GRL DNH1-315/30LM Fuse Switch Disconnector 800V AC Use NH0 fuse link

 Fuse Switch Disconnector DNH1-315/30LM Technical Parameters

The GRL DNH1-315/30LM Fuse Switch Disconnector: Precision Protection for 800V AC Systems

1. Introduction and Product Overview

The GRL DNH1-315/30LM Fuse Switch Disconnector represents a critical component in advanced low-voltage power distribution and control systems. It is engineered to perform the dual function of reliable power isolation and high-speed fault protection, making it indispensable in circuits where continuous operation and safety are paramount.

Specifically designed for an 800V AC operating environment and rated for a continuous operational current of 315A, the DNH1-315/30LM is ideally suited for demanding applications in renewable energy, heavy industry, and specialized machinery. Its construction is optimized for use with NH0 fuse links, ensuring compliance with global protection standards while delivering a high degree of performance security.

The DNH1-315/30LM Fuse Switch Disconnector is a new product specially designed by our company to meet the market demands of wind power box transformers and other equipment. It features an attractive appearance and a compact structure, and can be used for line isolation. It also has functions such as overload and short-circuit protection.

Click to download product catalog DNH1 Series Fuse Switch Disconnector

2.1. High-Voltage and Breaking Capacity

• 800V AC Operation: The Rated operating voltage Ue of 800V AC is a distinguishing feature, making this switch ideal for system architects designing highly efficient power conversion systems and industrial lines that utilize this specific voltage level.

• Superior Short-Circuit Protection: With a Rated short-circuit current Iq of 50kA (when fitted with the appropriate fuse), the DNH1-315/30LM offers a formidable level of protection against catastrophic fault conditions, preserving costly downstream equipment.

2.2. Robust Insulation and Endurance

• Insulation Safety Margin: The high Rated insulation voltage Ui of 1500V provides a significant safety margin above the operating voltage, enhancing system reliability and preventing insulation breakdown.

• Transient Immunity: A Rated impulse withstand voltage Uimp of 12kV indicates exceptional resistance to high-energy voltage spikes caused by switching operations or external factors like lightning, ensuring device longevity.

3. Fuse Link Integration and Versatility

The DNH1-315/30LM is engineered for seamless integration with the NH0 fuse link. The flexible power consumption compatibility allows for tailored circuit protection:

• Fuse Size: It accommodates Size 0 fuses, a common and readily available standard.

• Power Consumption Flexibility: The device supports fuses with varying power consumption (Pn), from less than or equal to 10W (<= 10W) to less than or equal to 48W (<= 48W), depending on the required rated operating current (In). This range allows the use of different fuse types—such as gG (general purpose) or aR (semiconductor protection)—to achieve the desired speed and curve characteristics.

4. Installation, Operation, and Safety Features

The design incorporates several features that streamline installation and maximize safety:

• Mounting: The switch is specified for Fixed installation and requires Vertical installation, standard requirements for maximizing arc clearance and contact integrity in switchgear assemblies.

• Operating Force: The maximum Operating force is less than or equal to 150N (<= 150N), confirming an ergonomic design for safe and effective manual switching.

• Protection Level: The device offers a high degree of protection, rated IP20 when the switch is ON and IP30 when the switch is OFF, safeguarding personnel from contact with internal components.

• Accessories: For enhanced system integration, the device supports ordered accessories, including one normally open and one normally closed, mechanical fuse monitoring, and spaced partition boards. These accessories provide remote status signaling and physical safety barriers.

5. Specialized Application in Semiconductor Protection

A critical note regarding its use in highly sensitive applications is the adjustment factor for semiconductor protection:

• Semiconductor Equipment Protection: When the DNH1-315/30LM is used to protect aR-type semiconductor equipment fuses, the current capacity must be derated. The reduction coefficient is typically between 0.5 and 0.7. This essential guidance ensures the longevity and selective operation of high-speed semiconductor fuses, crucial for protecting devices like SCRs and IGBTs within VFDs and power supplies.

6. Target Application Fields

The DNH1-315/30LM’s specifications make it an essential element in the following critical environments:

• Renewable Energy: Used in high-power solar PV and battery energy storage systems (BESS) where 800V AC is employed for efficient power conversion and distribution.

• Industrial Control & Automation: Providing main feeder protection in Motor Control Centers (MCCs) and protecting the input stages of high-voltage Variable Frequency Drives (VFDs) and rectifiers.

• Utility Switchgear: Integrated into custom-built 800V AC distribution cabinets where a high Iq (50kA) rating and physical isolation are mandatory safety requirements.

DNH1 Fuse Switch Disconnector Wiring method

The GRL DNH1-315/30LM Fuse Switch Disconnector is a robust and technically advanced solution for modern 800V AC electrical infrastructure. Combining a high rated current (315A) with exceptional breaking capacity (50kA), and designed for reliable use with NH0 fuse links, it provides engineers with a secure, standards-compliant device for protection and isolation. Its attention to insulation quality (1500V Ui, 12kV Uimp) and safety features ensures enduring performance in the most demanding industrial and energy sector applications.

DNH1 Fuse Switch Disconnector Product Showcase

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