Mersen D70QS300-4 DC Round Body Fuse 700VDC UL 300A Max.Bolted
Alternate Item Number: D70QS300-4
UPC: 782001509026
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Overview
- 700V AC/DC rated
- 300A current rating
- Very low I²t for improved protection
- Superior cycling ability for long, reliable life
- Low watts loss for cooler operation
- Bolted connection type
- Tested to UL standard 198L parameters (DC)
Specifications
Amperage Rating | 300 A |
Application | High Power battery charging and management systems protection Energy Storage Systems (ESS) Electrical Energy Storage (EES) Battery Disconnect Unit (BDU) Battery pack protection DC Fast-Charging station for EV applications Backup protection for DC relay/disconnector/switch Protection of 700VDC or less, UPS and inverters |
Body Material | GMG |
Brand Name | Mersen |
Connection | Blade |
Connection Material | Tin-Plated Copper |
Connection Type | Bolted |
Current Rating | 300A |
DC Voltage Rating | 700 V |
Mounting | Bolted |
Series | D70QS |
Size | 4.34 x 1.5 in |
Size | 110.236 x 38.1 mm |
Special Features | Lower I²t performance for improved protection of equipment Superior cycling ability for long, reliable life on high cyclic loading Low watts losses High Interrupting rating for optimal short circuit protection |
Special Features | Lower I²t performance for improved protection of equipment Superior cycling ability for long, reliable life on high cyclic loading Low watts losses Built to withstand vibration High Interrupting rating for optimal short circuit protection |
Standard | UL Recognized: UL File: E60314 DC: 50-600A, 700VDC REACH/RoHS compliant |
Standard | UL Recognized: UL File: E60314 DC: 50-600A, 700VDC Power Cycling & Vibration REACH/RoHS compliant |
Type | Round Body High-Speed Fuse-Links DC Protection |
Voltage Rating | 700VDC |
Package Dimensions (L x W x H) | 4.34 in x 1.5 in x 1.5 in |
Package Dimensions (L x W x H) | 110.236 mm x 38.1 mm x 38.1 mm |
Package Weight (Imperial) | 0.680 lb |
Package Weight (Metric) | 0.308 kg |
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Frequently Asked Questions
What is the minimum breaking capacity (MBC) for D70QS300-4?
The minimum breaking capacity for the D70QS300-4 is 1580A.
What is the weight of the D70QS300-4 fuse?
The D70QS300-4 fuse weighs 0.26 kg.
What is the maximum time to clear the MBC for D70QS300-4?
The maximum time to clear the minimum breaking capacity for D70QS300-4 is 140 ms.
What is the power dissipation for D70QS300-4 at 0.5 In?
The power dissipation for D70QS300-4 at 0.5 In is 8.8 W.
What is the rated current (In) for the D70QS300-4 fuse?
The rated current (In) for the D70QS300-4 fuse is 300A.
What is the voltage rating for the D70QS series fuses?
The D70QS series fuses have a DC voltage rating of 700VDC.
What is the current interrupting capacity for D70QS fuses?
The DC current interrupting capacity (CI) is 20kA.
What is the time constant for the D70QS series fuses?
The time constant (L/R) for the D70QS series fuses is less than or equal to 1ms.
What are the applications for the D70QS series fuses?
They are used for high-power conversion applications, battery management and charging systems, and EV DC fast charging stations.
Which fuse holder is compatible with D70QS300-4 fuses?
The P243C fuse holder is compatible with D70QS fuses from 225A to 600A.
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.