GRL DNT3-R1L: Dual-Challenge Protection at 1250V AC and 100kA (315A–1100A)
Addressing the Intersection of High AC Voltage and Extreme Fault Capacity
The GRL DNT3-R1L Ceramic Semiconductor Fuse Link is meticulously engineered for highly demanding power conversion systems operating at elevated AC voltages. This product series provides the essential protection layer for circuits running at AC 1250V, handling substantial continuous currents from 315A up to 1100A. Its standout capability is the robust 100kA interrupting rating, making it the definitive choice for applications where severe short-circuit potential is inherent.
Engineering Focus: I²t Control Under AC 1250V Stress
For power electronics designers, the DNT3-R1L delivers reliability by minimizing the destructive energy released during a fault. As an aR-class device, its operation is characterized by an ultra-fast response tailored to semiconductor protection.
-
Minimizing Thermal Impact: The fuse achieves an extremely low I²t (let-through energy).2 This low value is critical, as it ensures that the immense thermal energy generated during a 100kA short circuit at high voltage is contained and cleared before it can reach the thermal tolerance limit of expensive power modules like AC-side Thyristors or high-voltage IGBTs.
-
High AC Voltage Integrity: The 1250V AC rating necessitates a specialized design to manage the high dielectric strength and thermal demands. The ceramic body provides the necessary insulation and structural rigidity to ensure safe and reliable interruption across the entire current range.3
Performance Summary: Beyond Standard Fusing
| Key Metric | DNT3-R1L Performance | Significance to High-Power Systems |
| Operating Voltage | AC 1250V | Optimized for medium-voltage system rectification and filtering stages. |
| Max Current Capacity | 1100A | Accommodates ultra-high-power industrial drives and converter inputs. |
| Fault Resilience | 100kA I.R. | Provides maximum safety against the highest potential fault currents. |
| Response Speed | aR Class | Ensures speed is matched to the millisecond-level reaction time of silicon. |
Strategic Applications in High-Power AC Systems
The DNT3-R1L’s unique specification combination makes it indispensable in critical industrial and utility environments:
-
Medium-Voltage Drives (MVDs): Primary protection for the AC front-end rectifier and smoothing circuits where nominal voltage exceeds 1000V.
-
Industrial Converters: Securing high-power AC input stages of large rectifiers used in heavy processing, where 100kA faults are a realistic threat.
-
AC Power Conditioning: Protection for high-energy AC filter banks and compensation systems where faults can escalate rapidly.
GRL DNT3-R1L: The Choice for Uncompromising Safety
Choosing the GRL DNT3-R1L means selecting a fuse that is engineered to handle the double burden of high AC voltage and extreme fault current. It offers the structural integrity and precision I²t control required to safeguard your most valuable assets in the 315A–1100A range.
Contact our GRL application experts today for detailed technical specifications, I²t coordination data, and personalized consultation to integrate this critical protection into your AC 1250V architecture.
