The U120B porcelain insulator is a disc-type insulator with a minimum mechanical failure load of 120kN, a nominal diameter of 255mm, a height of 146mm, and a creepage distance of 320mm. Its power frequency breakdown voltage is 110kV.Multiple U120B porcelain insulators can be connected in series to form a suspension insulator string, suitable for high-voltage transmission lines up to 330kV.
Product Detail
Zhexi manufactures U120B Porcelain 120kN Disc Insulator designed for overhead transmission systems requiring high mechanical strength and reliable electrical insulation performance.
With a rated mechanical strength of 120kN, this ceramic porcelain insulator is suitable for demanding transmission applications where conductors experience high mechanical loads.
As part of our ceramic porcelain insulator solutions, U120B provides stable performance for power utilities, EPC contractors, and electrical infrastructure projects.
The 120kN mechanical load rating allows U120B porcelain disc insulators to support heavier conductors and withstand demanding installation conditions.
Manufactured from electrical porcelain materials, the insulator provides excellent dielectric strength and stable insulation performance.
The glazed porcelain surface provides resistance against:
Moisture
Pollution
Temperature variation
Outdoor aging
| Item | Specification |
|---|---|
| Product Type | Porcelain Disc Insulator |
| Model | U120B |
| Mechanical Strength | 120kN |
| Material | Electrical Porcelain |
| Application | Overhead Transmission Line |
| Installation | Insulator String System |
U120B porcelain disc insulators are commonly used in:
High voltage transmission lines
Heavy conductor applications
Long-span overhead lines
Power grid construction projects
When selecting a 120kN porcelain insulator, engineers usually consider:
Mechanical load requirement
Voltage level
Creepage distance
Environmental conditions
Installation structure
For projects requiring higher mechanical performance, U120B provides a reliable insulation solution.
Product Parameters
| IEC Class | U120B | U160BM | U160BL | U210B | U240B | U300B |
| Coupling size | 16 | 20 | 20 | 20/24 | 24 | 24 |
| Diameter (mm) | 255 | 280 | 280 | 280 | 280 | 280 |
| Spacing (mm) | 146 | 155 | 170 | 170 | 170 | 195 |
| Creepage distance (mm) | 320 | 350 | 380 | 380 | 405 | 390 |
| Combined M&E strength (kN) | 120 | 160 | 160 | 210 | 240 | 300 |
| Impact strength (N.m) | 10 | 10 | 10 | 11.3 | 11.3 | 11.3 |
| Routine proof test load (kN) | 60 | 80 | 80 | 105 | 120 | 150 |
| power frequency dry withstand voltage (kV) | 70 | 75 | 75 | 75 | 75 | 75 |
| power frequency wet withstand voltage (kV) | 40 | 42 | 42 | 42 | 45 | 45 |
| Dry lightning impulse withstand voltage (kV) | 100 | 110 | 110 | 110 | 110 | 130 |
| Power frequency puncture voltage (kV) | 110 | 110 | 110 | 120 | 120 | 130 |
| Test voltage RMS to ground (kV) | 10 | 10 | 10 | 10 | 10 | 10 |
| Maximum RIV at 1000kHz (kV) | 50 | 50 | 50 | 50 | 50 | 50 |
| Net weight,approximate (kg) | 5.6 | 7.4 | 7.8 | 10.4 | 11.1 | 14.3 |
FAQ
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A
Can we print our trademark or company name on your product or package?
OEM and ODM orders are warmly welcomed, we have rich successful experience in OEM projects. In addition, our R&D team will provide you with professional suggestions.
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How does your company do in terms of quality control?
1) We choose all raw materials to be of high quality.
2) Professional and skilled workers pay attention to every detail in handling the production process.
3) The quality control department is specialized in quality inspection for each process.
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How can I get samples to test your quality?
We can provide free samples for you to test and check, just bear the freight cost.
Contact us to know more about our products, our professional team will serve you and customize it according to your requirements.
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