DNT2-R1R Semiconductor Fuse Link Overview
The GRL DNT2-R1R is a high-capacity, ultra-rapid fuse link engineered for the demanding protection of power semiconductor components in high-voltage alternating current (AC) systems. As a key component in GRL’s DNT series, the DNT2-R1R is categorized under the aR protection class, specifically designed to safeguard fast-switching devices like IGBTs, Thyristors, and MOSFETs from critical short-circuit currents.With a high-rated voltage of AC 1000V and a current range from 350A to 800A, this fuse size (Size 2) is purpose-built for high-power conversion applications. Its core function is to provide immediate, highly reliable fault clearance, thereby ensuring the longevity and operational integrity of expensive power electronics modules.
DNT2-R1R Semiconductor Fuse Link Features
The DNT2-R1R delivers industry-leading performance essential for high-power density applications
- Rated Voltage: AC 1000V. Suitable for advanced medium-voltage power systems in industrial and renewable energy sectors.
- Protection Category: aR (Short-Circuit Protection for Semiconductors). Guarantees extremely fast response to short-circuit faults.
- High Interrupting Capacity (HIC): 100kA. Ensures safe and effective interruption of massive fault currents without destructive results.
- Ultra-Rapid Response: Features a minimal pre-arcing time and an exceptionally low I2t value (let-through energy), which is the most critical factor in preventing semiconductor damage.
- Mounting Type (R): Utilizes a screw connection type with the contact knife rotated 90°, optimizing integration and providing secure mounting stability in constrained chassis spaces.
- International Compliance: Designed to meet stringent international standards, including IEC 60269-4
DNT2-R1R Semiconductor Fuse Link Applications
The high-power rating and aR characteristics of the DNT2-R1R make it indispensable across several critical high-power industries
DNT2-R1R Semiconductor Fuse Link FAQs
1. What is the main difference between the DNT2-R1R and other fuses in the DNT series?
Answer: The DNT2-R1R belongs to the Size 2 group within the DNT series. Its primary distinction is its higher rated current range (350A to 800A) and its high Interrupting Capacity of 100kA. This makes it specifically suitable for larger power applications with higher current density, such as large-scale rail traction converters and Megawatt-class renewable energy systems.
2. What are the key features and advantages of the DNT2-R1R’s “R” type mounting?
Answer: The “R” type mounting utilizes a bolt-down connection with the knife contact rotated 90 degrees. The advantages of this design are:
- Space Optimization: The 90-degree rotated contact allows for more efficient layout and density within constrained electrical cabinets or converter chassis.
- Connection Security: Bolt-down fixing ensures a highly reliable connection that withstands severe vibration (critical for applications like rail transport) and guarantees minimal contact resistance at high currents.
3. How does the DNT2-R1R ensure high system reliability in AC 1000V applications?
Answer: The DNT2-R1R ensures reliability in AC 1000V systems through:
- 100kA High Interrupting Capacity (HIC): Guarantees that the fuse can safely and reliably interrupt massive fault currents, controlling fault energy even during the most severe short-circuit events.
- aR Ultra-Rapid Response: The extremely low I2t value swiftly limits the fault current, protecting high-value IGBTs and Thyristors from thermal damage.
- Thermal Stability: It is designed for high power dissipation, ensuring stable performance during continuous operation under heavy loads and elevated ambient temperatures.
4. What is the role of the DNT2-R1R in large Industrial Motor Drives (VFDs)?
Answer: In large Variable Frequency Drives (VFDs), the DNT2-R1R is typically installed at the input side and on the DC Bus to protect:
- Rectifiers: Preventing damage to rectifier diodes from input-side transients or short-circuit faults.
- Inverters: Protecting the internal IGBT modules from short-circuit faults that may occur on the output side or the DC bus.
5. Can the DNT2-R1R be used in DC (Direct Current) systems?
Answer: The DNT2-R1R series is specifically designed and certified for AC 1000V systems. While some semiconductor fuses may have dual ratings, to ensure safe arc extinction and reliable interruption in high-voltage DC systems (such as DC 1000V), we strongly recommend consulting GRL’s dedicated DC-rated semiconductor fuse series.
6. Besides current and voltage, what is the most critical technical parameter when selecting the DNT2-R1R?
Answer: The most critical parameter is the I2t value (let-through energy). When selecting the fuse, engineers must ensure that the fuse’s clearing I2t value is significantly lower than the withstand I2t value of the semiconductor component (e.g., the IGBT module) it protects. The DNT2-R1R datasheet provides detailed I2t data to support this precise coordination.
