GRL DNS51-M1L Semiconductor Fuse Link 800V Factory Direct Sales

Parameter：

DNS51-M1L

Rated Voltage：

800V DC

Current Range：

225~600A

Breaking Capacity：

50kA

Protection Category：

Time Constant：

10~15ms

Standards：

GB/T 13539.4 IEC 60269-4

Certifications：

CCC CE TUV

Certification Contact Us

Description

DNS51-M1L Semiconductor Fuse Link Overview

The GRL DNS51-M1L is a high-speed 800V DC semiconductor fuse link designed to protect power electronic circuits. It acts as an industrial fuse in DC systems, interrupting short circuits and overloads before sensitive devices are damaged. Compact yet rugged, this HRC (High Rupturing Capacity) fuse link safeguards inverters, semiconductor modules, and battery systems across industries. It is widely used in rail transit, electric vehicle (EV) power systems, renewable energy power stations, communication, and other industrial equipment. By combining fast interruption and high breaking capacity, the DNS51-M1L provides reliable circuit protection and fuse safety in demanding environments.

DNS51-M1L Semiconductor Fuse Link Technical Parameters


Model No.	Size	In (A)	I²t(A²S)		0.5In Power dissipation(W)	0.8In Power dissipation(W)	1.0In Power dissipation(W)	Weigh(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)	Weigh(g)	Mounting
DNS51-M1L-225A/800V DC	φ51	225A	8500	29500	7	24	44	471±3%	M10 21±1N.m
DNS51-M1L-250A/800V DC	φ51	250A	11900	39900	7.8	25.5	47
DNS51-M1L-315A/800V DC	φ51	315A	19000	67500	9.5	32	58
DNS51-M1L-350A/800V DC	φ51	350A	23700	86500	11.5	35	64
DNS51-M1L-400A/800V DC	φ51	400A	32000	105000	14	42	77
DNS51-M1L-450A/800V DC	φ51	450A	41500	132000	18	52	95
DNS51-M1L-500A/800V DC	φ51	500A	56000	168000	20	57	105
DNS51-M1L-550A/800V DC	φ51	550A	65300	196000	22.5	62	113
DNS51-M1L-600A/800V DC	φ51	600A	76600	249000	25	67	122

GRL DNS51-M1L: Ultra-Rapid DC 800V Semiconductor Fuse for Uncompromising Power Protection

The GRL DNS51-M1L Semiconductor Fuse Link is the definitive choice for engineers demanding uncompromised safety and performance in modern high-power DC systems. Classified as an aR (Semiconductor Protection) fuse, its primary characteristic is its ultra-rapid, current-limiting operation, a feature crucial for safeguarding expensive and highly sensitive power components such as IGBTs and MOSFETs, which can be destroyed in milliseconds by fault currents. Unlike standard fuses, the DNS51-M1L ensures component longevity by delivering an extremely low $I^{2} t$ value (let-through energy), successfully interrupting the circuit before the damaging energy threshold of the protected device is reached. This fundamental speed and precision guarantee component integrity and minimize the risk of expensive hardware replacement.

Engineered for the evolving power landscape, the DNS51-M1L is rated for high DC voltages, specifically up to DC 800V, making it perfectly suited for the advanced architectures of New Energy applications like solar PV inverters and EV charging infrastructure, as well as providing critical fault isolation within Energy Storage Systems (ESS). Furthermore, its high interrupting capacity (HIC) ensures that it can safely clear catastrophic fault currents without incident, maintaining system integrity and enhancing safety in essential infrastructure like Telecommunications and Data Centers. Available across a wide current range (35A to 800A), the GRL DNS51-M1L provides a versatile and reliable solution that guarantees system uptime and mitigates the risk of cascade failures across your most critical power electronics applications.

GRL DNS51-M1L: Ultra-Fast DC 800V Protection for System Uptime and Reliability

1、Ultra-Fast Semiconductor Protection:

Provides an essential layer of high-performance DC protection with extremely fast short-circuit clearance capability.

2、High-Voltage DC Application Suitability:

Engineered for high-voltage systems, with a rated voltage up to DC 800V and a high interrupting current rating.

3、Enhanced System Uptime and Reliability:

Ensures component longevity and system uptime by preventing cascade failures caused by surges or faults.

4、Critical for Energy Storage Safety:

Offers critical fault isolation in Energy Storage Systems (ESS) for battery arrays, DC/DC converters, and inverters.

5、Reliable Telecom Infrastructure Support:

An ideal choice for providing stable, swift, and high-capacity protection for Telecom and Data Center DC power systems.

DNS51-M1L Semiconductor Fuse Link Applications

1、New Energy Power Conversion Systems

Focus: Protection within the high-voltage DC architectures of renewable energy sources.

Examples: Safeguarding power semiconductors like IGBTs and MOSFETs in solar PV inverters, wind turbine systems, and Electric Vehicle (EV) charging infrastructure.

2、Energy Storage Systems (ESS)

Focus: Providing fault isolation and safety for large-scale battery management.

Examples: Critical safety component protecting the battery array, DC/DC converters, and inverters within both utility-scale and commercial/residential battery storage solutions.

3、Telecommunications and Data Centers

Focus: Ensuring stable and continuous DC power supply for essential communication hardware.

Examples: Protection for rectifiers, power supply units (PSUs), and various DC distribution circuits in base stations, data centers, and other critical telecom facilities.

4、General High-Voltage DC Circuit Protection

Focus: Any system requiring extremely fast, high-voltage DC short-circuit protection for power electronics.

Examples: Protecting semiconductor components and their complete equipment in systems operating up to DC 800V where precise, rapid-acting fault clearance is required to prevent component damage.

DNS51-M1L Semiconductor Fuse Link Maintenance Tips

Download Datasheet

For complete technical details and the latest fuse specifications, please download the GRL DNS51-M1L Datasheet. This datasheet (PDF) includes full performance curves, dimensions, and installation guidelines. Contact our sales team or local distributor to discuss pricing, availability, and application support.

DNS51-M1L Semiconductor Fuse Link FAQs

1. What is the GRL DNS51-M1L designed to protect?

Answer: The DNS51-M1L is an aR (Semiconductor Protection) fuse link. It is specifically designed for the short-circuit protection of sensitive power semiconductor components and their complete equipment. This primarily includes devices like IGBTs (Insulated Gate Bipolar Transistors), MOSFETs, Diodes, and SCRs used in high-power conversion systems.

2. What are the key voltage and current ratings for the DNS51-M1L series?

Answer: The DNS51-M1L series is built for DC (Direct Current) applications.Rated Voltage (Un): Up to DC 800V.Rated Current (In): The series generally covers a wide range from 35A to 800A (always refer to the specific part number datasheet for exact ratings).

3. Why is a “Semiconductor Fuse” required instead of a standard fuse?

Answer: Power semiconductor devices are extremely sensitive to overcurrent, with very low thermal mass. They can be destroyed in milliseconds during a short-circuit event.

Standard Fuses are too slow and have a high let-through energy ( $I^{2} t$ ).The DNS51-M1L is an ultra-rapid/high-speed fuse, providing an extremely fast response time (low pre-arcing time) and a low $I^{2} t$ value. This speed is critical to interrupt the fault current before it can reach a level that permanently damages the expensive power semiconductor.

4. Can the DNS51-M1L be used in AC (Alternating Current) circuits?

Answer: No. The GRL DNS51-M1L is explicitly designed and rated for DC systems (DC 800V). DC circuits are much more difficult to interrupt than AC circuits because the current never naturally drops to zero. Using a DC-rated fuse in an AC circuit (or vice-versa) can be unsafe and may lead to the fuse failing to clear a fault properly. For AC applications, GRL offers different series (e.g., DNT or NGT series) with specific AC voltage ratings.

5. Where does the DNS51-M1L fit within New Energy and Energy Storage Systems?

Answer: It serves as a vital safety barrier in high-power sections:

New Energy: Protecting the power stage of Solar Inverters and EV Charging Piles.

Energy Storage (ESS): Providing fault isolation for the Battery Disconnect Switches, DC/DC Converters, and the inverter/rectifier units connected to the battery bank, preventing massive cascade failures.

6. What is the significance of the fuse’s $I^{2} t$ rating?

Answer: The $I^{2} t$ (Ampere-Squared-Seconds) value represents the total amount of energy that passes through the fuse element during the short-circuit condition, from the start of the fault until the circuit is fully cleared.Importance: To ensure protection, the fuse’s $I^{2} t$ (let-through energy) must be less than the semiconductor device’s $I^{2} t$ withstand capability. The DNS51-M1L series is engineered with a very low $I^{2} t$ to effectively protect these sensitive components.