Mersen D300245 - Square Body High-Speed Fuse Protistor® Size 33 aR 690VAC IEC 700VAC UL 1100A With Striker Slotted Blades short
Mersen

D300245

Alternate Item Number: A070UD33KI1100


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Overview

The Mersen D300245 Protistor® square body high-speed fuse-link (SKU: D300245) is engineered for critical semiconductor protection in industrial applications. This aR (ultra-fast acting) fuse is designed to safeguard sensitive power electronic components such as diodes, thyristors, and IGBTs from overcurrents and short circuits. It boasts a substantial 1100A rated current and operates at 690VAC according to IEC standards and 700VAC according to UL standards. The fuse features a robust square body construction with slotted blades, facilitating flexible equipment design and mounting. Internally, Mersen utilizes die-cut elements embedded in solidified sand to precisely control arcing characteristics, resulting in a low I²t value and a high interrupting rating of 200 kA. All contact surfaces are silver-plated, and non-magnetic hardware is employed to ensure optimal performance and longevity. The D300245 is manufactured in the USA and can be optionally equipped with a low-voltage trip-indicator that activates a field-mountable microswitch for visual indication of fuse operation. Key specifications include a pre-arcing I²t of 240 kA²s and a clearing I²t at rated voltage of 1390 kA²s. The power dissipation at rated current is 160W, and it weighs approximately 0.88 kg. This fuse is part of Mersen's Protistor® series, known for its reliability in protecting high-power semiconductor devices.
  • Mersen Protistor® series for semiconductor protection
  • 1100A rated current, 690VAC (IEC) / 700VAC (UL) voltage rating
  • aR (ultra-fast acting) for sensitive device protection
  • Square body with slotted blades for flexible mounting
  • 200 kA interrupting capacity with low I²t for superior protection

Specifications

AC Voltage Rating
700 V
Amperage Rating
1100 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
Slotted Blades
Connection Type
Slotted Blades
Current Rating
1100A
Current Rating
1100 A
Material
Silver-plated, Die-cut elements in solidified sand
Material
Silver-plated contact surfaces, non-magnetic hardware, die-cut elements in solidified sand
Material
Silver-plated, non-magnetic hardware
Mounting
Bolted
Mounting Type
Multiple worldwide mounting styles
Mounting Type
Square Body
Series
Protistor®
Size
5.28 x 2.87 x 3.09 in
Size
134 x 73 x 78.5 mm
Size
Size 33
Special Features
Multiple body sizes and terminals or blades combination aR Class according to IEC 60269-4 and VDE 636-23 Very low I²t for improved semiconductor protection Ultra fast acting Current limiting Superior cycling capability
Standard
IEC 60269-4 Compliance UL/CSA Recognized E76491 CCC GB 13539.4 for Asian market only
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links AC Protection
Type Of Indicators
Striker
Voltage Rating
690/700 VAC
Voltage Rating
690 VAC (IEC) / 700 VAC (UL)
Voltage Rating
700 V
Voltage Rating
690VAC (IEC) and 700VAC (UL)
Wattage
160 W
Package Dimensions (L x W x H)
5.28 in x 2.87 in x 3.09 in
Package Dimensions (L x W x H)
134 mm x 73 mm x 78.5 mm
Package Weight (Imperial)
1.863 lb
Package Weight (Metric)
0.845 kg
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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.