Mersen D330191 - Square Body High-Speed Fuse Protistor® Size NH 000 aR 500VAC IEC 400A DIN 80 Blades
Mersen

D330191

Alternate Item Number: DN000UB50V400


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Specification Sheet

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Overview

The Mersen D330191 Protistor® high-speed fuse-link, SKU D330191, offers critical semiconductor protection for power conversion systems. Rated at 400A with a 500VAC (IEC) / 700VAC (UL) operating voltage, this NH 000 size fuse is engineered for ultra-fast response to protect sensitive components like diodes, thyristors, and IGBTs. Its square body design features die-cut elements embedded in solidified sand, optimizing arcing characteristics to minimize I²t. This results in a pre-arcing I²t of 33,180 A²s and a clearing I²t of 150,000 A²s at rated voltage, ensuring precise fault clearance and reduced energy let-through. The fuse boasts a high interrupting capacity of 200 kA, safeguarding against severe short-circuit events. All contact surfaces are silver-plated for superior electrical conductivity, and non-magnetic hardware is utilized to prevent interference in sensitive electronic circuits. The D330191 is compatible with DIN 80 blades and weighs 0.24 kg. It is an ideal choice for small power conversion applications demanding high-speed, reliable protection.
  • Mersen Protistor® NH 000 size high-speed fuse-link
  • Rated 400A, 500VAC (IEC) / 700VAC (UL)
  • Ultra-fast semiconductor protection for diodes, thyristors, IGBTs
  • 200 kA interrupting capacity
  • Pre-arcing I²t: 33,180 A²s, Clearing I²t: 150,000 A²s

Specifications

AC Voltage Rating
500 V
Amperage Rating
400 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
DIN Type Blades
Mounting
Bolted
Size
3.94 x 0.79 x 1.52 in
Size
100 x 20 x 38.5 mm
Special Features
aR Class according to IEC 60269-4 and VDE 636-23 Very low I²t for improved semiconductor protection Ultra fast acting Superior cycling capability
Standard
IEC 60269-4 Compliance UL/CSA Recognized Component AC: UL Guide No. E76491
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links AC Protection
Voltage Rating
500 V
Wattage
66 W
Package Dimensions (L x W x H)
3.94 in x 0.79 in x 1.52 in
Package Dimensions (L x W x H)
100 mm x 20 mm x 38.5 mm
Package Weight (Imperial)
0.291 lb
Package Weight (Metric)
0.132 kg
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9F61 Size B Clips 1.6in

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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.

LCC5

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.

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.