Mersen A6D175/400R - Reducer Fuse A6D-R - Class RK1 - Time-Delay 600VAC 600VDC 175A Blade SmartSpot® Amp-Trap 2000®
Mersen

A6D175/400R

Alternate Item Number: A6D175/400R

UPC: 782001489496


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Overview

The Mersen A6D175/400R Reducer Fuse (SKU: A6D175/400R) is a UL Listed Class RK1 fuse engineered for permanent current rating reduction without temporary fuse reducers. Rated at 600V AC/DC and 175A, it fits larger 400A fuse blocks while maintaining the same protective performance as standard A6D-R Class RK1 fuses. The SmartSpot® Amp-Trap 2000® technology provides visual and tactile fault indication, enabling quick identification of blown fuses. Unlike temporary reducers, this permanent solution eliminates the risk of mismatched ratings or accidental removal. Ideal for retrofitting existing systems where higher-rated fuses are present but lower current protection is required. Compatible with standard Class RK1 fuse holders and meets UL 248-15 standards for time-delay fuses. The 400A body size accommodates reduced ratings while preserving coordination with downstream protective devices. This fuse is specifically designed for applications requiring precise current limiting and reliable fault protection in industrial, commercial, and utility settings. The Class RK1 classification ensures compliance with stringent safety and performance requirements, including high interrupting ratings and consistent time-delay characteristics. The permanent design reduces maintenance needs and prevents unauthorized changes to fuse ratings, enhancing system reliability and safety.
  • UL Listed Class RK1 fuse for permanent current rating reduction
  • Rated 600V AC/DC and 175A with 400A body size
  • SmartSpot® Amp-Trap 2000® technology for visual/tactile fault indication
  • Time-delay design meets UL 248-15 standards
  • Compatible with standard Class RK1 fuse holders

Specifications

AC Voltage Rating
600 V
Amperage Rating
175 A
Application
Motors Safety switches Transformers Branch circuit protection Disconnects Control panels All general-purpose circuits
Body Material
PolyTube
Brand Name
Mersen
Class
Class RK1
Color
Red
Connection
Blade
Connection Material
Tin-Plated Copper
Connection Type
Blade
Current Rating
175A
Interrupt Rating
200 kA
Mounting
Clip
Nema Rating
Class RK1
Series
A6D-R Class RK1
Series
Amp-Trap 2000® A6D-R
Series
A6D-R
Series
SmartSpot® Amp-Trap 2000
Series
Amp-Trap 2000®
Size
11.63 x 2.56;295.402 x 65.024 in;mm
Size
11.63 x 2.56 in
Size
295.402 x 65.024 mm
Size
400A
Size
400A body size
Special Features
Replaces traditional temporary-use only Fuse Reducer accessories Time-delay for motor starting and transformer inrush currents without nuisance opening 600VAC & 600VDC dual rated 300kA interrupting rating - self-certified, UL witnessed tests Extremely current-limiting for low peak let-thru current Recommended for Arc Flash energy reduction Easy 2-to-1 selectivity for prevention of nuisance shut downs and “black outs” Rejection-style design prevents replacement errors (when used with recommended fuse blocks) High-visibility orange label gives instant brand recognition Reduced inventory by taking the place of lower-rated Class RK1 fuses and associated Fuse Reducer accessories Metal-embossed date and catalog number for easier traceability and lasting identification Fiberglass body provides dimensional stability in harsh industrial settings
Standard
UL Special Purpose Listed to 248-12 DC listed to UL standard 248 CSA certified to standard C22.2 No. 248.12
Sub Brand
Amp-Trap 2000®
Type
Class RK1
Type Of Indicators
SmartSpot®
Voltage Rating
600VAC/600VDC
Voltage Rating
600VAC 600VDC
Package Dimensions (L x W x H)
11.63 in x 2.56 in x 2.56 in
Package Dimensions (L x W x H)
295.402 mm x 65.024 mm x 65.024 mm
Package Weight (Imperial)
3.400 lb
Package Weight (Metric)
1.542 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.