Mersen A4J125 Fuse A4J - Class J - Fast-Acting 600VAC 300VDC 125A Blade Amp-Trap®
Alternate Item Number: A4J125
UPC: 782001960346
Documents & Media
Contact for Pricing
Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.
Overview
- Fast-acting current-limiting protection for industrial systems
- Rated 600VAC / 300VDC with 200kA AC and 100kA DC interrupting capacity
- Fiberglass body for dimensional stability in harsh environments
- Unique dimensions prevent substitution with lower-rated fuses
- Easy-to-read imprint label for quick identification and replacement
Specifications
AC Voltage Rating | 600 V |
Amperage Rating | 125 A |
Application | Capacitors Load centers Panelboards Switchboards Bus duct Feeder circuits Circuit breakers Lighting, heating, and general loads |
Body Material | GMG |
Brand Name | Mersen |
Class | Class J |
Connection | Blade |
Connection Material | Brass Alloy |
DC Voltage Rating | 300 V |
Fuse Class | J |
Interrupt Rating | 200 kA |
Mounting | Clip |
Size | 5.75 x 1.62 in |
Size | 146.05 x 41.275 mm |
Special Features | High current limitation for low peak let-thru current Unique dimensions prevent replacement by other fuse classes Fiberglass body provides dimensional stability in harsh industrial environments Easy-to-read imprint label for quick recognition and replacement |
Standard | UL listed to standard 248-8 File E2137 CSA certified to standard C22.2 no. 248.8 DC listed to UL 248 IEC 269-2-1 |
Sub Brand | Amp-Trap® |
Type | Class J |
Voltage Rating | 600 VAC |
Package Dimensions (L x W x H) | 5.75 in x 1.62 in x 1.62 in |
Package Dimensions (L x W x H) | 146.05 mm x 41.275 mm x 41.275 mm |
Package Weight (Imperial) | 0.754 lb |
Package Weight (Metric) | 0.342 kg |
GPM-SRR90
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
C331156
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
LCC5
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
What are the voltage ratings for A4J Class J fuses?
A4J Class J fuses have voltage ratings of 600VAC and 300VDC.
What is the ampere range for A4J Class J fuses?
These fuses are available in ampere ratings from 1 to 600A.
What are the interrupting ratings (IR) for these fuses?
The interrupting ratings are 200kA I.R. AC and 100kA I.R. DC.
What are the UL and CSA certifications for these fuses?
They are UL listed to standard 248-8 (File E2137) and CSA certified to standard C22.2 no. 248.8.
What makes A4J Class J fuses unique in their application?
Their unique dimensions prevent substitution with lower-rated fuses, ensuring proper protection.
What type of protection do A4J Class J fuses provide?
They provide excellent current-limiting protection with low peak let-thru current.
What material is the body of the A4J fuse made from?
The fiberglass body provides dimensional stability in harsh industrial environments.
Are A4J Class J fuses fast-acting or time-delay?
A4J Class J fuses are fast-acting and very current-limiting.
What are some common applications for A4J Class J fuses?
Applications include capacitors, load centers, panelboards, switchboards, and feeder circuits.
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.