Mersen A4BT650 - Fuse A4BT - Class L - Time-Delay 600VAC 500VDC 650A Blade Amp-Trap®
Mersen

A4BT650

Alternate Item Number: A4BT650

UPC: 782001939878


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Overview

The Mersen A4BT650 (SKU: A4BT650) is a Class L time-delay fuse designed for robust current-limiting protection in industrial electrical systems. Rated for 600VAC and 500VDC, this 650A fuse is engineered for mains, feeder, and general circuit protection. Its key feature is a 10-second time-delay at 500% of its rated current, which effectively accommodates high inrush loads from large motors, transformers, and other inductive equipment without causing nuisance tripping. The A4BT650 allows for 100% continuous current rating, enabling full utilization of protected equipment under normal operating conditions. Mersen's Amp-Trap® technology ensures high interrupting ratings (200kA AC, 100kA DC), significantly minimizing arc flash risks and reducing potential downtime during fault events. Manufactured in France, this fuse is compatible with standard Class L fuse holders and panels. Its glass melamine body and plated terminals offer superior reliability in harsh environments, with blade-stamped catalog numbers for permanent identification. The A4BT650 is UL Listed to standard 248-10 and CSA Certified to standard C22.2 No. 248.10, with self-certification for DC applications per UL248.
  • Class L Time-Delay Fuse with 10-second delay at 500% rated current
  • 650A, 600VAC / 500VDC ratings
  • 200kA AC / 100kA DC Interrupting Rating
  • Amp-Trap® current-limiting technology
  • UL Listed and CSA Certified for reliable protection

Specifications

AC Voltage Rating
600 V
Amperage Rating
650 A
Application
Motors Motor controllers Transformers Mains Feeders
Body Material
GMG
Brand Name
Mersen
Class
Class L
Connection
Blade
Connection Material
Silver-Plated Copper
Connection Type
Blade
Current Rating
650A
Interrupt Rating
200 kA
Mounting
Bolted
Nema Rating
Class L
Series
A4BT
Size
8.63 x 3 in
Size
219.202 x 76.2 mm
Size
8.63 x 3;219.202 x 76.2 in;mm
Special Features
Unique dimensions prevent replacement by other fuse classes. Blade-stamped catalog numbers for permanent identification Glass melamine body and plated terminals provide superior reliability in harsh environments
Standard
UL Listed to Standard 248-10, File E2137 CSA Certified to Standard C22.2, No. 248.68 Self-certified for DC per UL248 (601-2000)
Sub Brand
Amp-Trap®
Type
Class L
Voltage Rating
600VAC 500VDC
Voltage Rating
600VAC/500VDC
Voltage Rating
600 VAC
Voltage Rating
600VAC / 500VDC
Package Dimensions (L x W x H)
8.63 in x 3 in x 3 in
Package Dimensions (L x W x H)
219.202 mm x 76.2 mm x 76.2 mm
Package Weight (Imperial)
3.730 lb
Package Weight (Metric)
1.692 kg
Fuse A4BT - Class L - Time-Delay 600VAC 500VDC 601A Blade Amp-Trap®

A4BT601

Fuse A4BT - Class L - Time-Delay 600VAC 500VDC 601A Blade Amp-Trap®

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.