Ferraz Shawmut A4J200 Class J Fast-acting Fuse 200A

Product Description

The FERRAZ SHAWMUT A4J200 is a Class J fast-acting cylindrical fuse rated at 200 amps, designed for high-performance electrical circuit protection in demanding commercial and industrial applications. Built with a fiberglass and polyester body construction, this fuse delivers an interrupting rating of 200 kA at AC and 100 kA at DC, providing robust overcurrent protection where fault currents can be severe. Licensed electricians and industrial maintenance technicians install this fuse in panelboards, disconnect switches, and motor control centers where Class J form factor and fast-acting response are required by the system design.

This fuse is suited for commercial and industrial electrical systems requiring Class J fuse protection. Its fast-acting characteristic makes it appropriate for resistive loads and equipment where time-delay characteristics are not needed. The cylindrical body measures 41.3 mm in diameter, conforming to Class J dimensional standards. It is commonly installed in fusible disconnect switches, combination motor starters, and branch circuit protection assemblies in facilities with high available fault current.

Key Features

• 200A continuous current rating for high-ampacity branch and feeder circuit protection
• 200 kA AC interrupting rating for use in systems with high available fault current
• 100 kA DC interrupting rating for DC bus and drive protection applications
• Fast-acting response characteristic for precise overcurrent protection
• Fiberglass and polyester body construction for durability and arc containment
• Class J cylindrical form factor at 41.3 mm diameter

Compatibility

Designed as an OEM-style replacement for Class J cylindrical fuse holders and fusible disconnect switches rated for 200A Class J fuses.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit before removing or installing the fuse. Verify that the fuse holder and disconnect switch are rated for Class J fuses at the required voltage and ampacity before installation. Do not substitute a fuse of a different class, amperage, or interrupting rating for this fuse.