Mersen A2D350R - Fuse A2D-R - Class RK1 - Time-Delay 250VAC 250VDC 350A Blade SmartSpot® Amp-Trap 2000®
Mersen

A2D350R

Alternate Item Number: A2D350R

UPC: 782001991142


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Overview

The Mersen Amp-Trap 2000® A2D-R fuse (SKU: A2D350R) offers robust IEC Type 2 "no damage" protection for mains, feeders, and branch circuits. Designed for industrial applications, this Class RK1, time-delay fuse provides essential protection for motor and non-motor loads. Its fast-acting response under extreme fault conditions safeguards motor starters, switches, and other circuit components from damage, while its time-delay characteristic effectively manages motor in-rush currents without nuisance tripping. This fuse is rated for 250VAC/DC with a 350A current rating and a 200kA interrupting rating (AC). Key features include a solid-state SmartSpot® visual blown fuse indicator for easy identification and a rejection-style design to prevent improper replacements when used with recommended fuse blocks. The A2D-R series is UL listed to standard 248-12 (File E2137) and CSA certified to standard C22.2 No. 248.12. It is an ideal upgrade for older 250V Class H, K, or RK5 fuses, offering enhanced protection and reduced inventory needs. The fiberglass body ensures dimensional stability in demanding industrial environments, and metal-embossed date and catalog numbers provide lasting traceability.
  • IEC Type 2 "no damage" protection for mains, feeders, and branch circuits
  • Time-delay for motor starting and transformer inrush currents
  • SmartSpot® visual blown fuse indicator for quick identification
  • 250VAC/DC, 350A rating with 200kA interrupting rating (AC)
  • UL listed to standard 248-12 and CSA certified

Specifications

AC Voltage Rating
250 V
Amperage Rating
350 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
Connection
Blade
Connection Material
Tin-Plated Copper
Connection Type
Blade
Current Rating
350A
Interrupt Rating
200 kA
Mounting
Clip
Nema Rating
Class RK1
Series
Amp-Trap 2000
Size
8.63 x 2.06 in
Size
219.202 x 52.324 mm
Size
8.63 x 2.06;219.202 x 52.324 in;mm
Special Features
Non-indicating or Solid state SmartSpot visual blown fuse indicator 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 class RK5, K, and H fuses Metal-embossed date and catalog number for easier traceability and lasting identification Fiberglass body provides dimensional stability in harsh industrial settings
Standard
UL listed to standard 248-12 File E2137 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
250VAC 250VDC
Voltage Rating
250 VAC
Package Dimensions (L x W x H)
8.63 in x 2.06 in x 2.06 in
Package Dimensions (L x W x H)
219.202 mm x 52.324 mm x 52.324 mm
Package Weight (Imperial)
1.640 lb
Package Weight (Metric)
0.744 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.