Ring Type Iron Core for Electric Transformer
Oct 15, 2025
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Ring Type Iron Core
The ring type iron core for electric transformer is a core component specially designed to improve the magnetic coupling efficiency of transformers. With the advantages of low magnetic leakage, low loss, and small size, it can significantly reduce the energy waste of transformers and meet the needs of transformers in all scenarios from power distribution to high-frequency electronics.

Why do transformers prefer ring-shaped iron cores
- Higher magnetic energy utilization rate
- More stable operation
- Better volume and weight
Factors to Consider when Choosing Toroid Core Material:
1. Frequency Range:
The frequency of your power system plays a significant role in selecting the appropriate toroid core material. Some materials perform better at low frequencies, while others excel at high frequencies. Understanding your system's frequency range is crucial to ensure optimal performance and efficient power transmission.
2. Power Requirements:
Consider the power requirements of your transformer system. Different core materials exhibit varying power handling capabilities. Choosing a core material with suitable power ratings ensures that your transformer operates within safe parameters and delivers the required output power.
3. Core Losses:
Core losses, including hysteresis and eddy current losses, affect the efficiency of the transformer. By selecting a toroid core material with low core losses, you can minimize energy wastage, reduce heating, and enhance overall system efficiency.
4. Saturation Level:
The saturation level of a toroid core material determines its ability to handle high magnetic flux densities. It is crucial to choose a core material that can operate within your desired magnetic field strength without saturating, as saturation leads to energy loss and compromised performance.
5. Temperature Stability:
Power transformers often operate in demanding environments where temperature variations are common. Select a toroid core material that offers high thermal stability to ensure consistent performance and mitigate the risk of thermal stress-related failures.
ring core specification
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| Magnetic core size(mm) | Protective box size(mm) | Effective cross-sectional area Ae(mm2) | Magnetic path length Ie(mm) | Maximum DC overcurrent class (A) |
||||||
| id | od | ht | ID | OD | HT | |||||
| 14 | 19 | 6.5 | 12 | 22 | 8 | 11.86 | 51.81 | 20 | ||
| 14 | 20 | 10 | 12 | 22.3 | 11.4 | 29.68 | 52.29 | 40 | ||
| 16 | 21 | 10 | 15 | 24 | 12.3 | 24.85 | 57.41 | 60 | ||
| 16 | 23 | 8 | 15 | 24 | 9.7 | 20.44 | 61.23 | 60 | ||
| 16 | 23 | 10 | 15 | 24 | 12.3 | 34.62 | 59.92 | 60 | ||
| 17 | 22 | 10 | 15.3 | 24.4 | 12.3 | 24.86 | 60.59 | 60 | ||
| 17 | 21 | 8 | 15.3 | 24 | 9.7 | 25.56 | 60.67 | 60 | ||
| 17 | 23 | 8 | 15.3 | 24.4 | 9.7 | 26.89 | 61.34 | 60 | ||
| 18 | 23 | 10 | 16.4 | 24.4 | 12.3 | 29.78 | 60.38 | 70 | ||
| 18 | 24 | 9 | 16.4 | 25 | 11.2 | 34.78 | 60.89 | 70 | ||
| 18 | 25 | 10 | 16.4 | 25.9 | 12.3 | 37.97 | 64.56 | 70 | ||
| 19 | 24 | 9 | 17.3 | 25 | 11.2 | 40.39 | 65.32 | 80 | ||
| 19 | 25 | 10 | 17.3 | 26 | 12.3 | 39.42 | 62.31 | 80 | ||
| 19 | 26 | 10 | 17.3 | 27.3 | 12.3 | 48.32 | 69.56 | 80 | ||
| 20 | 25 | 10 | 18.5 | 26.3 | 12.3 | 39.29 | 70.32 | 90 | ||
| 20 | 28 | 10 | 18.5 | 29 | 12.3 | 45.76 | 73.88 | 90 | ||
| 20 | 32 | 10 | 18.5 | 32.3 | 12.3 | 58.91 | 78.75 | 90 | ||
| 21 | 29 | 10 | 18.2 | 31.3 | 12.3 | 39.65 | 77.19 | 100 | ||
| 21 | 26 | 8 | 18.3 | 27.4 | 9.7 | 46.54 | 78.32 | 100 | ||
| 21 | 28 | 10 | 18.3 | 30 | 12.3 | 50.39 | 77.45 | 100 | ||
| 22 | 28 | 10 | 20.5 | 30 | 12.3 | 49.32 | 79.89 | 120 | ||
| 22 | 32 | 10 | 20.5 | 33.4 | 12.3 | 43.58 | 73.43 | 120 | ||
| 23 | 32 | 10 | 21.3 | 33.4 | 12.3 | 44.56 | 74.56 | 120 | ||
GNEE Featured Products
Gnee provides premium iron cores to the world. Our cores can be selected in a wide range of materials, shapes, applications, manufacturing techniques, etc., to meet customers' diverse demands. Explore our wide product range now~
Manufacturing Process

1. Raw Material Sourcing

2. Slitting

3. Punching

4. Laminating

5. Core Forming

6. testing
GNEE EC
Founded in 2008 and located in Anyang in China, Gnee Electric is a high-tech enterprise specializing in researching and manufacturing iron core products.
The company currently occupies over 20,000 square meters and employs more than 200 people, including over 80 professionals. After more than 18 years of development, we have built our own magnetic material production base and independently develope, produce, and sell various kinds of iron cores. The common types include silicon steel cores, motor cores, transformer cores, toroidal iron cores, special-shaped cores, custom cores, and others. Our cores are widely applied in different sectors including transformers, motors, mutual inductors, voltage stabilizers, welding machines, magnetic amplifiers, and instrumentation, providing diverse core solutions to global customers.

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Types of Products
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Why Choose GNEE EC?
GNEE EC was founded in 2008, which is a National High-tech Enterprise & Famous Brand Enterprise in China, developing into a professional manufacturer and supplier of high-quality iron cores.
18+
Over 18 years of success in the iron core industry;
National High-tech Enterprise & Famous Brand Enterprises in China;
200+
Over 200 employees;
The R&D team has more than 80 experienced engineers and the production team has more than 100 skilled staffs;
35+
Annual turnover up to 35 million dollor per year;
Owns many sets of highly automatic winding, annealing, and assembling machines;
1,000+
Over 1000 customers in domestic and overseas markets;
core Products are exported to more than 70 countries in the world;
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