Anti-surge Wirewound Low-Temperature Fuse Resistor and Manufacturing Method
Taiwan Patent No. I637420
As modern power systems advance toward higher power density, enhanced reliability, and stringent safety standards, protective components have become essential in electronic design. Firstohm’s patented technology, "Anti-Surge Wirewound Fast-Fuse Resistor and Manufacturing Method", uniquely combines surge endurance with rapid fuse protection. This breakthrough enables a single device to deliver resistance functionality, withstand high surge energy, and safeguard against abnormal current conditions.
At the core of this innovation is a specially engineered low-melting-point connecting wire. This design preserves the superior surge tolerance of wirewound resistors while ensuring immediate fuse action during overloads, short circuits, or abnormal current events. By integrating these dual capabilities, the technology significantly enhances circuit safety, improves system reliability, and simplifies protection design for demanding applications.
Core Patent Information
| Patent Title | Anti-Surge Wirewound Low-Temperature Fuse Resistor and Manufacturing Method |
|---|---|
| Patent Type | Taiwan Invention Patent |
| Patent No. | I637420 |
| Application Date | June 29, 2017 |
| Publication Date | October 1, 2018 |
| Assignee | FIRST RESISTOR & CONDENSER CO., LTD. |
| Inventor | Li Shang-Yu |
| Technical Field | Fuse resistors, surge protection devices, power protection technology |
Technical Challenges
Traditional fuse resistors used in industrial power supplies and electronic equipment often face several design challenges:
- Insufficient fuse response speed
- Continuous abnormal current damaging downstream components
- Difficulty balancing surge resistance with fuse characteristics
- Limited design space for protective components
As power systems continue to require higher safety and reliability, demand is increasing for components that combine high surge endurance with fast fuse protection.
Patent Technology Core
This patented technology introduces a dual-section wirewound structure on an insulating rod, electrically connected through a specially designed low-melting-point conductor.
Under normal operation, current flows steadily through the wirewound resistor structure. When abnormal overcurrent occurs, the low-melting-point conductor heats and fuses first, quickly cutting off the current path and reducing the risk of fault energy transferring to downstream components.
- High surge endurance
- Fast fuse protection
- Stable resistance characteristics
- Enhanced system safety
Technical Advantages
- Dual Protection: Combines wirewound surge resistance with low-temperature fuse action.
- Rapid Abnormal Protection: The low-melting-point conductor enables fast cutoff under fault conditions.
- Improved Reliability: Concentrated protection reduces the risk of unpredictable component failure.
- Simplified Circuit Design: One component integrates current limiting, surge resistance, and fuse protection.
- Enhanced Product Safety: Supports safety and reliability validation in power and industrial applications.
Application Fields
This patented technology is ideal for high-reliability and safety-critical systems, including:
- Industrial power supplies
- Industrial control equipment
- Communication devices
- Power electronics modules
- Renewable energy systems
- Electric vehicle charging systems
- Motor drive and protection systems
Customer Value
| Customer Need | Technical Value |
|---|---|
| Improve equipment safety | Fast fuse protection against abnormal current |
| Increase surge endurance | Retains the surge resistance advantage of wirewound resistors |
| Reduce system failure risk | Prevents fault energy from transferring downstream |
| Simplify protection design | Integrates current limiting and fuse protection |
| Enhance product reliability | Strengthens critical protection mechanisms |
Technical Abstract
Firstohm's invention patent "Anti-Surge Wirewound Low-Temperature Fuse Resistor and Manufacturing Method" combines the surge endurance of wirewound resistors with a rapid fuse mechanism enabled by a low-melting-point conductor. This technology enhances abnormal current protection, reduces system damage risk, and provides a comprehensive solution for high-reliability power protection applications.
Firstohm's Technology Commitment
Since its founding in 1969, Firstohm has continuously focused on high-reliability resistor technology innovation. Through ongoing patent development and process innovation, Firstohm helps global customers build safer, more stable, and more competitive electronic products.
- Specification
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Anti-Surge Wirewound Fast-Fuse MELF Resistor
Anti-Surge Wirewound Fast-Fuse MELF Resistor is the same as SWM series but specially add fusible function.
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