Mersen A6Y300-21 - Fuse A6Y 600VAC 500VDC 300A Type 21 Blade Amp-Trap®
Mersen

A6Y300-21

Alternate Item Number: A6Y300-21

UPC: 782001909468


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Overview

The Mersen A6Y300-21 is a Type 21 Amp-Trap® fuse, a foundational component in current-limiting fuse technology. As the original current-limiting fuse, it predates many industry standards, offering reliable protection. This specific model is rated for 600 Volts AC and 500 Volts DC, with a substantial 300 Ampere rating. The 500V DC capability, available through 600A in the Form 600 series, makes it suitable for specialized DC fusing applications where standard AC fuses may not suffice. Mersen Form 600 fuses deliver a high degree of current limitation, crucial for safeguarding equipment in both AC and DC circuits. Types 1 and 3 within this series are dimensionally interchangeable with Class H and Class K fuses, facilitating straightforward upgrades or replacements in existing systems. However, Types 4 and 5 feature unique rejection dimensions and are not interchangeable with other fuse classes. Manufactured in the USA, the A6Y300-21 (SKU: A6Y300-21) from Mersen provides robust overcurrent protection where precise current limitation is paramount. Its design ensures rapid interruption of fault currents, minimizing damage to sensitive electrical equipment and preventing cascading failures. This fuse is an essential choice for applications requiring dependable and effective overcurrent protection with specific voltage and current requirements.
  • Mersen Amp-Trap® Type 21 Fuse
  • 600VAC / 500VDC Voltage Rating
  • 300 Ampere Current Rating
  • High Current Limitation Capability
  • Original Current-Limiting Fuse Design

Specifications

AC Voltage Rating
600 V
Amperage Rating
300 A
Body Material
GMG
Brand Name
Mersen
Connection
Blade
Connection Material
Silver-Plated Copper
Connection Type
Blade
Current Rating
300 A
DC Voltage Rating
500 V
Interrupt Rating
200 kA
Mounting
Clip
Series
Amp-Trap Form 600
Size
8.62 x 2 in
Size
218.948 x 50.8 mm
Size
Type 21
Standard
UL Recognized Component File E60314 DC Tested to UL248-1 (1-600A)
Sub Brand
Amp-Trap®
Type
DC Fuses
Voltage Rating
600 VAC / 500 VDC
Package Dimensions (L x W x H)
8.62 in x 2 in x 2 in
Package Dimensions (L x W x H)
218.948 mm x 50.8 mm x 50.8 mm
Package Weight (Imperial)
1.800 lb
Package Weight (Metric)
0.816 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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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.