Merit Brass A4J80 Class J Fuse 600V 5 Pack

Product Description

The MERIT BRASS A4J80 is a Class J current-limiting fuse rated at 600 volts, designed for branch-circuit and feeder protection in commercial and industrial electrical systems. Class J fuses are recognized for their ability to limit fault-current energy and interrupt high available fault currents, providing a higher level of protection than standard Class K or H fuses. This SKU is packaged in a quantity of 5, making it a practical choice for stocking service vehicles or completing panel work requiring multiple fuse replacements. Licensed electricians and electrical contractors are the primary installers of this component.

Class J fuses are used in a wide range of applications including motor branch circuits, feeder panels, disconnect switches, and combination motor starters in light commercial and industrial facilities. Their compact dimensions and defined interrupt rating make them a common specification on engineered electrical drawings where fault-current coordination is required. This 5-pack configuration suits contractors servicing multiple circuits or maintaining spare inventory on site.

Key Features

• Class J current-limiting fuse rated at 600 volts for branch-circuit and feeder protection
• High interrupting capacity suitable for applications with elevated available fault current
• Packaged in a quantity of 5 per pack for efficient stocking and multi-circuit jobs
• Compact form factor consistent with Class J fuse dimensions and rejection feature

Compatibility

Designed as an OEM-style replacement for Class J fuse holders and disconnect switches rated for 600-volt Class J fuses. No specific model compatibility was provided in the product data.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit before replacing a fuse. Verify that the fuse holder or disconnect is rated for Class J fuses and that the replacement ampere rating matches the original circuit design. Do not substitute a fuse of a different class or higher ampere rating.

Technical Specifications

• Voltage Rating: 600 volts
• Fuse Class: Class J
• Quantity per Pack: 5
• Package Dimensions (L x W x H): 6.000 inches x 5.380 inches x 1.060 inches
• Weight: 0.240 pounds
• UPC: 78200196030

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A4J80