GRL DNT3-R1R Semiconductor Fuse: Ultra-Rapid Protection for 1300V AC High-Power Systems

Model No.：

DNT3-R1R

Rated Voltage：

1000V DC

Current Range：

315~1100A

Breaking Capacity：

50kA

Protection Category：

Standards：

GB/T 13539.4 IEC 60269-4

Certifications：

CCC CE TUV

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Description

DNT3-R1R Semiconductor Fuse Overview

The GRL DNT3-R1R Semiconductor Fuse is a high-capacity, Ultra-Rapid Fuse Link specifically engineered to deliver instantaneous and absolute Power Semiconductor Protection in the most demanding high-voltage environments. Designed by GRL Fuse for systems operating up to an impressive AC 1300V Fuse, the DNT3-R1R is the premium choice for safeguarding expensive and sensitive components.

As a certified aR Fuse with a Square Body Fuse (Size 3) form factor, it is purpose-built for high-power, high-current applications. Its defining technical advantage is the assurance of an Extremely Low $I^2t$ Value. This minimal let-through energy is essential for preventing the thermal destruction of high-power devices like IGBTs and Thyristors during a fault. Choosing the DNT3-R1R guarantees superior System Reliability and extended operational life for your critical Power Electronics assets.

DNT3-R1R Semiconductor Fuse Technical Parameters

Model No.	Size	In (A)	I²t(A²S)		0.5In Power dissipation(W)	0.8In Power dissipation(W)	1.0In Power dissipation(W)	Weight (g)	Mounting
Model No.	Size	In (A)	Pre-Arcing	Fusing	0.5In Power dissipation(W)	0.8In Power dissipation(W)	1.0In Power dissipation(W)	Weight (g)	Mounting
DNT3-R1R-315A/1250V AC	3	315	13500	41100	29	53	97	1340±3%	M10 21±1N.m
DNT3-R1R-350A/1250V AC	3	350	17800	54100	32	58	107
DNT3-R1R-400A/1250V AC	3	400	24600	74800	36	65	120
DNT3-R1R-450A/1250V AC	3	450	34500	105000	39	70	129
DNT3-R1R-500A/1250V AC	3	500	46100	140000	41	75	136
DNT3-R1R-550A/1250V AC	3	550	62300	190000	44	79	145
DNT3-R1R-630A/1250V AC	3	630	91100	277000	48	86	159
DNT3-R1R-700A/1250V AC	3	700	130000	395000	50	91	165
DNT3-R1R-800A/1250V AC	3	800	195000	593000	54	99	181
DNT3-R1R-900A/1250V AC	3	900	285000	867000	57	105	191
DNT3-R1R-1000A/1250V AC	3	1000	393000	1200000	61	112	204
DNT3-R1R-1100A/1250V AC	3	1100	549000	1670000	63	116	213

Click to read： How do semiconductor fuse links protect against short-circuit conditions?

DNT3-R1R Semiconductor Fuse Features

The DNT3-R1R Fuse Link achieves its industry-leading Ultra-Rapid performance through innovative construction:

Optimized High-Purity Silver Elements: The internal fuse elements are meticulously designed using pure silver with precisely sized necks. This design ensures they melt and vaporize in microseconds during a fault, confirming its status as a true Fast Acting Fuse.
High-Density Arc-Quenching Filler: The ceramic tube is packed with high-purity quartz sand. This filler material rapidly absorbs the energy from the high-voltage arc, ensuring that even under maximum fault conditions, the 100kA High Interrupting Capacity is achieved safely and successfully.
Advanced Current Limiting Fuse Action: The fuse functions by introducing a high resistance into the circuit immediately upon melting, generating an arc voltage that effectively drives the fault current to zero before it reaches its destructive peak. FAQ: Why is Current Limiting essential at 1300V AC? At high voltages, the available fault energy is enormous. The DNT3-R1R’s Current Limiting Fuse capability is vital because it drastically reduces the mechanical and thermal forces on downstream components, ensuring the safety and longevity of your entire system.

DNT3-R1R Semiconductor Fuse Advantages

Maximize uptime and minimize replacement costs with the GRL DNT3-R1R.

Unmatched Thermal Protection: The minimal Low $I^2t$ Value provides a near-absolute safety guarantee for your silicon-based components, making it the most reliable solution for Thyristor Protection.
Built for Extreme Systems: With its dedicated AC 1300V Fuse rating and Size 3 Fuse capacity, this product is the backbone of high-power conversion in Medium Voltage Industrial Fuse applications.
Global Standard Compliance: Fully compliant with IEC 60269-4, this fuse is approved for use in international projects, simplifying procurement and ensuring technical compatibility worldwide.

DNT3-R1R Semiconductor Fuse Applications

The GRL DNT3-R1R Semiconductor Fuse is indispensable across various high-power sectors:

Renewable Energy: Protection of central High-Voltage Solar Inverter systems and main converter stacks in large Wind Power Converter substations.
Transportation: Providing robust Circuit Protection for the primary Rail Traction Converter units and critical auxiliary supplies in electric mass transit.
Industrial Drives: Securing the massive semiconductor bridges in high-kilowatt Variable Frequency Drive (VFD) systems and industrial soft starters.
Power Quality: Used in Static VAR Compensators (SVCs) and other grid-stabilizing Power Electronics equipment.

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DNT3-R1R Semiconductor Fuse FAQs

Q1: Is the GRL DNT3-R1R a full-range protection fuse?

A: No, the DNT3-R1R is a specialized aR Fuse, meaning it provides instantaneous Short-Circuit Protection only. It is not designed for continuous overload protection (gG characteristic). This narrow focus allows it to achieve the Ultra-Rapid speed necessary for Power Semiconductor Protection, which is its sole function. Overload protection for the cables should be provided by separate devices.

Q2: What is the significance of the Size 3 Fuse designation?

A: The Size 3 designation indicates that the DNT3-R1R is one of the largest standard sizes in the DIN 43653 standard, allowing it to handle significantly higher currents (up to 1250A) while maintaining the superior 1300V AC Fuse rating. This high capacity makes it suitable for major power conversion equipment where component density and current ratings are maximized.

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