Mersen C300704 - Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 550A With Striker Slotted Blades long
Mersen

C300704

Alternate Item Number: A070UD31LI550


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Overview

The Mersen C300704 Protistor® Square Body High-Speed Fuse (SKU: C300704) is a Type aR ultra-fast acting fuse-link designed for semiconductor protection in power conversion equipment. Rated at 550A with 690VAC (IEC) / 700VAC (UL) compliance, this Size 31 fuse-link delivers exceptional interrupting capacity of 200kA and ultra-low I²t values (52,000 A²s pre-arcing / 310,000 A²s clearing). Engineered for IGBT, diode, and thyristor protection, the C300704 features silver-plated contact surfaces and non-magnetic hardware for enhanced reliability. The square body design with long slotted blades ensures compatibility with international mounting standards, while the optional striker mechanism enables remote indication via microswitch activation. With a power dissipation of 75W at rated current and a compact 0.42kg package, this fuse-link optimizes space in high-performance power electronics. Certified for global markets, the C300704 is ideal for solar inverters, motor drives, UPS systems, and industrial power conversion applications requiring precise semiconductor protection.
  • Rated current: 550A with 690VAC (IEC) / 700VAC (UL) compliance
  • Ultra-fast acting aR fuse-link for semiconductor protection (IGBT, diodes, thyristors)
  • Interrupting capacity: 200kA with pre-arcing I²t 52,000 A²s and clearing I²t 310,000 A²s
  • Square body design with long slotted blades for international mounting compatibility
  • Silver-plated contacts, non-magnetic hardware, and optional striker mechanism

Specifications

AC Voltage Rating
700 V
Amperage Rating
550 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
Slotted Blades
Mounting
Bolted
Size
5.85 x 2.01 x 2.22 in
Size
148.6 x 51 x 56.5 mm
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
700 V
Wattage
75 W
Package Dimensions (L x W x H)
5.85 in x 2.01 in x 2.22 in
Package Dimensions (L x W x H)
148.6 mm x 51 mm x 56.5 mm
Package Weight (Imperial)
0.920 lb
Package Weight (Metric)
0.417 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.