Mersen D320255 - Square Body High-Speed Fuse Protistor® NH Size 0 aR 690VAC IEC 700VAC UL 63A With Double indicator Plain Blades
Mersen

D320255

Alternate Item Number: NH0UD69V63PV

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Overview

The Mersen D320255 Protistor® NH Size 0 aR high-speed fuse-link provides precise semiconductor protection in power conversion systems, offering a robust solution for demanding applications. Engineered specifically for 690VAC (IEC) and 700VAC (UL) voltage ratings, this fuse-link delivers a reliable rated current of 63A. Its exceptional breaking capacity of 170kA ensures effective interruption of fault currents, safeguarding sensitive equipment. The internal construction features pure silver fuse elements meticulously embedded in solidified sand. This design is critical for achieving controlled arcing characteristics, which in turn leads to lower I²t values. This optimization is paramount for protecting power semiconductor devices such as diodes, thyristors, GTOs, and IGBTs, preventing damage from overcurrent events. The D320255 boasts a square body design that adheres to the DIN 43620/00 standard. This compliance ensures worldwide acceptance and seamless integration into NH modular system fuse-holders and fuse switch disconnectors, facilitating global deployment. Key features contributing to its performance and usability include silver-plated contact surfaces for superior conductivity and reduced contact resistance, as well as non-magnetic hardware to prevent unwanted magnetic interference. For enhanced operational awareness, optional low-voltage trip indicators are available, enabling microswitch activation to signal fuse operation. With a power dissipation of 12.5W at its rated current, the D320255 is designed for efficient thermal management within installations. The package weight of 0.2kg underscores its suitability for compact and weight-sensitive applications. The inclusion of a double indicator, coupled with plain blades, provides clear visual status confirmation of the fuse-link's condition and ensures straightforward integration into existing electrical systems. This fuse-link is an ideal choice for critical applications within industrial power electronics, motor drives, and renewable energy inverters where fast-acting and reliable fault protection is an absolute necessity.
  • Rated voltage: 690VAC (IEC) / 700VAC (UL)
  • Rated current: 63A with 170kA breaking capacity
  • Pure silver fuse elements for controlled arcing and low I²t
  • Square body NH Size 0 design compliant with DIN 43620/00
  • Optional low-voltage trip indicator for microswitch activation
  • Silver-plated contacts and non-magnetic hardware for reliability
  • Power dissipation: 12.5W at rated current
  • Package weight: 0.2kg with double indicator and plain blades

Specifications

AC Voltage Rating
700 V
Amperage Rating
63 A
Application
Protection of inverters, UPS systems, motor drives and similar 700V or less equipment.
Brand Name
Mersen
Case
Ceramic
Connection
Plain Blades
Connection Type
Plain Blades
Current Rating
63 A
Material
Pure silver, solidified sand
Mounting
Clip
Mounting Type
NH Modular System, Fuse-Holders, Fuse Switch Disconnectors
Series
Protistor®
Size
4.92 x 1.18 x 2.4 in
Size
125 x 30 x 61 mm
Size
NH Size 0
Special Features
Multiple body sizes aR Class according to VDE 636-23 and IEC 60269-4 Very low I²t for improved semiconductor protection Ultra fast acting Current limiting Superior cycling capability Indication system with double indicator
Standard
UL/CSA Recognized Component IEC 60269-4 Compliance
Sub Brand
Protistor®
Type
NH square Body High-Speed Fuse-Links AC Protection
Type Of Indicators
Double indicator
Voltage Rating
690/700 VAC
Voltage Rating
700 V
Wattage
23.6 W
Package Dimensions (L x W x H)
4.92 in x 1.18 in x 2.4 in
Package Dimensions (L x W x H)
125 mm x 30 mm x 61 mm
Package Weight (Imperial)
0.595 lb
Package Weight (Metric)
0.270 kg
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

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Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.