and large medical/industrial isolation transformers.

Our CD Series combines high-quality M4-011 material, fast stock availability, custom capabilities, and full vertical integration in Connecticut for reliable performance and shorter lead times.

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