GRL DNT3-R1N: Defining High-Performance AC Protection (1250V AC, 100kA)
Elevating Safety Standards in High-Voltage AC Converters
The GRL DNT3-R1N Ceramic Semiconductor Fuse Link is engineered for the extreme protection demands of high-power AC systems. This fuse series specifically targets applications requiring safe, reliable interruption at an elevated nominal voltage of AC 1250V, combined with a substantial current capacity spanning 315A to 1100A. The DNT3-R1N stands out with its formidable 100kA interrupting rating, making it the essential protective layer in environments where massive short-circuit currents are a reality.
The DNT3-R1N Core: Precision I²t at 1250V AC
For designers of medium-voltage drives and high-capacity AC systems, the fuse’s speed and reliability are paramount. As an aR-class device, the DNT3-R1N offers the ultra-fast response time necessary to protect delicate silicon components like AC-side Thyristors and GTOs.
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Minimizing Thermal Stress: The fuse is optimized to deliver the lowest possible I²t (let-through energy). This crucial characteristic ensures that even under severe 100kA faults, the thermal energy passed to the protected component remains below its damage threshold.
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AC Arc Management: Unlike DC systems, AC interruption benefits from natural zero-crossing.1 However, at 1250V AC, high current arcs are still incredibly destructive. The GRL ceramic structure and specialized element design ensure rapid, contained, and reliable extinction across the full 315A–1100A range.
Key Performance Matrix
| Specification | GRL DNT3-R1N Series | Impact on System Design |
| Rated Voltage | AC 1250V | Essential for medium-voltage system front-end protection. |
| Rated Current Range | 315A – 1100A | Ideal for high-capacity industrial drives and rectifiers. |
| Interrupting Rating | 100kA | Provides exceptional safety margin against severe industrial faults. |
| Protection Class | aR (Ultra-Fast) | Guarantees precision protection for power semiconductors. |
Targeted Applications for AC 1250V, 100kA
The unique combination of high AC voltage and high fault capacity positions the DNT3-R1N as the ideal choice in demanding industrial and power distribution environments:
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Medium-Voltage Drives (MVDs): Input rectifier protection in MVD systems where the nominal supply voltage is elevated.
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Industrial Power Supplies: Securing high-power AC-to-DC rectifiers utilized in metallurgical, chemical, and mining processes.
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Capacitor Banks & Filters: Protection for high-energy AC filter circuits where fault currents can escalate rapidly.
Choosing GRL: Reliability and Expertise
The ceramic construction provides superior mechanical integrity and thermal performance required for continuous operation at high amperage and voltage. By selecting the GRL DNT3-R1N, you are not just choosing a fuse; you are integrating a high-precision safety device capable of safeguarding your most critical and expensive AC 1250V components against severe 100kA short-circuit events.
Speak to an AC Protection Expert
Ready to specify the safest solution for your high-voltage AC power converters? Contact our GRL specialists today for detailed technical schematics, I²t coordination data, and expert support to integrate the DNT3-R1N into your 315A–1100A AC systems.
