Merit Brass A4J30 Class J Fuse 600V 10 Pack

Product Description

The MERIT BRASS A4J30 is a Class J current-limiting fuse rated at 600 volts, designed for overcurrent protection in industrial and commercial electrical distribution systems. Class J fuses are known for their high interrupting capacity and compact form factor, making them a reliable choice for protecting motor branch circuits, feeders, and panel boards where space and fault-current performance are critical. Licensed electricians typically install this fuse in fusible disconnects, combination starters, and distribution panelboards. The A4J30 ships in a pack of 10, supporting service inventory and multi-circuit installations.

This fuse is suited for commercial and industrial applications where 600-volt Class J protection is required. Typical install scenarios include motor control centers, industrial machinery branch circuits, and service entrance equipment. The compact Class J blade-style form factor fits standard Class J fuseholders found across a wide range of disconnect switches and panelboards. This 10-pack format is practical for facilities maintenance teams and electrical contractors stocking service vans or job-site supply kits.

Key Features

• 600-volt rating suitable for industrial and commercial distribution systems
• Class J form factor with high interrupting capacity for fault-current protection
• Current-limiting design helps reduce arc flash energy during fault events
• Compact blade dimensions fit standard Class J fuseholders
• Sold in a 10-pack for multi-circuit or service-stock applications

Compatibility

Designed as an OEM-style replacement for standard Class J fuseholder applications in 600-volt commercial and industrial electrical distribution equipment.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). Always de-energize and lock out the circuit before removing or installing fuses. Verify the fuseholder is rated for Class J fuses and confirm the voltage and amperage ratings match the circuit requirements before installation. Do not install a fuse with a higher amperage rating than what the circuit is designed to carry.