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.

WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.